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El-Shalofy AS, Hedia MG. Effects of buserelin administration on testicular blood flow and plasma concentrations of testosterone and estradiol-17β in rams. Domest Anim Endocrinol 2021; 77:106646. [PMID: 34175682 DOI: 10.1016/j.domaniend.2021.106646] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 04/28/2021] [Accepted: 05/24/2021] [Indexed: 12/12/2022]
Abstract
This research aimed to examine for the first time the impact of single dose administration of gonadotropin-releasing hormone (GnRH) analog buserelin acetate on the testicular blood flow measurements (peak systolic velocity [PSV], end-diastolic systolic velocity [EDV], resistive index [RI], and pulsatility index [PI]) and the plasma steroids (testosterone and estradiol-17β) concentrations in rams. For this purpose, twelve adult Ossimi rams were randomly assigned into the buserelin group (n = 8) and were injected intravenously (iv) with buserelin acetate (0.008 mg/ram), whereas the remaining rams (n = 4) were injected with normal saline iv and served as a control group. Blood sampling and testicular pulsed-wave Doppler scanning were conducted immediately before (0) and 1, 3, 6, 24, 48, 72, 120, and 168 h after treatment. The control group did not reveal any substantial changes (P > 0.05) in the examined parameters, except for the EDV (P < 0.05). In the buserelin-treated group, a marked reduction in RI and PI values (P < 0.05) occurred 1 to 3 h after administration of buserelin. Besides, there was a significant increase in testosterone plasma concentrations following buserelin treatment. In conclusion, the administration of buserelin triggered a series of substantial changes in the testicular blood perfusion and steroidogenesis that could have a positive effect on testicular function in rams.
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Affiliation(s)
- A S El-Shalofy
- Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.
| | - M G Hedia
- Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.
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El Zawam A, Tibary A, Patino C. Basal Levels and hCG Responses of Serum Testosterone and Estrogen in Male Alpacas. Front Vet Sci 2020; 7:595856. [PMID: 33263018 PMCID: PMC7688520 DOI: 10.3389/fvets.2020.595856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/17/2020] [Indexed: 11/13/2022] Open
Abstract
Steroid response to human Chorionic Gonadotropin (hCG) administration has been used in various species to study testicular function and for diagnostic purposes. In this study, two experiments were conducted to determine serum testosterone concentration response to administration of hCG and its correlation with testicular weight. In the second experiment the relationship between age, testosterone and estrogen response to hCG, and testicular histometry was in pre-pubertal and post-pubertal male alpacas. For experiment 1, males in two age groups (2 to 3 years, n = 9) and (4 to 7 years; n = 15) received 3,000 IU hCG IV, 36 to 48 h before castration. Serum testosterone concentration was determined before (T0), 1 h (T1), 2 h (T2), 8 h (T8), and 24 h (T24) after administration of hCG. Basal concentrations of serum testosterone was significantly different (P < 0.01) between age groups. Serum testosterone concentrations increased over time and doubled 2 h after treatment. The highest change (250 to 300% increase from T0) was observed at 8 h (3.5 ± 0.3 ng/ml). A significant correlation (P < 0.01; r = 0.64) was found between serum testosterone concentration and total testicular weight. For experiment 2, 60 males ranging in age from 6 to 60 months were used. Serum testosterone and estrogen was determined in samples taken just prior to and 2 h after administration of 3,000 IU hCG. Basal serum testosterone concentrations were very low (≤0.1 ng/mL) until 9 months of age then increased steadily with age. There was a significant variation amongst males within the same age group. Serum testosterone concentration increased by 2- to 4-fold 2 h after hCG injection (P ≤ 0.05). Males in the 13 to 14 months of age group had the highest rise. Estrogen concentration increased in response to hCG administration and was detected only in males with high testosterone. We conclude that administration of 3,000 IU of hCG IV can be used reliably to detect testicular tissue and study its steroidogenic activity. The response is correlated with testicular weight and Leydig cell number. Testicular growth and sensitivity to LH stimulation increases between the ages of 13 and 14 months. The aromatizing ability of Leydig cells increased significantly in post-pubertal male alpacas.
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Affiliation(s)
- Aymen El Zawam
- Department of Surgery and Theriogenology, College of Veterinary Medicine, University of Tripoli, Tripoli, Libya
| | - Ahmed Tibary
- Comparative Theriogenology, Department of Veterinary Clinical Science, Center for Reproductive Biology, College of Veterinary Medicine, Washington State University, Pullman, WA, United States
| | - Cristian Patino
- Comparative Theriogenology, Department of Veterinary Clinical Science, Center for Reproductive Biology, College of Veterinary Medicine, Washington State University, Pullman, WA, United States
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Gangadhar Jadhav V, Bharath Kumar BS, Pandita S. Age-related changes in testicular parameters and their relationship to thyroid hormones and testosterone in male Murrah buffaloes. Arch Anim Breed 2018. [DOI: 10.5194/aab-61-191-2018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. The present study aims to investigate the age-related changes in testicular
parameters and their association with plasma triiodothyronine (T3),
thyroxine (T4), and testosterone in male Murrah buffaloes. Testicular
measurements and single blood samples were collected from male Murrah
buffaloes (n= 103) aged between 6 months and 8 years. The correlation
coefficients of average testicular length (ATL), paired testis width (PTW),
and scrotal circumference (SC) in relation to age were 0.88, 0.91, and 0.90,
respectively. The regression equation between testicular weight (TW) and age
was Y=1.48×x0.005 (r= 0.90; R2= 0.79). Plasma
T4 and testosterone increased significantly (p< 0.001) with age and
their levels ranged between 12.9 and 41.8 and 0.05 and 1.48 ng mL−1, respectively.
With respect to associations between testicular parameters and plasma hormone
levels, we observed significant (p< 0.01) correlations between ATL, PTW,
SC, TW, and plasma T4. A significant correlation (r= 0.31; p< 0.01) between plasma T4 and testosterone levels was also observed.
However, the correlations between plasma T3 and testicular parameters
and plasma T3 and testosterone were non-significant. From the present
study, we conclude that plasma T4 is positively correlated with
testicular parameters and plasma testosterone, indicating its role in testis
development and steroidogenesis.
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Toishi Y, Tsunoda N, Nagata SI, Kirisawa R, Nagaoka K, Watanabe G, Yanagawa Y, Katagiri S, Taya K. Evaluation of the chemiluminescent enzyme immunoassay system for the measurement of testosterone in the serum and whole blood of stallions. J Reprod Dev 2017; 64:41-47. [PMID: 29129877 PMCID: PMC5830357 DOI: 10.1262/jrd.2017-099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Testosterone (T) concentration is a useful indicator of reproductive function in male animals. However, T concentration is not usually measured in veterinary clinics, partly due to the unavailability of reliable and
rapid assays for animal samples. In this study, a rapid chemiluminescent enzyme immunoassay system (CLEIA system) that was developed for the measurement of T concentration in humans use was validated for stallion blood
samples. First, serum T concentrations were measured using the CLEIA system and compared with those measured by a fluoroimmunoassay that has been validated for use in stallions. The serum T concentrations measured by the
two methods were highly correlated (r = 0.9865, n = 56). Second, to validate the use of whole blood as assay samples, T concentrations in whole blood and in the serum were measured by the CLEIA system. T concentrations
in both samples were highly correlated (r = 0.9665, n = 64). Finally, to evaluate the practical value of the CLEIA system in clinical settings, T concentrations were measured in three stallions with reproductive
abnormalities after the administration of human chorionic gonadotropin (hCG). Two stallions with small or absent testes in the scrotum showed an increase in T production in response to hCG administration and one stallion
with seminoma did not. In conclusion, the CLEIA system was found to be a rapid and reliable tool for measuring T concentrations in stallions and may improve reproductive management in clinical settings and in breeding
studs.
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Affiliation(s)
- Yuko Toishi
- Shadai Stallion Station, Hokkaido 059-1432, Japan.,Laboratory of Veterinary Virology, Department of Pathobiology, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 069-8501, Japan
| | | | - Shun-Ichi Nagata
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Rikio Kirisawa
- Laboratory of Veterinary Virology, Department of Pathobiology, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 069-8501, Japan
| | - Kentaro Nagaoka
- Laboratory of Veterinary Physiology, Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.,United Graduated School of Veterinarian Science, Gifu University, Gifu 501-1193, Japan
| | - Gen Watanabe
- Laboratory of Veterinary Physiology, Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.,United Graduated School of Veterinarian Science, Gifu University, Gifu 501-1193, Japan
| | - Yojiro Yanagawa
- Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0808, Japan
| | - Seiji Katagiri
- Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0808, Japan
| | - Kazuyoshi Taya
- Shadai Stallion Station, Hokkaido 059-1432, Japan.,Laboratory of Veterinary Physiology, Cooperative Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
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Cerny KL, Garbacik S, Skees C, Burris WR, Matthews JC, Bridges PJ. Gestational form of Selenium in Free-Choice Mineral Mixes Affects Transcriptome Profiles of the Neonatal Calf Testis, Including those of Steroidogenic and Spermatogenic Pathways. Biol Trace Elem Res 2016; 169:56-68. [PMID: 26043916 DOI: 10.1007/s12011-015-0386-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 05/26/2015] [Indexed: 12/29/2022]
Abstract
In areas where soils are deficient in Selenium (Se), dietary supplementation of this trace mineral directly to cattle is recommended. Because Se status affects testosterone synthesis and frequency of sperm abnormalities, and the form of Se supplemented to cows affects tissue-specific gene expression, the objective of this study was to determine whether the form of Se consumed by cows during gestation would affect the expression of mRNAs that regulate steroidogenesis and/or spermatogenesis in the neonatal calf testis. Twenty-four predominantly Angus cows were assigned randomly to have individual, ad libitum, access of a mineral mix containing 35 ppm of Se in free-choice vitamin-mineral mixes as either inorganic (ISe), organic (OSe), or a 50/50 mix of ISe and OSe (MIX), starting 4 months prior to breeding and continuing throughout gestation. Thirteen male calves were born over a 3-month period (ISe, n = 5; OSe, n = 4; MIX, n = 4), castrated within 2 days of birth, and extracted testis RNA subjected to transcriptomal analysis by microarray (Affymetrix Bovine 1.0 ST arrays) and targeted gene expression analysis by real-time reverse-transcription PCR (RT-PCR) of mRNAs encoding proteins known to affect steroidogenesis and/or spermatogenesis. The form of dam Se affected (P < 0.05) the expression of 853 annotated genes, including 17 mRNAs putatively regulating steroidogenesis and/or spermatogenesis. Targeted RT-PCR analysis indicated that the expression of mRNA encoding proteins CYP2S1 (cytochrome P450, family 2, subfamily S, polypeptide 1), HSD17B7 (hydroxysteroid (17β) dehydrogenase 7), SULT1E1 (sulfotransferase family 1E, estrogen preferring, member 1), LDHA (lactate dehydrogenase A), CDK5R1 (cyclin-dependent kinase 5, regulatory subunit 1), and LEP (leptin) was affected (P < 0.05) by form of Se consumed by dams of developing bull calves, while AKR1C4 (aldo-keto reductase family 1, member C4) and CCND2 (cyclin D2) tended (P < 0.09) to be affected. Our results indicate that form of Se fed to dams during gestation affected the transcriptome of the neonatal calf testis. If these profiles are maintained throughout maturation, then the form of Se fed to dams may impact bull fertility and the development of Se form-dependent mineral mixes that target gestational development of the testis are warranted.
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Affiliation(s)
- K L Cerny
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - S Garbacik
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - C Skees
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - W R Burris
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - J C Matthews
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - P J Bridges
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY, 40546, USA.
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Monaco D, Fatnassi M, Padalino B, Aubé L, Khorchani T, Hammadi M, Lacalandra GM. Effects of a GnRH administration on testosterone profile, libido and semen parameters of dromedary camel bulls. Res Vet Sci 2015; 102:212-6. [PMID: 26412546 DOI: 10.1016/j.rvsc.2015.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 07/16/2015] [Accepted: 08/24/2015] [Indexed: 11/16/2022]
Abstract
GnRH treatment has been suggested to increase testosterone levels temporarily and to stimulate libido in stallions, but its use has not fully ascertained in dromedary camels. The aim of this work was to study the effects of administering 100 μg of GnRH on testosterone profile, libido and semen parameters in dromedary camels. The same bulls were used as self-controls and experimental group. Blood samples were collected every 20 min (T0-T12) for 4h, and semen collections were performed over a 2-hour period after T12. GnRH was administered immediately after T0. In GnRH-treated bulls, testosterone levels showed an upward trend, peaking after 140 min, and then slowly decreasing. GnRH administration also led to a decrease in mating time and an increase in spermatozoa concentration. Overall, it seems that administration of 100 μg GnRH might increase testosterone levels temporarily and enhance camel reproduction performance.
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Affiliation(s)
- Davide Monaco
- Department of Emergency and Organ Transplantation (D.E.T.O.), Veterinary Clinics and Animal Production Section, University of Bari Aldo Moro, Valenzano, Bari, Italy
| | - Meriem Fatnassi
- Livestock and Wildlife Laboratory, Arid Lands Institute (I.R.A.), University of Gabès, Médenine, Tunisia; Institut Supérieur Agronomique de Chott-Meriem, University of Sousse, Tunisia
| | - Barbara Padalino
- Department of Veterinary Medicine, University of Bari Aldo Moro, Valenzano, Bari, Italy.
| | - Lydiane Aubé
- Laboratoires d'Ethologie Animale et Humaine EthoS, University of Rennes, Rennes, France
| | - Touhami Khorchani
- Livestock and Wildlife Laboratory, Arid Lands Institute (I.R.A.), University of Gabès, Médenine, Tunisia
| | - Mohamed Hammadi
- Livestock and Wildlife Laboratory, Arid Lands Institute (I.R.A.), University of Gabès, Médenine, Tunisia
| | - Giovanni Michele Lacalandra
- Department of Emergency and Organ Transplantation (D.E.T.O.), Veterinary Clinics and Animal Production Section, University of Bari Aldo Moro, Valenzano, Bari, Italy
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Bharath Kumar B, Pandita S, Prakash B, Mallick S, Mohanty T, Mandal D, Mili B. Luteinizing hormone, testosterone and total estrogens response to exogenous GnRH in crossbred bulls with differing semen quality. Livest Sci 2015. [DOI: 10.1016/j.livsci.2015.01.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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