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Bragg M, Muletz-Wolz CR, Songsasen N, Freeman EW. Kibble diet is associated with higher faecal glucocorticoid metabolite concentrations in zoo-managed red wolves ( Canis rufus). Conserv Physiol 2024; 12:coae008. [PMID: 38414659 PMCID: PMC10898788 DOI: 10.1093/conphys/coae008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/03/2024] [Accepted: 01/24/2024] [Indexed: 02/29/2024]
Abstract
The red wolf (Canis rufus) is a critically endangered canid that exists solely because of the establishment of the ex situ population in the late 1980s. Yet, the population under human care suffers from gastrointestinal (GI) disease in captivity. While the cause of GI disease is unknown, it is speculated that environmental factors can influence GI health of zoo-managed red wolves. The goal of the present study was to investigate the relationship between faecal glucocorticoid metabolite (FGM) concentrations, a biomarker for stress, and environmental factors for zoo-managed red wolves. Faecal samples were collected from 14 adult wolves three times a week for 5 to 12 months. Using a single-antibody cortisol enzyme immunoassay, FGM concentrations were quantified. Environmental factors were collected for each participating wolf on dietary type, sex, type of public access to enclosure, density (enclosure size [ft2]/number of wolves living in enclosure) and a monthly average status of GI health. Red wolves that ate a commercial kibble diet had both higher FGM concentrations over time and higher baseline FGM concentrations compared to individuals that received commercial kibble mixed with commercial meat. Density, public access or GI health were not related to FGM concentration; however, males had higher baseline FGM concentrations compared to female red wolves. Our findings suggest that management conditions, particularly diet, can strongly influence FGM concentration in the zoo-managed red wolf population. Findings from this study highlight the importance of management choices on individual welfare. Maintaining a healthy captive population of red wolves is imperative for the persistence of the species, including successful future reintroductions.
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Affiliation(s)
- Morgan Bragg
- Environmental Science and Policy Department, George Mason University, 4400 University Dr. Fairfax, VA 22030, USA
- Center for Conservation Genetics, Smithsonian National Zoo & Conservation Biology Institute, 3001 Connecticut Ave. NW Washington, DC, 20008 USA
- Center for Species Survival, Smithsonian National Zoo & Conservation Biology Institute, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Carly R Muletz-Wolz
- Center for Conservation Genetics, Smithsonian National Zoo & Conservation Biology Institute, 3001 Connecticut Ave. NW Washington, DC, 20008 USA
| | - Nucharin Songsasen
- Center for Species Survival, Smithsonian National Zoo & Conservation Biology Institute, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Elizabeth W Freeman
- School of Integrative Studies, George Mason University, 4400 University Dr. Fairfax, VA 22030, USA
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LaDue CA, Hunt KE, Kiso WK, Freeman EW. Hormonal variation and temporal dynamics of musth in Asian elephants ( Elephas maximus) are associated with age, body condition and the social environment. Conserv Physiol 2023; 11:coad019. [PMID: 38026805 PMCID: PMC10660383 DOI: 10.1093/conphys/coad019] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/23/2023] [Accepted: 03/27/2023] [Indexed: 12/01/2023]
Abstract
The sustainability of endangered Asian elephants in human care is threatened in part by low breeding success and concerns over individual animal wellbeing. Male elephants have received less research attention compared to females, yet males deserve special consideration due to their unique reproductive biology (particularly the sexual state of "musth") and the complex interaction of physiological, environmental, and social pressures they face. We measured fecal androgen metabolites (FAMs), fecal glucocorticoid metabolites (FGMs), and fecal triiodothyronine metabolites (FT3s) collected weekly over approximately 12 months from 26 male Asian elephants housed in zoos across the US, hypothesizing that FAM, FGM, and FT3 concentrations would be associated with temporal correlates of musth and would vary further with intrinsic (musth status, age, body condition) and extrinsic (social environment) factors. The duration of each musth episode was positively associated with exposure to male conspecifics and negatively associated with body condition. Further, elevated FAM concentrations were associated with social exposure, age, and body condition, and FGM concentrations also varied with age and body condition. FT3 concentrations were not associated with any factor we measured. We also identified periods of lower FAM concentration than confirmed musth episodes (but still higher than baseline FAM concentrations) that we termed "elevated FAM episodes." The durations of these episodes were negatively correlated with exposure to other male elephants. Together, these results provide evidence that hormone profiles (including those that are predicted to change around musth) vary significantly between male Asian elephants in a way that may be attributed to intrinsic and extrinsic factors. Studies like these serve to enhance the sustainability of ex-situ populations by providing wildlife managers with information to enhance the health, welfare, and reproduction of threatened species like Asian elephants.
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Affiliation(s)
- Chase A LaDue
- Department of Environmental Science and Policy, 4400 University Drive, MSN 5F2, George Mason University, Fairfax, VA 22030, USA
- Oklahoma City Zoo and Botanical Garden, 2000 Remington Place, Oklahoma City, OK 73111, USA
| | - Kathleen E Hunt
- Department of Biology, George Mason University, 10900 University Boulevard, Manassas, VA 20110, USA
- Smithsonian-Mason School of Conservation, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Wendy K Kiso
- White Oak Conservation Foundation, 581705 White Oak Road, Yulee, FL 32097, USA
- Colossal Biosciences, 3309 Elm Street, Dallas, TX 75226, USA
| | - Elizabeth W Freeman
- School of Integrative Studies, 4400 University Drive, MSN 5D3, George Mason University, Fairfax, VA 22030, USA
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Pennington PM, Splan RK, Jacobs RD, Wang Y, Wagner AL, Freeman EW, Pukazhenthi BS. Influence of Reproductive Status on Equine Serum Proteome: Preliminary Results. J Equine Vet Sci 2021; 105:103724. [PMID: 34607689 DOI: 10.1016/j.jevs.2021.103724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/26/2021] [Accepted: 07/28/2021] [Indexed: 10/20/2022]
Abstract
The reproductive cycle and early pregnancy represent dynamic physiological states in mammals, but mechanisms involved in early pregnancy in the domestic horse remain poorly understood. Proteins in uterine secretions have been studied, but the proteome of peripheral serum during various reproductive states has not been investigated. This study characterized and compared the serum proteome in the domestic horse during various reproductive states. Serum was collected from three mares during: (1) estrus (day [d] -1; d 0 = ovulation), (2) diestrus (d 12.5, non-mated), (3) early pregnancy (d 12.5, pregnant), and (4) nonpregnant (d 12.5, unsuccessfully mated) states. Serum proteins in each sample were analyzed by Nano LC-MS/MS, and 308 proteins were identified. Differentially-expressed proteins (DEP; > 1.5-fold or < - 0.5-fold) were identified by comparison of protein relative abundance between reproductive states: (1) diestrus compared to estrus (DEP = 71), (2) pregnant compared to diestrus (DEP = 72), and (3) non-pregnant compared to pregnant (DEP = 81). DEPs were analyzed for biological function using PANTHER (pantherdb.org). Several pregnancy-specific proteins previously identified in equine pregnant histotroph, including Apolipoprotein A-I, Complement C3, and Histone H4, were detectable in the serum. The ability to detect these biomarkers in serum provides a more readily available option for investigating and understanding early equine pregnancy.
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Affiliation(s)
- Parker M Pennington
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA; George Mason University, Fairfax, VA
| | - Rebecca K Splan
- Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Robert D Jacobs
- Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Yan Wang
- Proteomics Core Facility, College of Computer, Mathematical, and Natural Sciences, University of Maryland, College Park, MD
| | | | | | - Budhan S Pukazhenthi
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA.
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LaDue CA, Schulte BA, Kiso WK, Freeman EW. Musth and sexual selection in elephants: a review of signalling properties and potential fitness consequences. BEHAVIOUR 2021. [DOI: 10.1163/1568539x-bja10120] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Sexual selection mediated by multimodal signals is common among polygynous species, including seasonally breeding mammals. Indirect benefit models provide plausible explanations for how and why mate selection can occur in the absence of direct benefits. Musth — an asynchronous reproductive state in male elephants — facilitates both inter- and intrasexual selection via indirect benefits, and it is further communicated through a multimodal signal. In this review, we synthesise existing evidence that supports the hypothesis that musth is a multimodal signal subject to sexual selection and that male elephants increase their direct fitness by propagating this signal while females accrue indirect benefits. Musth is characterised by a suite of physiological and behavioural changes, serving to facilitate copulation between the sexes, and via multisensory modalities musth conveys honest information about the condition of a male. Female elephants mate preferentially with musth males, increasing their own fitness in the absence of direct benefits. In addition, musth resolves dynamic dominance hierarchies among male elephants and often eliminates the need for costly physical combat. Future work in this field should investigate potential postcopulatory selection mechanisms in elephants, including sperm competition and cryptic female choice. These topics join other fundamental questions related to sexual selection, signalling, and indirect benefits that are still unanswered in elephants.
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Affiliation(s)
- Chase A. LaDue
- Department of Environmental Science and Policy, George Mason University, Fairfax, VA, USA
| | - Bruce A. Schulte
- Department of Biology, Western Kentucky University, Bowling Green, KY, USA
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Jones MK, Huff TB, Freeman EW, Songsasen N. Differential expression of urinary volatile organic compounds by sex, male reproductive status, and pairing status in the maned wolf (Chrysocyon brachyurus). PLoS One 2021; 16:e0256388. [PMID: 34415938 PMCID: PMC8378691 DOI: 10.1371/journal.pone.0256388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 08/05/2021] [Indexed: 11/18/2022] Open
Abstract
The maned wolf (Chrysocyon brachyurus) is an induced ovulator. Though the mechanism of ovulation induction remains unknown, it is suspected to be urinary chemical signals excreted by males. This study assessed volatile organic compounds (VOCs) in weekly urine samples across 5 months from 13 maned wolves (6 intact males, 1 neutered male, 6 females) with the goal of identifying VOCs that are differentially expressed across sex, reproductive status, and pairing status. Solid-phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS) were used to extract and separate VOCs that were identified via spectral matching with authentic standards, with spectral libraries, or with new software that further matches molecular fragment structures with mass spectral peaks. Two VOCs were present across all 317 urine samples: 2,5-dimethyl pyrazine and 2-methyl-6-(1-propenyl)-pyrazine. Fifteen VOCs differed significantly (Adj. P < 0.001 and |log2 fold change| >2.0) between intact males and females. Using partial least squares-discriminant analysis, the compounds with the highest importance to the sex classification were delta-decalactone, delta-dodecalactone, and bis(prenyl) sulfide. Sixty-two VOCs differed between intact males and the neutered male. Important classifier compounds were 3-ethyl 2,5-dimethyl pyrazine, 2-methyl-6-(1-propenyl)-pyrazine, and tetrahydro-2-isopentyl-5-propyl furan. Several VOCs established as important here have been implicated in reproductive communication in other mammals. This study is the most robust examination of differential expression in the maned wolf thus far and provides the most comprehensive analysis of maned wolf urinary VOCs to date, increasing the sample size substantially over previous chemical communication studies in this species. New data analysis software allowed for the identification of compounds in the hormone-producing mevalonate pathway which were previously unreported in maned wolf urine. Several putative semiochemicals were identified as good candidates for behavioral bioassays to determine their role in maned wolf reproduction, and specifically in ovulation induction.
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Affiliation(s)
- Marieke K. Jones
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, United States of America
- Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia, United States of America
| | - Thomas B. Huff
- Shared Research Instrumentation Facility, George Mason University, Manassas, Virginia, United States of America
| | - Elizabeth W. Freeman
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, United States of America
- School of Integrative Studies, George Mason University, Fairfax, Virginia, United States of America
| | - Nucharin Songsasen
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, United States of America
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LaDue CA, Vandercone RPG, Kiso WK, Freeman EW. Scars of human–elephant conflict: patterns inferred from field observations of Asian elephants in Sri Lanka. Wildl Res 2021. [DOI: 10.1071/wr20175] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract
ContextHuman–elephant conflict (HEC) is a major threat to Asian elephants as humans and elephants are forced to share common resources. In Sri Lanka, human-dominated landscapes adjacent to protected areas promote high rates of HEC, especially in the form of crop-foraging by elephants. Crop-foraging can be dangerous to both elephants and humans involved in the conflict. Gunfire is a common way for human communities to deter crop-foraging elephants, and gunshot wounds are commonly described in this elephant population on necropsy.
AimsWe sought to quantify and describe unique scar patterns among Asian elephants in a protected area, Wasgamuwa National Park, attributed to HEC.
MethodsWe identified 38 adult female and 64 adult male elephants and recorded the age class and body condition of each with established standards. Using photographs, we counted the number, position, and relative size of all scars on each animal.
Key resultsMale elephants had significantly more scars than did females, and for males, the number of scars increased progressively with age. Additionally, male elephants with higher body conditions had more scars. Finally, males tended to have more scars towards the head, especially at older ages.
ConclusionsDifferences in total scar counts between the sexes in this population imply that male elephants in this area more frequently engage in HEC than do females, following observations previously described in the literature. Furthermore, the fact that male elephants acquired progressively more scars as they aged, and that fatter elephants had more scars, indicates that previous exposure to HEC may not have been a deterrent for future events among these males, and potentially, crops served as valuable food sources for these animals. Finally, the changing body locations of these scars with age in males possibly shows plastic behavioural responses during crop-foraging or lower tolerance by farmers towards habitual crop foragers.
ImplicationsThese results emphasise the need for animal-based approaches to HEC mitigation. Similarly, conservation managers in Sri Lanka and other elephant range countries should investigate similar methods that estimate patterns of HEC to develop effective management strategies directly targeting animals most likely to engage in conflict.
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Bragg M, Freeman EW, Lim HC, Songsasen N, Muletz-Wolz CR. Gut Microbiomes Differ Among Dietary Types and Stool Consistency in the Captive Red Wolf ( Canis rufus). Front Microbiol 2020; 11:590212. [PMID: 33304337 PMCID: PMC7693430 DOI: 10.3389/fmicb.2020.590212] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/14/2020] [Indexed: 12/12/2022] Open
Abstract
Captive management of many wildlife species can be challenging, with individuals displaying health disorders that are not generally described in the wild population. Retrospective studies have identified gastrointestinal (GI) diseases, in particular inflammatory bowel disease (IBD), as the second leading cause of captive adult red wolf (Canis rufus) mortality. Recent molecular studies show that imbalanced gut microbial composition is tightly linked to IBD in the domestic dog. The goal of the present study was to address two main questions: (1) how do red wolf gut microbiomes differ between animals with loose stool consistency, indicative of GI issues, and those with normal stool consistency and (2) how does dietary type relate to stool consistency and red wolf gut microbiomes? Fresh fecal samples were collected from 48 captive wolves housed in eight facilities in the United States and from two wild wolves living in Alligator River National Wildlife Refuge, NC, United States. For each individual, the stool consistency was categorized as loose or normal using a standardized protocol and their diet was categorized as either wild, whole meat, a mix of whole meat and kibble or kibble. We characterized gut microbiome structure using 16S rRNA gene amplicon sequencing. We found that red wolves with a loose stool consistency differed in composition than wolves with normal stool consistency, suggesting a link between GI health and microbiome composition. Diet was not related to stool consistency but did significantly impact gut microbiome composition; gut microbiome composition of wolves fed a kibble diet were significantly different than the gut microbiome composition of wolves fed a mixed, whole meat and wild diet. Findings from this study increase the understanding of the interplay between diet and GI health in the red wolf, a critical piece of information needed to maintain a healthy red wolf population ex situ.
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Affiliation(s)
- Morgan Bragg
- Department of Environmental Science and Policy, George Mason University, Fairfax, VA, United States
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, United States
- Center for Conservation Genomics, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, United States
| | - Elizabeth W. Freeman
- School of Integrative Studies, George Mason University, Fairfax, VA, United States
| | - Haw Chuan Lim
- Department of Biology, George Mason University, Fairfax, VA, United States
| | - Nucharin Songsasen
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, United States
| | - Carly R. Muletz-Wolz
- Center for Conservation Genomics, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, United States
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Fazio JM, Barthel T, Freeman EW, Garlick-Ott K, Scholle A, Brown JL. Utilizing Camera Traps, Closed Circuit Cameras and Behavior Observation Software to Monitor Activity Budgets, Habitat Use, and Social Interactions of Zoo-Housed Asian Elephants ( Elephus maximus). Animals (Basel) 2020; 10:ani10112026. [PMID: 33153175 PMCID: PMC7692367 DOI: 10.3390/ani10112026] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/25/2020] [Accepted: 10/30/2020] [Indexed: 11/16/2022] Open
Abstract
Accredited zoos and aquariums value superior animal husbandry and strive to ensure that the physical, psychological, and social needs of animals are met. In North America, the Association of Zoos and Aquariums (AZA) relies on species-specific standards to ensure facilities provide the best care for collection animals. The AZA also makes explicit recommendations for long-term monitoring of welfare. Data collected through behavioral observations can be used to modify management as animals respond over time to social, environmental, or physical changes. In long-lived, social species like elephants, it is particularly important to document herd dynamics, calf development, geriatric health, and social bonds throughout their lifetimes. The Smithsonian's National Zoological Park housed one male and six female Asian elephants in dynamic social groupings. Behavioral observations were conducted on all elephants for two years using two methods involving ZooMonitor, closed circuit cameras, and camera traps. The goal was to compare how these two methods function to provide individual activity budgets, habitat use, and social interactions. Methodologies such as these, alone or in combination, have the potential to produce valuable data about potential changes in welfare over time in a zoological setting and can be performed either by staff or volunteers with high reliability.
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Affiliation(s)
- Jilian M. Fazio
- Department of Animal Programs, Animal Care Sciences, Smithsonian’s National Zoological Park, 3100 Connecticut Ave., Washington, DC 20013, USA; (T.B.); (K.G.-O.); (A.S.)
- Center for Species Survival, Smithsonian’s Conservation Biology Institute, 1500 Remount Rd., Front Royal, VA 22630, USA;
- Correspondence: ; Tel.: +1-(908)-447-6921
| | - Tony Barthel
- Department of Animal Programs, Animal Care Sciences, Smithsonian’s National Zoological Park, 3100 Connecticut Ave., Washington, DC 20013, USA; (T.B.); (K.G.-O.); (A.S.)
| | - Elizabeth W. Freeman
- School of Integrative Studies, George Mason University, 4400 University Dr, Fairfax, VA 22030, USA;
| | - Kay Garlick-Ott
- Department of Animal Programs, Animal Care Sciences, Smithsonian’s National Zoological Park, 3100 Connecticut Ave., Washington, DC 20013, USA; (T.B.); (K.G.-O.); (A.S.)
| | - Anne Scholle
- Department of Animal Programs, Animal Care Sciences, Smithsonian’s National Zoological Park, 3100 Connecticut Ave., Washington, DC 20013, USA; (T.B.); (K.G.-O.); (A.S.)
| | - Janine L. Brown
- Center for Species Survival, Smithsonian’s Conservation Biology Institute, 1500 Remount Rd., Front Royal, VA 22630, USA;
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Fazio JM, Freeman EW, Bauer E, Rockwood L, Brown JL, Hope K, Siegal-Willott J, Parsons ECM. Longitudinal fecal hormone monitoring of adrenocortical function in zoo housed fishing cats (Prionailurus viverrinus) during institutional transfers and breeding introductions. PLoS One 2020; 15:e0230239. [PMID: 32187226 PMCID: PMC7080239 DOI: 10.1371/journal.pone.0230239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 02/25/2020] [Indexed: 11/18/2022] Open
Abstract
The ex situ population of fishing cats (Prionailurus viverrinus) has become increasingly important for the conservation of this species. Unfortunately, captivity-induced stress is a concern and potential factor for lack of breeding success in this small felid, resulting in an unsustainable population. The objectives of this study were to: 1) validate an enzyme immunoassay for monitoring of fecal glucocorticoid metabolite (FGM) concentrations in the fishing cat; 2) identify potential exogenous stressors in the captive environment; 3) pinpoint management techniques that may lower FGM concentrations; and 4) determine if FGM concentrations are related to breeding success. Through a successful adrenocorticotrophic hormone challenge and additional laboratory methods, a cortisol enzyme immunoassay was validated as an effective tool for detecting FGM in this species. Between 2010 and 2013, longitudinal FGM monitoring was conducted in 26 fishing cats in the North American Species Survival Plan®. Exogenous stressors that elevated FGM concentrations included: chemical immobilizations; permanent transfers between facilities; construction; facility events; and fights/aggression among breeding pairs. Management factors that lowered FGM concentrations included: increased animal-keeper interaction through formal training; and providing indoor, off-exhibit, holding areas. In addition, social housing of individuals (either established breeding pairs or same sex pairs) decreased FGM concentrations. Individuals with breeding success (defined as observed copulations during the study period) also had lower FGM concentrations than unsuccessful individuals. Findings indicate that management factors play a role in lowering glucocorticoid (stress) levels in fishing cats, which may ultimately affect breeding success in the ex situ population.
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Affiliation(s)
- Jilian M. Fazio
- Center for Animal Care Sciences, Smithsonian’s National Zoological Park, Washington, District of Columbia, United States of America
- Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia, United States of America
- * E-mail:
| | - Elizabeth W. Freeman
- School of Integrative Studies, George Mason University, Fairfax, Virginia, United States of America
| | - Erika Bauer
- Center for Animal Care Sciences, Smithsonian’s National Zoological Park, Washington, District of Columbia, United States of America
| | - Larry Rockwood
- Department of Biology, George Mason University, Fairfax, Virginia, United States of America
| | - Janine L. Brown
- Center for Species Survival, Smithsonian’s Conservation Biology Institute, Front Royal, Virginia, United States of America
| | - Katharine Hope
- Center for Animal Care Sciences, Smithsonian’s National Zoological Park, Washington, District of Columbia, United States of America
| | - Jessica Siegal-Willott
- Center for Animal Care Sciences, Smithsonian’s National Zoological Park, Washington, District of Columbia, United States of America
| | - E. C. M. Parsons
- Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia, United States of America
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10
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Pennington PM, Splan RK, Jacobs RD, Chen Y, Singh RP, Li Y, Gucek M, Wagner AL, Freeman EW, Pukazhenthi BS. Influence of Metabolic Status and Diet on Early Pregnant Equine Histotroph Proteome: Preliminary Findings. J Equine Vet Sci 2020; 88:102938. [PMID: 32303306 DOI: 10.1016/j.jevs.2020.102938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 01/15/2020] [Accepted: 01/15/2020] [Indexed: 01/13/2023]
Abstract
Insulin resistance (IR) is characterized by an increase in biomarkers of systemic inflammation and susceptibility to laminitis in horses. Impacts on reproduction include a lengthened interovulatory period in horses. Dietary omega-3 (docosahexaenoic acid [DHA]) promotes anti-inflammatory processes, has been implicated in health benefits, and can reduce cytokine secretion. This preliminary study investigated the impact of IR as well as the influence of dietary supplementation (DHA) on the uterine fluid proteome in early pregnant horses. Mares were artificially inseminated; uterine fluid and embryos were collected on d 12.5 after ovulation. Uterine fluid was pooled for metabolic and diet categories (n = 8; n = 2 per metabolic and dietary status) and concentrated, and the proteome was analyzed using tandem mass spectrometry (iTRAQ). Five proteins met differential abundance criteria (±1.5-fold change, P < .05) in all comparisons (Control C, IS vs. C, IR; C, IS vs. DHA, IS; C, IR vs. DHA, IR). Serum amyloid A, afamin, and serotransferrin were upregulated in C, IR mares but downregulated in DHA, IR mares when compared to C, IS and C, IR, respectively. Quantitative PCR supported mass spectrometry results. The presence of serum amyloid A and serotransferrin in histotroph of IR mares potentially indicates an inflammatory response not seen in IS counterparts. These preliminary findings provide novel evidence on the potential impact of insulin resistance and DHA supplementation on the secreted equine uterine proteome during early pregnancy.
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Affiliation(s)
- Parker M Pennington
- Smithsonian Conservation Biology Institute, Center for Species Survival, Front Royal, VA; George Mason University, Fairfax, VA
| | - Rebecca K Splan
- Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Robert D Jacobs
- Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Yong Chen
- Proteomics Core Facility, Division of Intramural Research, NHLBI, Bethesda, MD
| | - Ram P Singh
- Smithsonian Conservation Biology Institute, Center for Species Survival, Front Royal, VA; Salim Ali Centre for Ornithology and Natural History, Coimbatore, Tamil Nadu, India
| | - Yue Li
- University of Maryland, College Park, MD
| | - Marjan Gucek
- Proteomics Core Facility, Division of Intramural Research, NHLBI, Bethesda, MD
| | | | | | - Budhan S Pukazhenthi
- Smithsonian Conservation Biology Institute, Center for Species Survival, Front Royal, VA; University of Maryland, College Park, MD.
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11
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Fazio JM, Freeman EW, Bauer E, Rockwood L, Parsons ECM. Evaluation of management in North American zoos to enhance breeding success of the fishing cat (Prionailurus viverrinus) ex situ population. Zoo Biol 2018; 38:189-199. [PMID: 30556919 DOI: 10.1002/zoo.21465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 09/12/2018] [Accepted: 11/13/2018] [Indexed: 11/08/2022]
Abstract
The ex situ population of fishing cats (Prionailurus viverrinus) face many challenges to its sustainability such as mate incompatibility, low founder numbers and disease prevalence. The North American population was monitored for a three-year period during institutional transfers and breeding introductions. In total, 26 fishing cats, including 15 different breeding pairs were monitored during 20 transfers. Most institutional transfers occurred in the fall months (September, October and November; 62%; n = 13) and males were transferred more often (62%; n = 13). Breeding success (observed copulations) was recorded in 33% (n = 5) of pairs but only 13% (n = 2 pairs) produced offspring during the study period. Institutions with successful breeding pairs had a greater number of indoor, off-exhibit enclosures (2.67 ± 0.29 enclosures; n = 5) compared to facilities with unsuccessful pairs (1.69 ± 0.25 exhibits; n = 6; p = 0.035). In addition, facilities housing successful pairs performed positive reinforcement training more frequently (14.77 ± 3.27 training days/month) than facilities with unsuccessful pairs (4.00 ± 2.73 days/month; p = 0.035). A binomial generalized linear model showed that friendly vocalizations (p = 0.000) during physical introductions of intended breeding pairs predicted copulation success. Introductions performed when a female was exhibiting estrous behavior (p = 0.020), was also predictive of copulation success. Results from this study are the first comprehensive analyses of captive management in the fishing cat. Environmental factors and management approaches are highlighted that could advance animal welfare and improve reproductive success in this species.
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Affiliation(s)
- Jilian M Fazio
- Smithsonian's National Zoo and Conservation Biology Institute, Animal Care Sciences, Washington, DC.,Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia
| | | | - Erika Bauer
- Smithsonian's National Zoo and Conservation Biology Institute, Animal Care Sciences, Washington, DC
| | - Larry Rockwood
- Department of Biology, George Mason University, Fairfax, Virginia
| | - Edward C M Parsons
- Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia
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Jones MK, Reiter LE, Gilmore MP, Freeman EW, Songsasen N. Physiological impacts of housing maned wolves (Chrysocyon brachyurus) with female relatives or unrelated males. Gen Comp Endocrinol 2018; 267:109-115. [PMID: 29913172 DOI: 10.1016/j.ygcen.2018.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 05/19/2018] [Accepted: 06/15/2018] [Indexed: 10/28/2022]
Abstract
The maned wolf is a threatened canid species native to South America. Previous studies have suggested the species exhibits induced ovulation. In captive breeding facilities, reproductive success is low while rates of neonatal mortality are high. Females that are not recommended for breeding are frequently housed together. However there has never been a systematic study of the reproductive consequences of co-housing females. This study was conducted for three purposes, to: (1) corroborate the presence of induced ovulation, (2) determine whether elevated cortisol is implicated in neonatal pup mortality, and (3) evaluate the endocrine correlates of group housed females. Using fecal hormone monitoring for estrogen, progesterone, and cortisol, 43 cycles from 33 female maned wolves were studied from 2002 to 2015. Females were categorized by their reproductive status: pregnant and successfully raised pups (PR; n = 11), pregnant with neonatal pup demise within 3 days (PL; n = 7), housed with a male but no signs of breeding or pregnancy (PP; n = 10), housed singly (S; n = 8), or housed with related females (F; n = 7). Estrogen and progestagen remained at baseline for all females not housed with a male (S, F), while elevations consistent with ovulation were seen in females housed with a male (PP, PL, PR). Compared to PR females, PL individuals showed similar cortisol levels throughout the cycle and slightly lower progesterone levels during gestation. As for the effect of co-housing related females, F females showed estrogen and progesterone levels lower even than S females while cortisol levels were elevated compared to all other groups. These findings support the previous evidence of induced ovulation in the maned wolf. Although elevated cortisol does not seem to be implicated in pup loss, a non-significant trend towards lower progesterone during gestation could be implicated. Future studies should assess depressed progesterone levels as a correlate to neonatal pup mortality. Female maned wolves housed with related females experience suppressed reproductive hormones and elevated adrenal hormones. Therefore, a more systematic study of hormonal and behavioral correlates to co-housing with related females is warranted.
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Affiliation(s)
- Marieke K Jones
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, United States; Department of Environmental Science and Policy, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States.
| | - Lauren E Reiter
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, United States; Interdisciplinary Studies, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States
| | - Michael P Gilmore
- School of Integrative Studies, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States.
| | - Elizabeth W Freeman
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, United States; School of Integrative Studies, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States.
| | - Nucharin Songsasen
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, United States.
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Depmann M, Eijkemans MJC, Broer SL, Tehrani FR, Solaymani-Dodaran M, Azizi F, Lambalk CB, Randolph JF, Harlow SD, Freeman EW, Sammel MD, Verschuren WMM, van der Schouw YT, Mol BW, Broekmans FJM. Does AMH relate to timing of menopause? Results of an Individual Patient Data meta- analysis. J Clin Endocrinol Metab 2018; 103:5055544. [PMID: 30032277 DOI: 10.1210/jc.2018-00724] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 07/13/2018] [Indexed: 02/13/2023]
Abstract
CONTEXT Anti-Müllerian hormone based (AMH) age at menopause predictions remain cumbersome due to predictive inaccuracy. OBJECTIVE To perform an Individual Patient Data (IPD) meta-analysis, regarding AMH based menopause prediction. DATA SOURCES A systematic literature search was performed using PubMed, Embase and Cochrane databases. STUDY SELECTION Prospective cohort studies regarding menopause prediction using serum AMH levels were selected by consensus discussion. DATA SELECTION Individual cases were included if experiencing a regular cycle at baseline. Exclusion criteria were hormone use and gynecological surgery. DATA SYNTHESIS 2596 women were included, 1077 experienced menopause. A multivariable Cox regression analysis assessed time to menopause (TTM) using age and AMH. AMH predicted TTM, however, added value on top of age was poor (age alone C-statistic 84%; age + AMH HR 0.66 95% CI 0.61-0.71, C-statistic 86%). Moreover, the capacity of AMH to predict early (≤45 years) and late menopause (≥55 years) was assessed. An added effect of AMH was demonstrated for early menopause (age alone C-statistic 52%; age + AMH HR 0.33, 95% CI 0.24-0.45, C-statistic 80%). A Weibull regression model calculating individual age at menopause revealed that predictive inaccuracy remained present and increased with decreasing age at menopause. Lastly, a check of non-proportionality of the predictive effect of AMH demonstrated a reduced predictive effect with increasing age. CONCLUSION AMH was a significant predictor of TTM and especially of time to early menopause. However, individual predictions of age at menopause demonstrated a limited precision, particularly when concerning early age at menopause, making clinical application troublesome.
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Affiliation(s)
- M Depmann
- University Medical Center Utrecht, Department of Reproductive Medicine & Gynecology, Utrecht, The Netherlands
| | - M J C Eijkemans
- Julius Center for Health Sciences and Primary Care, Department of Biostatistics and Research Support, Utrecht, The Netherlands
| | - S L Broer
- University Medical Center Utrecht, Department of Reproductive Medicine & Gynecology, Utrecht, The Netherlands
| | - F Ramezani Tehrani
- Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - M Solaymani-Dodaran
- Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - F Azizi
- Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - C B Lambalk
- VU University Medical Center, Department of Obstetrics and Gynecology, IVF Center, Amsterdam, The Netherlands
| | - J F Randolph
- University of Michigan Medical Center, Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Ann Arbor, Michigan
| | - S D Harlow
- University of Michigan, Department of Epidemiology, School of Public Health, Ann Arbor, MI, USA
| | - E W Freeman
- Perelman School of Medicine, Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, PA, USA
| | - M D Sammel
- Perelman School of Medicine, Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania, Philadelphia, PA, USA
| | - W M M Verschuren
- Julius Center for Health Sciences and Primary Care, Department of Biostatistics and Research Support, Utrecht, The Netherlands
| | - Y T van der Schouw
- Julius Center for Health Sciences and Primary Care, Department of Biostatistics and Research Support, Utrecht, The Netherlands
| | - B W Mol
- Monash Medical Center, Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - F J M Broekmans
- University Medical Center Utrecht, Department of Reproductive Medicine & Gynecology, Utrecht, The Netherlands
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Koester DC, Freeman EW, Wildt DE, Terrell KA, Franklin AD, Meeks K, Crosier AE. Group management influences reproductive function of the male cheetah (Acinonyx jubatus). Reprod Fertil Dev 2018; 29:496-508. [PMID: 26388294 DOI: 10.1071/rd15138] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 08/13/2015] [Indexed: 11/23/2022] Open
Abstract
Although the free-ranging cheetah is generally socially solitary, as many as 60% of males live in same-sex (usually sibling) coalitions. Under ex situ conditions, the cheetah experiences low reproductive success with only ~18% of males having ever produced young. Most male cheetahs (85%) are managed in captivity in coalitions, but with no data on the influence of social grouping on reproductive parameters. We examined the influence of singleton versus coalition management on various male cheetah physiological traits, including ejaculate quality and gonadal and adrenal hormone metabolite concentrations. We also assessed behaviour within coalitions for evidence of social hierarchy through initiation of interactions with group mates and relatedness to physiological traits. Ejaculate quality (including total motile and structurally normal spermatozoa per ejaculate) and androgen concentration profiles were higher (P<0.05) in coalition compared with singleton males. These results support the conclusion that testis function in the cheetah, specifically related to the development of normal, motile spermatozoa and androgen production, is influenced by management with same-sex conspecifics. The findings have implications for ex situ conservation breeding programs by suggesting that reproductive quality can be enhanced through group maintenance of cheetah males.
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Affiliation(s)
- Diana C Koester
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Elizabeth W Freeman
- New Century College, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
| | - David E Wildt
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Kimberly A Terrell
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Ashley D Franklin
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, USA
| | - Karen Meeks
- White Oak Conservation Center, 581705 White Oak Road, Yulee, FL 32097, USA
| | - Adrienne E Crosier
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Road, Front Royal, VA 22630, USA
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15
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Reed SD, Newton KM, Larson JC, Booth-LaForce C, Woods NF, Landis CA, Tolentino E, Carpenter JS, Freeman EW, Joffe H, Anawalt BD, Guthrie KA. Daily salivary cortisol patterns in midlife women with hot flashes. Clin Endocrinol (Oxf) 2016; 84:672-9. [PMID: 26663024 PMCID: PMC5106033 DOI: 10.1111/cen.12995] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 10/02/2015] [Accepted: 11/29/2015] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Diurnal salivary cortisol patterns in healthy adults are well established but have not been studied in midlife women with hot flashes. We hypothesized that frequent hot flashes are associated with aberrant cortisol patterns similar to sleep-deficient individuals. DESIGN Cross-sectional. PARTICIPANTS A total of 306 women, ages 40-62, randomized to a behavioural intervention for hot flashes. MEASUREMENTS Baseline comparisons of cortisol geometric means (nmol/l) from four daily time points averaged over two consecutive days plus other calculated cortisol measures were made between groups defined by baseline: (i) mean daily hot flash frequency tertile (≤5·5, N = 103; >5·5-8·8, N = 103; >8·8, N = 100) and (ii) selected characteristics. Repeated-measures linear regression models of log-transformed cortisol evaluated group differences, adjusting for covariates. RESULTS Women were 67% White and 24% African American, with 7·6 (SD 3·9) hot flashes per day. Salivary cortisol geometric means (nmol/l) among all women were as follows: 75·0 (SD 44·8) total, 8·6 (SD 5·6) wake, 10·0 (SD 7·5) wake +30 min, 3·7 (SD 3·3) early afternoon and 1·6 (SD 1·8) bedtime. Wake + 30-minute values showed an 18% median rise from wake values (interquartile range -24 to 96%), and means varied by hot flash frequency tertile, from lowest to highest: 11·4(SD 7·3), 10·3 (SD 6·5) and 8·6 (SD 7·8), respectively, P = 0·003. Beside the early afternoon value (P = 0·02), cortisol values did not vary by hot flash frequency. CONCLUSION Taken together, these findings suggest that high frequency of moderate-to-severe hot flashes may be associated with subtle abnormalities in cortisol concentrations - a pattern consistent with chronic sleep disturbance.
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Affiliation(s)
- S D Reed
- Departments of Obstetrics and Gynecology and Epidemiology, University of Washington School of Medicine, Seattle, WA, USA
| | - K M Newton
- Group Health Research Institute, Seattle, WA, USA
| | - J C Larson
- Data Coordinating Center, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - C Booth-LaForce
- School of Nursing, University of Washington, Seattle, WA, USA
| | - N F Woods
- School of Nursing, University of Washington, Seattle, WA, USA
| | - C A Landis
- School of Nursing, University of Washington, Seattle, WA, USA
| | - E Tolentino
- Laboratory Testing Services University of Washington Seattle WA
| | - J S Carpenter
- School of Nursing, Indiana University, Indianapolis, IN, USA
| | - E W Freeman
- Departments of Obstetrics and Gynecology and Psychiatry, Perelman School of Medicine, Philadelphia, PA, USA
| | - H Joffe
- Department of Psychiatry, Brigham and Women's Hospital and Dana Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - B D Anawalt
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - K A Guthrie
- Data Coordinating Center, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
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Koester DC, Freeman EW, Brown JL, Wildt DE, Terrell KA, Franklin AD, Crosier AE. Motile Sperm Output by Male Cheetahs (Acinonyx jubatus) Managed Ex Situ Is Influenced by Public Exposure and Number of Care-Givers. PLoS One 2015; 10:e0135847. [PMID: 26332582 PMCID: PMC4558051 DOI: 10.1371/journal.pone.0135847] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 07/27/2015] [Indexed: 11/18/2022] Open
Abstract
The collective cheetah (Acinonyx jubatus) population in zoological institutions has never been self-sustaining because of challenges in natural reproduction. A retrospective analysis of North American zoo-breeding records has revealed that >90% of litters produced since 2003 occurred in facilities ‘off-display’ from the public. We examined seminal, endocrine, and behavioral traits of 29 adult male cheetahs that were: 1) managed in public exhibit or off-display facilities; 2) maintained by different numbers of cheetah-specific care-givers; and 3) living adjacent to varying numbers of adult conspecifics. Cheetahs housed off-display produced more total motile sperm/ejaculate (P = 0.04) than on-exhibit males. This finding was mirrored in our laboratory’s historical records where two-fold more total motile sperm (P < 0.01) were measured in ejaculates from individuals with no public exposure (n = 43) compared to on-exhibit (n = 116) counterparts. Males at institutions with ≤3 care-givers also produced more total motile sperm/ejaculate (P < 0.03) and spent more time behaviorally active (P < 0.01) than at facilities using >3 care-givers. Exposure to high numbers of conspecifics within the same institution did not impact (P > 0.05) seminal traits, and presence of the public, care-giver number, or animals/facility had no influence (P > 0.05) on androgen or glucocorticoid excretion or other behavioral metrics. Findings indicate that male cheetahs are sensitive to general public exposure and too many care-givers, resulting in compromised motile sperm output/ejaculate with mechanism of action unrelated to altered androgen or glucocorticoid excretion.
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Affiliation(s)
- Diana C. Koester
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
- Department of Environmental Science and Policy, George Mason University, Fairfax, Virginia, United States of America
- * E-mail:
| | - Elizabeth W. Freeman
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
- New Century College, George Mason University, Fairfax, Virginia, United States of America
| | - Janine L. Brown
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
| | - David E. Wildt
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
| | - Kimberly A. Terrell
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, Louisiana, United States of America
| | - Ashley D. Franklin
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
- Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland, United States of America
| | - Adrienne E. Crosier
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, Virginia, United States of America
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Wisniewska M, Freeman EW, Schulte BA. Behavioural patterns among female African savannah elephants: the role of age, lactational status, and sex of the nursing calf. BEHAVIOUR 2015. [DOI: 10.1163/1568539x-00003301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
For social mammals, phenotypic factors, such as age and reproductive state, and environmental factors, such as competition and requirements for offspring, shape individual resource needs and cause animals to display behavioural patterns most useful in resource acquisition. Female mammals trade off investment in growth and survival against complex and resource-intensive reproductive challenges; thus, they alter behaviours according to changing priorities. To maximize net gain females increase resource intake or limit its expenditure. Behaviours that involve resource acquisition, such as foraging, are potentially rewarding, yet lead to competition, especially in group-living species; whereas behaviours that do not provide resources, such as resting or grooming, encourage sharing and buffer competition. In cooperative species with linear dominance hierarchies such as female African elephants (Loxodonta africana africana), rank is often determined by age and size, which are highly correlated. When compared with younger, competitively disadvantaged individuals, higher ranked animals attain greater access to resources, but other phenotypic and environmental factors may influence their needs. Hence, we examined how lactational status and sex of the nursing offspring influenced time spent on resource acquisition, and we assessed how these factors affect rates of aggression related to age. We conducted the study at Addo Elephant National Park in South Africa from June to December 2010, using 20 min focal animal sampling on reproductively mature females (). Adult females () exhibited aggression more frequently and socialized in a non-aggressive manner less frequently than subadult females (). Lactating females () spent more time foraging, displayed aggression more frequently, socialized in a non-aggressive manner less frequently, and exhibited chemosensory behaviours less frequently than non-lactating conspecifics (). Mothers of female calves () spent more time foraging than mothers of male calves (). The latter spent more time nursing and resting. We show how behavioural patterns, permitted or limited by age (correlated with size and rank) and reproductive condition, pertain to resource needs in female elephants, in contexts not directly related to survival or starvation avoidance. We discuss our findings in the context of female social relationships, for a long-lived, cooperative species.
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Affiliation(s)
- Maggie Wisniewska
- aDepartment of Biology, Western Kentucky University, Bowling Green, KY 42101, USA
| | | | - Bruce A. Schulte
- aDepartment of Biology, Western Kentucky University, Bowling Green, KY 42101, USA
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Freeman EW, Meyer JM, Adendorff J, Schulte BA, Santymire RM. Scraping behavior of black rhinoceros is related to age and fecal gonadal metabolite concentrations. J Mammal 2014. [DOI: 10.1644/13-mamm-a-059] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Johnson AEM, Freeman EW, Wildt DE, Songsasen N. Spermatozoa from the maned wolf (Chrysocyon brachyurus) display typical canid hyper-sensitivity to osmotic and freezing-induced injury, but respond favorably to dimethyl sulfoxide. Cryobiology 2014; 68:361-70. [PMID: 24731851 DOI: 10.1016/j.cryobiol.2014.04.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 04/04/2014] [Accepted: 04/07/2014] [Indexed: 10/25/2022]
Abstract
We assessed the influences of medium osmolality, cryoprotectant and cooling and warming rate on maned wolf (Chrysocyon brachyurus) spermatozoa. Ejaculates were exposed to Ham's F10 medium (isotonic control) or to this medium plus NaCl (350-1000mOsm), sucrose (369 and 479mOsm), 1M glycerol (1086mOsm) or dimethyl sulfoxide (Me2SO, 1151mOsm) for 10 min. Each sample then was diluted back into Ham's medium and assessed for sperm motility and plasma membrane integrity. Although glycerol and Me2SO had no influence (P>0.05), NaCl and sucrose solutions affected sperm motility (P<0.05), but not membrane integrity. Motility of sperm exposed to <600mOsm NaCl or sucrose was less (P<0.05) than fresh ejaculate, but comparable (P>0.05) to the control. As osmolality of the NaCl solution increased, motility decreased to <5%. In a separate study, ejaculates were diluted in Test Yolk Buffer containing 1M glycerol or Me2SO and cooled from 5°C to -120°C at -57.8°C, -124.2°C or -67.0°C/min, frozen in LN2, thawed in a water bath for 30s at 37°C or 10s at 50°C, and then assessed for motility, plasma- and acrosomal membrane integrity. Cryopreservation markedly (P<0.05) reduced sperm motility by 70% compared to fresh samples. Higher (P<0.05) post-thaw motility (20.0±1.9% versus 13.5±2.1%) and membrane integrity (51.2±1.7% versus 41.5±2.2%) were observed in samples cryopreserved in Me2SO than in glycerol. Cooling rates influenced survival of sperm cryopreserved in glycerol with -57.8°C/min being advantageous (P<0.05). The findings demonstrate that although maned wolf spermatozoa are similar to domestic dog sperm in their sensitivity to osmotic-induced motility damage, the plasma membranes tolerate dehydration, and the cells respond favorably to Me2SO as a cryoprotectant.
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Affiliation(s)
- Amy E M Johnson
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, USA; Department of Environmental Science and Policy, George Mason University, Fairfax, VA, USA
| | | | - David E Wildt
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, USA
| | - Nucharin Songsasen
- Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, USA.
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20
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Johnson AEM, Freeman EW, Colgin M, McDonough C, Songsasen N. Induction of ovarian activity and ovulation in an induced ovulator, the maned wolf (Chrysocyon brachyurus), using GnRH agonist and recombinant LH. Theriogenology 2014; 82:71-9. [PMID: 24742964 DOI: 10.1016/j.theriogenology.2014.03.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 02/27/2014] [Accepted: 03/06/2014] [Indexed: 12/01/2022]
Abstract
Assisted reproductive techniques, such as ovarian manipulation and artificial insemination, are useful for enhancing genetic management of threatened wildlife maintained ex situ. In this study, we used noninvasive fecal hormone monitoring to investigate (1) the influence of pairing with a male on endocrine responses of female maned wolves (Chrysocyon brachyurus) to a GnRH agonist (deslorelin) and (2) the efficiency of recombinant LH (reLH) on ovulation induction in females housed alone. Deslorelin (2.1 mg Ovuplant) was given to females that were either paired with a male (n = 4) or housed alone (n = 7); the implant was removed 7 to 11 days postimplantation. Three of seven singleton females were injected with reLH (0.0375 mg) on the day of implant removal, whereas the remaining females (n = 4) did not receive the additional treatment. Fecal samples were collected 5 to 7 days/wk from all females starting 11 days prior to hormone insertion until at least 70 days post implant removal for a total of 11 hormone treatment cycles. Fecal estrogen and progestagen metabolites were extracted and analyzed by enzyme immunoassay. Evidence of ovulation, demonstrated by a surge of estrogen followed by a significant rise in progestagen, occurred in all paired females. Three of the four singleton females that did not receive reLH treatment exhibited no rise in progestagen after an estrogen surge. All singleton females treated with reLH exhibited a rise in fecal progestagen after injection, indicating ovulation. In conclusion, deslorelin is effective at inducing ovarian activity and ovulation in paired female maned wolves; however, exogenous reLH is needed to induce ovulation in females housed alone. The findings obtained from this study serve as a foundation for future application of artificial insemination to enhance genetic management of this threatened species ex situ.
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Affiliation(s)
- Amy E M Johnson
- Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, USA; Environmental Science and Policy, College of Science, George Mason University, Fairfax, Virginia, USA
| | | | - Mark Colgin
- Venaxis, Inc. (formerly AspenBio Pharma, Inc.), Castle Rock, Colorado, USA
| | - Caitlin McDonough
- Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, USA
| | - Nucharin Songsasen
- Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, Virginia, USA.
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Capiro JM, Stoops MA, Freeman EW, Clawson D, Schook MW. Effects of management strategies on glucocorticoids and behavior in Indian rhinoceros (Rhinoceros unicornis): translocation and operant conditioning. Zoo Biol 2014; 33:131-43. [PMID: 24523250 DOI: 10.1002/zoo.21119] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 01/05/2014] [Accepted: 01/14/2014] [Indexed: 11/11/2022]
Abstract
The ex situ Indian rhino population experienced a decrease in genetic diversity indicating that the breeding program could possibly benefit from novel reproductive management strategies to ensure population sustainability. We sought to determine how management tools used for reproductive management, specifically translocation and operant conditioning, impact physiological and behavioral measures of welfare in Indian rhinos. First, an adrenocorticotropic hormone challenge performed in an adult male resulted in a 38-fold increase in urinary and a 3.5-fold increase in fecal glucocorticoid metabolites (FGM). Mean and peak FGM differed among three females, but all demonstrated elevated (P < 0.0001) concentrations for variable durations after translocation that lasted up to 9 weeks. Lastly, behavioral and adrenal responses of two females to operant conditioning to stand during transrectal ultrasound exams were monitored and rhinos differed in their mean and peak FGM concentrations. However, FGM were not different before versus during training or on pasture versus in the barn. One female exhibited more stereotypic behavior during training in the barn than on pasture (P < 0.05); although, stereotypies (1.73% of time) were relatively uncommon overall. In summary, individual variation exists in FGM both at baseline levels and in response to a stressor. In addition, while a transient rise in glucocorticoid activity post-translocation indicated that Indian rhinos have a physiological response to changes in their environment, minor alterations in daily routines using operant conditioning only resulted in minimal changes in behaviors and FGM.
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Affiliation(s)
- Jonnie M Capiro
- Cincinnati Zoo and Botanical Garden, Center for Conservation and Research of Endangered Wildlife, Cincinnati, Ohio; Zoo and Aquarium Leadership Concentration, Master's of Interdisciplinary Studies, George Mason University, Fairfax, Virginia
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Freeman EW, Meyer JM, Bird J, Adendorff J, Schulte BA, Santymire RM. Impacts of environmental pressures on the reproductive physiology of subpopulations of black rhinoceros (Diceros bicornis bicornis) in Addo Elephant National Park, South Africa. Conserv Physiol 2014; 2:cot034. [PMID: 27293618 PMCID: PMC4732468 DOI: 10.1093/conphys/cot034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 11/20/2013] [Accepted: 11/27/2013] [Indexed: 05/19/2023]
Abstract
Black rhinoceros are an icon for international conservation, yet little is known about their physiology due to their secretive nature. To overcome these challenges, non-invasive methods were used to monitor rhinoceros in two sections of Addo Elephant National Park, South Africa, namely Addo and Nyathi. These sections were separated by a public road, and the numbers of elephants, predators and tourists were higher in Addo. Faecal samples (n = 231) were collected (from July 2007 to November 2010) from known individuals and analysed for progestagen and androgen metabolite (FPM and FAM, respectively) concentrations. As biotic factors could impact reproduction, we predicted that demographics, FPM and FAM would vary between sections and with respect to season (calendar and wet/dry), climate and age of the rhinoceros. Mean FPM concentrations from pregnant females were seven times higher (P < 0.05) than samples from non-pregnant rhinoceros. Positive relationships were found between monthly temperatures and FPM from non-pregnant females (r (2) = 0.25, P = 0.03) and the percentage of calves born (r = 0.609, P = 0.04). Although FAM peaked in the spring, when the majority of calves (40%) were conceived, no seasonal patterns in male androgen concentrations were found with respect to month of conception and parturition. Females in Addo had a longer inter-calving interval and were less likely to be pregnant (P < 0.05) compared with those in Nyathi. The biotic stressors (e.g. predators and more competitors) within Addo section could be affecting the reproductive physiology of the rhinoceros negatively. Enhanced knowledge about how black rhinoceros populations respond to environmental stressors could guide management strategies for improving reproduction.
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Affiliation(s)
- Elizabeth W. Freeman
- New Century College, George Mason University, Fairfax, VA, USA
- Corresponding author: George Mason University, 4400 University Drive, MS 5D3, Fairfax, VA 22030, USA. Tel: 703-993-9272.
| | - Jordana M. Meyer
- Department of Conservation and Science, Lincoln Park Zoo, Chicago, IL, USA
| | - Jed Bird
- South African National Parks, Addo Elephant National Park, Addo, South Africa
| | - John Adendorff
- South African National Parks, Addo Elephant National Park, Addo, South Africa
| | - Bruce A. Schulte
- Department of Biology, Western Kentucky University, Bowling Green, KY, USA
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Freeman EW, Meyer JM, Putman SB, Schulte BA, Brown JL. Ovarian cycle activity varies with respect to age and social status in free-ranging elephants in Addo Elephant National Park, South Africa. Conserv Physiol 2013; 1:cot025. [PMID: 27293609 PMCID: PMC4806622 DOI: 10.1093/conphys/cot025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 08/18/2013] [Accepted: 08/19/2013] [Indexed: 05/03/2023]
Abstract
Free-ranging African elephants live in a fission-fusion society, at the centre of which is the matriarch. Matriarchs are generally older females that guide their families to resources and co-ordinate group defense. While much is known about elephant society, knowledge is generally lacking about how age affects the physiology of wild elephants. Investigation of the ovarian activity of free-ranging elephants could provide insight into the reproductive ageing process, with implications for population management. Faecal samples were collected from 46 individuals ranging in age from 14 to 60 years for a 2-year period, and progestagen metabolite analyses were used to examine relationships between social status, age, season, and ovarian activity in female elephants in Addo Elephant National Park, South Africa. Social status was the strongest predictor of faecal progestagen metabolite concentrations in non-pregnant elephants, with grand matriarchs (n = 6) having the lowest values compared with matriarchs (n = 21) and non-matriarch females (n = 19). Likewise, social status and age were the strongest predictors of faecal progestagen metabolite concentrations in pregnant elephants (n = 27). The number of years since a non-pregnant female gave birth to her last calf (post-partum duration) was longer for older females with a higher social status, as well as during the dry season. Our results indicate that social standing and age of elephants are related to reproductive function, and that older females exhibit reductions in ovarian capacity. These results expand our understanding of reproduction and fertility throughout an elephant's lifespan, and the factors that impact gonadal function in free-ranging females. Given that possible over-abundance of elephants in areas such as Addo Elephant National Park is fuelling the debate over how best to manage these populations, knowledge about the reproductive potential of high-ranking females can provide managers with biological data to identify the best candidates for controlling growth through translocation or contraception.
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Affiliation(s)
- Elizabeth W. Freeman
- New Century College, George Mason University, Fairfax, VA 22030, USA
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, VA 22630, USA
| | - Jordana M. Meyer
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, VA 22630, USA
| | - Sarah B. Putman
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, VA 22630, USA
| | - Bruce A. Schulte
- Department of Biology, Western Kentucky University, Bowling Green, KY 42101, USA
| | - Janine L. Brown
- Center for Species Survival, Smithsonian Conservation Biology Institute, Front Royal, VA 22630, USA
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Abstract
STUDY OBJECTIVES The objectives of this study were to characterize sleep patterns and determine factors, including sex, age, season, and environmental pressures, that influence sleep in the endangered black rhinoceros (rhino; Diceros bicornis bicornis). DESIGN To noninvasively observe sleep behavior of wild rhinos, digital infrared cameras were erected on poles at two bedding sites from September 2009 to March 2010. SETTING The study site was located in South Africa's Addo Elephant National Park (AENP) in the Main Camp (Addo) and Nyathi sections. PARTICIPANTS A total of 2,417 photos captured rhino sleep behavior on eight individual rhinos during 40 separate sleeping bouts (Addo, n = 15; Nyathi, n = 25). INVENTIONS N/A. RESULTS Results demonstrated that age and season did not affect rhino sleep behavior (P > 0.05); however, sex did influence the length of sleep bouts with males (n = 27; mean, 105.6 ± 11.3 min; range, 14.0-202.0 min) sleeping longer (F(1,48) = 6.93, P = 0.01) than females (n = 13; mean, 58.6 ± 10.4 min; range, 11.0-132.0 min). Park section did not influence the length of sleep episodes, but did affect (rw(40) = 0.88; P < 0.025) the time at which rhinos slept (Addo, 20:00-24:00; Nyathi, 20:00-04:00). CONCLUSIONS This is the first study to characterize sleep behavior in wild black rhinos. This study resulted in a greater understanding of the biologic factors that affect sleep in wild rhinos and can provide information to assist their management and conservation.
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Affiliation(s)
- Rachel Santymire
- Department of Conservation and Science, Lincoln Park Zoo, Chicago, IL, USA.
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Ganswindt A, Brown JL, Freeman EW, Kouba AJ, Penfold LM, Santymire RM, Vick MM, Wielebnowski N, Willis EL, Milnes MR. International Society for Wildlife Endocrinology: the future of endocrine measures for reproductive science, animal welfare and conservation biology. Biol Lett 2012; 8:695-7. [PMID: 22219389 DOI: 10.1098/rsbl.2011.1181] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Hormone analysis is a precise and widely accepted tool for monitoring reproductive function and responses to stressors. Although hormones are present and can be measured in various biological matrices, non-invasive methods have gained popularity over the past 30 years as a more practical approach for assessing ovarian, testicular and, more recently, adrenocortical activity in intractable wildlife species. Non-invasive hormone monitoring also has been key to understanding biological mechanisms related to observed behaviours of captive and free-ranging animals. Despite the increasing popularity of this research field, wildlife endocrinologists have not had a specific forum for sharing and discussing their latest findings, technical developments and common challenges. To provide such a communication platform, the International Society for Wildlife Endocrinology (ISWE) was established in 2010, followed by an international meeting held on 3-4 November 2011 at the Toronto Zoo, Canada. Over several sessions, keynote speakers and participants discussed recent developments of new and innovative methods for hormone monitoring, as well as the latest advances in basic endocrinology as applied to adrenal function, reproductive physiology, animal health, ecology and evolution. Here, we introduce ISWE to the scientific community and discuss how this new society will serve as a resource for wildlife endocrinologists worldwide.
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Affiliation(s)
- André Ganswindt
- Department of Zoology and Entomology, Mammal Research Institute, University of Pretoria, Pretoria, Republic of South Africa.
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Freeman EW, Schulte BA, Brown JL. Investigating the impact of rank and ovarian activity on the social behavior of captive female African elephants. Zoo Biol 2010; 29:154-67. [PMID: 20391466 DOI: 10.1002/zoo.20235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Over a third of captive female African elephants in North America fail to exhibit normal estrous cycles based on long-term serum progestagen analyses. Why acyclicity occurs is unknown; however, the majority of noncycling females are ranked by keepers as the dominant individual within the group. To investigate the relationship between ovarian cyclicity status and keeper-determined social rank, observations were conducted on 33 female African elephants (18 cycling, 15 noncycling). Based on keeper evaluations, five cycling elephants were ranked dominant, seven in the middle and six as subordinate. In contrast, 10 noncycling elephants were ranked as dominate and five as subordinate with none ranked as middle. When comparing the behavior of the elephants by their keeper-determined rank, the dominant females dominant were significantly more likely to approach, displace and push. Similarly, keeper-determined subordinate females more frequently presented their hind end and held their ears erect. Behaviors initiated by one elephant toward another did not vary between cycling and noncycling females, except when the interaction with social rank was tested. Dominant, noncycling females initiated a higher percentage of "approach" and "displace" behaviors than both cycling and noncycling, subordinate elephants. Subordinate, noncycling elephants displayed the highest percentage of "ears erect." Social rank drives the interactions of ex situ female African elephants more than ovarian cyclicity status. Thus, behavioral interactions cannot be used to predict which cycling elephants are most likely to become acyclic.
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Affiliation(s)
- Elizabeth W Freeman
- National Zoological Park, Conservation & Research Center, Front Royal, Virginia, USA.
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Brown JL, Kersey DC, Freeman EW, Wagener T. Assessment of diurnal urinary cortisol excretion in Asian and African elephants using different endocrine methods. Zoo Biol 2010; 29:274-83. [DOI: 10.1002/zoo.20268] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Freeman EW, Abbondanza FN, Meyer JM, Schulte BA, Brown JL. A simplified method for monitoring progestagens in African elephants under field conditions. Methods Ecol Evol 2010. [DOI: 10.1111/j.2041-210x.2009.00004.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Proctor CM, Freeman EW, Brown JL. Influence of dominance status on adrenal activity and ovarian cyclicity status in captive African elephants. Zoo Biol 2009; 29:168-78. [PMID: 20033989 DOI: 10.1002/zoo.20292] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The North American African (Loxodonta africana) elephant population is not self-sustaining, in part because of a high rate of abnormal ovarian activity. About 12% of adult females exhibit irregular cycles and 31% do not cycle at all. Our earlier work revealed a relationship between dominance status and ovarian acyclicity, with dominant females being more likely to not cycle normally. One theory is that dominant females may be expending more energy to maintaining peace within the captive herd than for supporting reproduction. The goal of this study was to determine if there was a relationship among dominance status, serum cortisol concentrations, and ovarian acyclicity. We hypothesized that adrenal glucocorticoid activity would be increased in dominant, noncycling elephants as compared with subdominant individuals. Blood samples were collected weekly over a 2-year period in 81 females of known dominance and cyclicity status, and analyzed for cortisol. Based on a path analysis model (Reticular Action Model Or Near Approximation [RAMONA]), noncycling, dominant African elephant females did not have higher mean serum cortisol concentrations, or exhibit more variability (i.e., coefficient of variation, standard deviation) in cortisol secretion. This study suggests that alterations in adrenal activity are not related to dominance status nor contribute directly to acyclicity in captive African elephants.
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Affiliation(s)
- Christine M Proctor
- Department of Reproductive Sciences, Smithsonian National Zoological Park, Conservation and Research Center, Front Royal, Virginia 22630, USA
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Freeman EW, Guagnano G, Olson D, Keele M, Brown JL. Social factors influence ovarian acyclicity in captive African elephants (Loxodonta africana). Zoo Biol 2009; 28:1-15. [PMID: 19358314 DOI: 10.1002/zoo.20187] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Nearly one-third of reproductive age African elephants in North America that are hormonally monitored fail to exhibit estrous cycle activity, which exacerbates the nonsustainability of the captive population. Three surveys were distributed to facilities housing female African elephants to determine how social and environmental variables contribute to cyclicity problems. Forty-six facilities returned all three surveys providing information on 90% of the SSP population and 106 elephants (64 cycling, 27 noncycling and 15 undetermined). Logistic analyses found that some physiological and social history variables were related to ovarian acyclicity. Females more likely to be acyclic had a larger body mass index and had resided longer at a facility with the same herdmates. Results suggest that controlling the weight of an elephant might be a first step to helping mitigate estrous cycle problems. Data further show that transferring females among facilities has no major impact on ovarian activity. Last, social status appears to impact cyclicity status; at 19 of 21 facilities that housed both cycling and noncycling elephants, the dominant female was acyclic. Further studies on how social and environmental dynamics affect hormone levels in free-living, cycling elephants are needed to determine whether acyclicity is strictly a captivity-related phenomenon.
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Affiliation(s)
- Elizabeth W Freeman
- Department of Reproductive Sciences, Conservation & Research Center, National Zoological Park, Smithsonian Institution, Front Royal, Virginia 22630, USA.
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Freeman EW, Schulte BA, Brown JL. Using behavioral observations and keeper questionnaires to assess social relationships among captive female African elephants. Zoo Biol 2009; 29:140-53. [DOI: 10.1002/zoo.20249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Proctor CM, Freeman EW, Brown JL. Results of a second survey to assess the reproductive status of female Asian and African elephants in North America. Zoo Biol 2009; 29:127-39. [DOI: 10.1002/zoo.20238] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
OBJECTIVE Many studies have evaluated the relationships between ethnicity and culture, prevalence of menopausal symptoms, and attitudes toward them, but few have assessed menopausal symptoms across cultures world-wide. This paper aims to systematically review the prevalence of hot flushes and night sweats, two prevalent symptoms of menopause, across the menopausal stages in different cultures and considers potential explanations for differences in prevalence rates. DESIGN Sixty-six papers formed the basis for this review. Studies were organized by geographic region, and results are presented for North America, Europe, East Asia, Southeast Asia, Australia, Latin America, South Asia, Middle East, and Africa. Studies were included if they provided quantitative information on the occurrence of hot flushes. This report focuses on hot flushes and night sweats, the most common menopausal symptoms reported in epidemiologic studies. RESULTS Studies reviewed indicate that vasomotor symptoms are highly prevalent in most societies. The prevalence of these symptoms varies widely and may be influenced by a range of factors, including climate, diet, lifestyle, women's roles, and attitudes regarding the end of reproductive life and aging. Patterns in hot flush prevalence were apparent for menopausal stages and, to a lesser degree, for regional variation. CONCLUSIONS Caregivers should recognize that variations exist and ask patients specific questions about symptoms and their impact on usual functioning.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics and Gynecology, University of Pennsylvania 19104, USA
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Brown JL, Somerville M, Riddle HS, Keele M, Duer CK, Freeman EW. Comparative endocrinology of testicular, adrenal and thyroid function in captive Asian and African elephant bulls. Gen Comp Endocrinol 2007; 151:153-62. [PMID: 17336304 DOI: 10.1016/j.ygcen.2007.01.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 12/07/2006] [Accepted: 01/10/2007] [Indexed: 11/22/2022]
Abstract
Concentrations of serum testosterone, cortisol, thyroxine (free and total T4), triiodothyronine (free and total T3) and thyroid stimulating hormone (TSH) were measured to assess adrenal and thyroid function as they relate to testicular activity and musth in captive elephants. Blood samples were collected approximately weekly from Asian (n=8) and African (n=12) bulls at seven facilities for periods of 4 months to 9.5 years. Age ranges at study onset were 8-50 years for Asian and 10-21 years for African elephants. Based on keeper logs, seven Asian and three African bulls exhibited behavioral and/or physical (temporal gland secretion, TGS, or urine dribbling, UD) signs of musth, which lasted 2.8+/-2.5 months in duration. Serum testosterone was elevated during musth, with concentrations often exceeding 100 ng/ml. Patterns of testosterone secretion and musth varied among bulls with no evidence of seasonality (P>0.05). Only three bulls at one facility exhibited classic, well-defined yearly musth cycles. Others exhibited more irregular cycles, with musth symptoms often occurring more than once a year. A number of bulls (1 Asian, 9 African) had consistently low testosterone (<10 ng/ml) and never exhibited significant TGS or UD. At facilities with multiple bulls (n=3), testosterone concentrations were highest in the oldest, most dominant male. There were positive correlations between testosterone and cortisol for six of seven Asian and all three African males that exhibited musth (range, r=0.23-0.52; P<0.05), but no significant correlations for bulls that did not (P>0.05). For the three bulls that exhibited yearly musth cycles, TSH was positively correlated (range, r=0.22-0.28; P<0.05) and thyroid hormones (T3, T4) were negatively correlated (range, r=-0.25 to -0.47; P<0.05) to testosterone secretion. In the remaining bulls, there were no clear relationships between thyroid activity and musth status. Overall mean testosterone and cortisol concentrations increased with age for all bulls combined, whereas thyroid activity declined. In summary, a number of bulls did not exhibit musth despite being of adequate physical maturity. Cortisol and testosterone were correlated in most bulls exhibiting musth, indicating a possible role for the adrenal gland in modulating or facilitating downstream responses. Data were generally inconclusive as to a role for thyroid hormones in male reproduction, but the finding of discrete patterns in bulls showing clear testosterone cycles suggests they may facilitate expression or control of musth in some individuals.
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Affiliation(s)
- Janine L Brown
- Department of Reproductive Sciences, Smithsonian Institution, National Zoological Park, Conservation and Research Center, 1500 Remount Road, Front Royal, VA 22630, USA
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Freeman EW, Sammel MD, Gracia CR, Kapoor S, Lin H, Liu L, Nelson DB. Follicular phase hormone levels and menstrual bleeding status in the approach to menopause. Fertil Steril 2005; 83:383-92. [PMID: 15705379 DOI: 10.1016/j.fertnstert.2004.06.066] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2004] [Revised: 06/29/2004] [Accepted: 06/29/2004] [Indexed: 11/24/2022]
Abstract
OBJECTIVE (1) Characterize the relationship between follicular phase hormone levels and menstrual bleeding patterns in the approach to menopause; (2) identify racial differences in hormone levels; (3) determine independent contributions of menstrual status, race, age, BMI, and smoking to hormone levels. DESIGN Randomly identified, population-based cohort, stratified to obtain equal numbers of African American and Caucasian women, prospectively followed for 5 years. SETTING Women in Philadelphia County, PA, identified by random-digit telephone dialing. PARTICIPANT(S) Women aged 35 to 47 years with regular menstrual cycles at enrollment (N = 436). DATA COLLECTION Blood sampling twice in each of 7 assessment periods during days 1-6 of the cycle, menstrual dates identified through structured interview and daily symptom reports, anthropometric measures and standardized questionnaires at each assessment period. MAIN OUTCOME MEASURE(S) Serum levels of follicular E(2), FSH, inhibin B, and LH. RESULT(S) The mean levels of E(2), FSH, inhibin B, and LH were differentially associated with the 5 menstrual status groups defined by changes in bleeding patterns. Significant changes in hormone levels occurred prior to missed menstrual cycles for inhibin B, FSH, and LH. All hormones had a highly significant interaction between menstrual status and BMI. African American women had significantly lower levels of E(2) and LH compared to Caucasian women in univariate analyses. The interaction of race, menstrual status, and BMI was highly significant (P<.001) for E(2), with African American women having lower E(2) levels until postmenopause, when E(2) levels were higher in AA women with BMI > or =25 and BMI > or =30. CONCLUSION(S) Levels of E(2), FSH, LH, and inhibin B are significantly associated with menstrual bleeding patterns in late reproductive age women and differentiate the earliest stages of the menopausal transition. Racial differences in mean levels of E(2) appear strongly mediated by BMI.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics and Gynecology, University of Pennsylvania, School of Medicine, Philadelphia, PA 19104, USA.
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Meyer JM, Walker SL, Freeman EW, Steinetz BG, Brown JL. Species and fetal gender effects on the endocrinology of pregnancy in elephants. Gen Comp Endocrinol 2004; 138:263-70. [PMID: 15364209 DOI: 10.1016/j.ygcen.2004.06.010] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2004] [Revised: 06/17/2004] [Accepted: 06/29/2004] [Indexed: 11/25/2022]
Abstract
Quantitative and temporal progestin profiles vary during gestation in the elephant, sometimes making it difficult to determine if a pregnancy is progressing normally. The aim of the present study was to determine if circulating progestin variability was related to species or fetal gender effects. A similar comparison also was conducted for secretory profiles of prolactin, relaxin, and cortisol. Overall mean progestin concentrations during gestation in Asian (n = 19) and African (n = 8) elephants were similar; however, the temporal profiles differed (P < 0.001). Concentrations were higher in African elephants during the first half of pregnancy, but then declined to levels below those observed in Asian elephants (P < 0.05). There also was a fetal gender effect in Asian, but not African elephants. Progestin concentrations were higher in Asian cows carrying male calves (n = 9) as compared to those carrying females (n = 10) (P < 0.001). Overall prolactin concentrations were higher in Asian than in African elephants between 8 and 15 months of gestation ( P< 0.001). There were no species differences in the secretory patterns of relaxin. Cortisol was relatively stable until the end of gestation when significant surges were observed, mainly between 8 and 11 days before parturition, and again on the day of birth. In sum, a comparison of progestin patterns between Asian and African elephants identified notable differences related to species and fetal gender. A role for cortisol in the initiation of parturition also was inferred from these data. From a practical standpoint, understanding the factors affecting gestational hormone characteristics and recognizing what the species differences are will help ensure that data used in diagnosing and monitoring elephant pregnancies are properly interpreted.
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Affiliation(s)
- Jordana M Meyer
- Department of Reproductive Sciences, Conservation and Research Center, National Zoological Park, Smithsonian Institution, Front Royal, VA 22630, USA
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Abstract
OBJECTIVE To estimate whether premenstrual syndrome (PMS) predicts common menopausal symptoms assessed longitudinally for 5 years among women in the transition to menopause. METHODS Data were obtained from a structured interview questionnaire, daily symptom ratings, and standard measures of depressive symptoms and sleep quality at 7 assessment periods in a population-based cohort of 436 women. Menstrual status was determined by menstrual bleeding dates. Hormones were measured in the early follicular phase, with a maximum of 14 measures per subject. Multivariate logistic regression models for repeated measures were used to estimate the effects of study variables. RESULTS Premenstrual syndrome significantly decreased with age (P <.001) and with changes in menstrual bleeding status (P =.003). Women with PMS at enrollment were more likely over the 5-year period to report menopausal hot flushes (odds ratio [OR] 2.09; confidence interval [CI] 1.42, 3.08; P <.001); depressed mood (OR 2.34; CI 1.60. 3.43; P <.001); poor sleep (OR 1.72; CI 1.16, 2.53; P =.007), and decreased libido (OR 1.54; CI 1.06, 2.24; P =.024) after adjusting for age, race, diagnosis of major depression, and estradiol. Subjects' fluctuations in estradiol were significantly associated with hot flushes, depressive symptoms, and poor sleep. CONCLUSION Premenstrual syndrome decreased in the transition to menopause. Women who reported PMS at baseline were at greater risk of menopausal hot flushes, depressed mood, poor sleep, and decreased libido. Further studies of the associations of symptoms and changes in ovarian function are needed to elucidate the underlying symptom physiology and aid in the development of effective treatments for women during the menopausal transition.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics/Gynecology, University of Pennsylvania, Philadelphia 19104, USA.
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Kim DR, Gyulai L, Freeman EW, Morrison MF, Baldassano C, Dubé B. Premenstrual dysphoric disorder and psychiatric co-morbidity. Arch Womens Ment Health 2004; 7:37-47. [PMID: 14963731 DOI: 10.1007/s00737-003-0027-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2003] [Accepted: 08/21/2003] [Indexed: 10/26/2022]
Abstract
Premenstrual dysphoric disorder (PMDD) can occur co-morbidly with other axis I disorders, particularly mood and anxiety disorders. The data supporting this diagnostic dilemma are reviewed in terms of methodological comparisons between studies. The point prevalence of the co-occurrence of PMDD and other psychiatric disorders is discussed as well as implications for treatment and further study.
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Affiliation(s)
- D R Kim
- Department of Psychiatry, Hospital of the University of Pennsylvania, Philadelphia, PA, USA.
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Brown JL, Olson D, Keele M, Freeman EW. Survey of the reproductive cyclicity status of Asian and African elephants in North America. Zoo Biol 2004. [DOI: 10.1002/zoo.20006] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Freeman EW, Weiss E, Brown JL. Examination of the interrelationships of behavior, dominance status, and ovarian activity in captive Asian and African elephants. Zoo Biol 2004. [DOI: 10.1002/zoo.20025] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Freeman EW. Evaluation of a unique oral contraceptive (Yasmin) in the management of premenstrual dysphoric disorder. EUR J CONTRACEP REPR 2002; 7 Suppl 3:27-34; discussion 42-3. [PMID: 12659404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Over three-quarters of women experience some physical and emotional changes associated with the menstrual cycle. Irritability, tension, fatigue, depression, breast tenderness and bloating are among the most common premenstrual symptoms. Approximately 5-10% of women of childbearing age experience premenstrual symptoms to a degree that disrupts their functioning in the home or workplace and that meet criteria for premenstrual dysphoric disorder (PMDD). Serotonergic antidepressants are clearly effective for PMDD, with about 60% of subjects responding to this treatment in controlled studies. Oral contraceptives are commonly used to treat premenstrual symptoms but are an understudied intervention with no information on their efficacy for PMDD). The recent introduction of an oral contraceptive (Yasmin, Schering AG, Berlin, Germany), containing low-dose ethinylestradiol (EE) combined with a new progestogen, drospirenone (DRSP), may offer clinical efficacy for PMDD as a result of the unique pharmacological profile of this progestogen, which is a spirolactone derivative with antimineralocorticoid and antiandrogenic activity. A randomized, placebo-controlled study of DRSP/EE in women with PMDD found a consistently greater reduction of symptoms-from baseline for all 22 premenstrual symptoms assessed (using the Calendar of Premenstrual Experiences, COPE) and for the four statistically derived symptom factors in the group taking DRSP/EE compared to the placebo group. For appetite, acne and food craving (factor 3), the difference between the DRSP/EE group and the placebo group was statistically significant (p = 0.027). These preliminary results suggest the beneficial effect of DRSP/EE on PMDD and offer an alternative class of medication that also provides the range of benefits of oral contraception for women with PMDD.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics/Gynecology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Affiliation(s)
- E W Freeman
- Department of Obstetrics & Gynecology, University of Pennsylvania, Philadelphia, USA.
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Abstract
OBJECTIVE To evaluate the efficacy and safety of venlafaxine, a new-generation antidepressant that selectively inhibits serotonin and norepinephrine reuptake, in the treatment of premenstrual dysphoric disorder (PMDD). METHOD We conducted a randomized, double-blind, placebo-controlled, parallel-group, flexible-dose trial. After three screening cycles, including a single-blind placebo cycle, 164 women were randomly assigned to double-blind treatment with venlafaxine (50-200 mg/day) or placebo for four menstrual cycles. Primary outcome measures were the total premenstrual symptom scores as assessed by a daily symptom report (DSR) and the Hamilton Rating Scale for Depression. RESULTS Venlafaxine was significantly more effective than placebo in reducing PMDD symptoms as assessed by DSR scores (P <.001 for last observation carried forward and observed analyses). Sixty percent of venlafaxine versus 35% of placebo subjects improved >50% (P =.003). Forty-three percent of venlafaxine subjects versus 25% of placebo subjects experienced symptom remission, defined as reduction of DSR scores to the postmenstrual level (P =.034). Venlafaxine treatment was significantly better than placebo for all statistically derived DSR factors (mood, function, pain, and physical symptoms). Improvement was relatively swift, with approximately 80% symptom reduction in the first treatment cycle. Mean venlafaxine doses ranged from 50 mg/day in the first treatment cycle to 130 mg/day in the fourth treatment cycle. Adverse events such as nausea, insomnia, and dizziness were mild and transient. CONCLUSIONS Venlafaxine is significantly more efficacious than placebo for PMDD treatment. Response to treatment can occur in the first treatment cycle, and venlafaxine is well tolerated. Further studies are needed to evaluate the potential of intermittent (luteal phase) dosing for this cyclic disorder and the efficacy of long-term maintenance treatment with venlafaxine.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics/Gynecology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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Morrison MF, Ten Have T, Freeman EW, Sammel MD, Grisso JA. DHEA-S levels and depressive symptoms in a cohort of African American and Caucasian women in the late reproductive years. Biol Psychiatry 2001; 50:705-11. [PMID: 11704078 DOI: 10.1016/s0006-3223(01)01169-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND The objective of this study was to elucidate the associations of dehydroepiandrosterone sulfate (DHEA-S) levels and depressive symptoms in African American and Caucasian women in the late reproductive years, a transitional age zone preceding the perimenopause, in which ovarian aging and associated endocrine changes begin. We had hypothesized that lower levels of DHEA-S would be associated with depressive symptoms and that, because DHEA-S levels decline with increasing age, older women would have an increased prevalence of depressive symptoms. METHODS This cross-sectional study used a population-based urban sample recruited through random digit telephone dialing. The sample was 338 women between the ages of 35 and 47 years with regular menses. Half the sample was African American and half was Caucasian. RESULTS Higher DHEA-S levels were associated with depressive symptoms in women in the younger half of this cohort. Lower DHEA-S levels were associated with depressive symptoms in the women in the older half of this cohort. The direction of the relationship of DHEA-S and depressive symptoms changes with age, being a positive relationship in younger women and an inverse relationship in the older women in this cohort. This change in the direction of the relationship appears to occur at a younger age in African American women. CONCLUSIONS Our hypothesis of a relationship between low DHEA-S levels and elevated depressive symptoms was supported only in the older women in this cohort. Unexpectedly, younger women in this cohort demonstrated a positive association between DHEA-S levels and depressive symptoms. Changes in DHEA-S levels, depressive symptoms, and the relationship of other hormones in the hypothalamic-pituitary-adrenal axis need to be better understood in premenopausal women approaching perimenopause.
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Affiliation(s)
- M F Morrison
- Department of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia, USA
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Hollander LE, Freeman EW, Sammel MD, Berlin JA, Grisso JA, Battistini M. Sleep quality, estradiol levels, and behavioral factors in late reproductive age women. Obstet Gynecol 2001; 98:391-7. [PMID: 11530118 DOI: 10.1016/s0029-7844(01)01485-5] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To estimate the prevalence of perceived poor sleep in women aged 35-49 years and to correlate sleep quality with levels of gonadal steroids and predictors of poor sleep. METHODS A cohort of 218 black and 218 white women aged 35-47 years at enrollment (aged 37-49 at final follow-up) with regular menstrual cycles was identified through random digit dialing for a longitudinal study of ovarian aging correlates. Data obtained at four assessment periods, including enrollment, over a 2-year interval were collected between days 1 and 6 (mean = 3.9) of the menstrual cycle. The primary outcome measure was subjects' rating of sleep quality at each assessment period. Associations of sleep quality with hormone levels (estradiol, follicle-stimulating hormone, luteinizing hormone, testosterone, and dehydroepiandrosterone sulfate) and other clinical, behavioral, and demographic variables were examined in bivariable and multivariable analyses. RESULTS Approximately 17% of subjects reported poor sleep at each assessment period. Significant independent associations with poor sleep included greater incidence of hot flashes (odds ratio [OR] 1.52; 95% confidence interval [CI] 1.08, 2.12, P =.02), higher anxiety levels (OR 1.03; 95% CI 1.00, 1.06, P =.04), higher depression levels (OR 1.05; 95% CI 1.02, 1.07, P <.001), greater caffeine consumption (OR 1.25; 95% CI 1.04, 1.49, P =.02), and lower estradiol levels in women aged 45-49 (OR 0.53; 95% CI 0.34, 0.84, P =.006), after adjustment for current use of sleep medications. CONCLUSION Both hormonal and behavioral factors were associated with sleep quality. Estradiol levels are an important factor in poor sleep reported by women in the 45-49 age group. Further evaluation of estrogen treatment for poor sleep of women 45 years and older is warranted.
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Affiliation(s)
- L E Hollander
- Department of Obstetrics and Gynecology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104-4283, USA.
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Freeman EW, Kroll R, Rapkin A, Pearlstein T, Brown C, Parsey K, Zhang P, Patel H, Foegh M. Evaluation of a unique oral contraceptive in the treatment of premenstrual dysphoric disorder. J Womens Health Gend Based Med 2001; 10:561-9. [PMID: 11559453 DOI: 10.1089/15246090152543148] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Premenstrual dysphoric disorder (PMDD) is a severe form of premenstrual syndrome (PMS). This is the first trial of a unique oral contraceptive containing a combination of drospirenone (DRSP, 3 mg) and ethinyl estradiol (EE, 30 microg) for the treatment of PMDD. DRSP is a spironolactone-like progestin with antiandrogenic and antimineralocorticoid activity. Spironolactone has been shown to be beneficial in PMS, whereas oral contraceptives have shown conflicting results. In this double-blind, placebo-controlled trial, 82 women with PMDD (Diagnostic and Statistical Manual of Mental Disorders, 4th ed. [DSM IV]) were randomized to receive DRSP/EE or placebo for three treatment cycles. The primary end point was change from baseline in luteal phase symptom scores as assessed on the Calendar of Premenstrual Experiences (COPE) scale. Patients treated with DRSP/EE showed a numerically greater change from baseline compared with those treated with placebo on each of the 22 COPE items and each of the 4 symptom factors. Between-group differences in symptom improvement reached statistical significance in factor 3 only (appetite, acne, and food cravings, p = 0.027). The secondary end points, Beck Depression Inventory (BDI) and Profile of Mood States (PMS), were consistent with the primary end point in that patients treated with the oral contraceptive showed a numerically greater improvement from baseline compared with those treated with placebo. The results of this study show a consistent trend in the reduction of symptoms that suggested a beneficial effect of DRSP/EE for the treatment of PMDD, despite limitations of the study design.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics/Gynecology, University of Pennsylvania, Philadelphia, PA, USA
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Abstract
OBJECTIVE Evaluate racial differences in reproducibility of hormone levels over time (estradiol, DHEAS, FSH, and testosterone) while adjusting for covariates previously identified as relevant in the study population. DESIGN Longitudinal cohort study. SETTING Healthy, late-reproductive-age women in a community-based sample. PATIENT(S) African American and Caucasian women identified by random digit dialing. INTERVENTION(S) Hormone levels measured in the early follicular phase of the menstrual cycle four times over 9 months. A multivariate, linear mixed model estimated effects on hormone levels of race, age at enrollment, age at menarche, number of pregnancies, current smoking, alcohol consumption, body mass index (BMI), waist/hip ratio (WHR), and menstrual cycle length. MAIN OUTCOME MEASURE(S) Follicular plasma levels of estradiol, FSH, DHEAS, and testosterone. RESULT(S) African American but not Caucasian women had significantly lower levels of estradiol and DHEAS with increasing age. African American but not Caucasian women had significantly decreased levels of estradiol and significantly increased levels of DHEAS with increasing BMI. No racial differences in reproducibility of hormone measures were found. CONCLUSION(S) There are racial differences in associations of hormone levels with age and BMI in late reproductive age women. Further study is needed to replicate these findings and to determine the relationships of these hormonal associations with menopausal symptoms.
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Affiliation(s)
- J M Manson
- University of Pennsylvania, School of Medicine, Center for Clinical Epidemiology and Biostatistics, Philadelphia, PA 19104, USA
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Freeman EW, Grisso JA, Berlin J, Sammel M, Garcia-Espana B, Hollander L. Symptom reports from a cohort of African American and white women in the late reproductive years. Menopause 2001; 8:33-42. [PMID: 11201513 DOI: 10.1097/00042192-200101000-00007] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To identify symptoms experienced in a cohort of healthy women in the late reproductive years; to compare symptom reports between African American and Caucasian women; and to determine the extent to which other factors in reproductive health, mood and behavior, lifestyle, and demographic background are associated with the reported symptoms. DESIGN A cohort of women aged 35 to 47 years (mean age, 41 years) was identified through random digit dialing. This study is a cross-sectional analysis of data collected at enrollment from a subset of 308 women who completed daily symptom reports (DSR) for one menstrual cycle. Data were obtained in structured interviews and self-administered standard questionnaires. The associations of the study variables with symptoms as assessed by the DSR were examined using analysis of variance and general linear models. RESULTS The African American women were significantly more likely to report in interview that they experienced menopausal symptoms (46% vs. 30%; p < 0.001) and had significantly higher ratings on the physiological symptom factor of the DSR, which included hot flashes, dizziness, poor coordination/clumsiness, urine leaks, and vaginal dryness. The DSR yielded two other factors of psychological and somatic symptoms. Race was associated only with the physiological symptom factor in the multivariable analyses. Neither race nor age were associated with psychological symptoms, which were predicted by current or past mood problems. CONCLUSIONS Symptoms commonly associated with the menopause are experienced in the late reproductive years before observable changes in menstrual cycles. African American women reported more physiological symptoms than white women. These data provide an essential baseline for longitudinal study of symptoms associated with the ovarian decline in the perimenopausal years.
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Affiliation(s)
- E W Freeman
- Department of Obstetrics/Gynecology, University of Pennsylvania Medical Center, Philadelphia 19104, USA
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