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Broda M, Yelle DJ, Serwańska-Leja K. Biodegradable Polymers in Veterinary Medicine-A Review. Molecules 2024; 29:883. [PMID: 38398635 PMCID: PMC10892962 DOI: 10.3390/molecules29040883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/03/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024] Open
Abstract
During the past two decades, tremendous progress has been made in the development of biodegradable polymeric materials for various industrial applications, including human and veterinary medicine. They are promising alternatives to commonly used non-degradable polymers to combat the global plastic waste crisis. Among biodegradable polymers used, or potentially applicable to, veterinary medicine are natural polysaccharides, such as chitin, chitosan, and cellulose as well as various polyesters, including poly(ε-caprolactone), polylactic acid, poly(lactic-co-glycolic acid), and polyhydroxyalkanoates produced by bacteria. They can be used as implants, drug carriers, or biomaterials in tissue engineering and wound management. Their use in veterinary practice depends on their biocompatibility, inertness to living tissue, mechanical resistance, and sorption characteristics. They must be designed specifically to fit their purpose, whether it be: (1) facilitating new tissue growth and allowing for controlled interactions with living cells or cell-growth factors, (2) having mechanical properties that address functionality when applied as implants, or (3) having controlled degradability to deliver drugs to their targeted location when applied as drug-delivery vehicles. This paper aims to present recent developments in the research on biodegradable polymers in veterinary medicine and highlight the challenges and future perspectives in this area.
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Affiliation(s)
- Magdalena Broda
- Department of Wood Science and Thermal Techniques, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
| | - Daniel J. Yelle
- Forest Biopolymers Science and Engineering, Forest Products Laboratory, USDA Forest Service, One Gifford Pinchot Drive, Madison, WI 53726, USA;
| | - Katarzyna Serwańska-Leja
- Department of Animal Anatomy, Faculty of Veterinary Medicine and Animal Sciences, Poznan University of Life Sciences, Wojska Polskiego 71c, 60-625 Poznan, Poland;
- Department of Sports Dietetics, Poznan University of Physical Education, 61-871 Poznan, Poland
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2
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Reineri PS, Bernhard SDR, Principi SA, Gerlero GD, Aller JF. Effects of two protocols of ovulation synchronization on corpus luteum size and blood flow, progesterone concentration, and pregnancy rate in beef heifers. Anim Reprod Sci 2023; 251:107223. [PMID: 36965397 DOI: 10.1016/j.anireprosci.2023.107223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 03/06/2023] [Accepted: 03/19/2023] [Indexed: 03/27/2023]
Abstract
The objective of this study was to evaluate the effect of 7-day estradiol-progesterone-based [Treat(C)] and 5-day Co-Synch plus progesterone [Treat(Co-Sy)] protocols on ovulation time, pre-ovulatory follicle diameter, corpus luteum (CL) size and blood flow, progesterone (P4) concentration and pregnancy rate (PR) in beef heifers. In Experiment 1, a crossover design was applied (n = 9). For Treat(C), a progesterone intravaginal (PI) device was inserted, plus 2 mg of estradiol benzoate (day 0). On day 7, 500 µg of cloprostenol plus 0.5 mg of estradiol cypionate were administered, and PI was removed. For Treat(Co-Sy), on day 0, a PI was inserted plus 100 µg gonadotropin-releasing hormone (GnRH). On day 5, PI was removed, plus 500 µg of cloprostenol and 100 µg of GnRH were administered at 69-70 h later. From day one to ovulation day, dominant follicle was evaluated by ultrasonography. On days 4 and 8 post-ovulation, CL was evaluated by color Doppler, and P4 concentration was determined by chemiluminescence. In Experiment 2, a split-plot experimental design was used. Protocols followed were the same as in Experiment 1 [Treat(C); n = 310 and Treat(Co-Sy); n = 314]. Heifers were fixed-time artificially inseminated. Pregnancy was determined on day 41. In Experiment 1, the interval between PI removal and ovulation time was different between protocols (P < 0.01). In addition, P4 concentration was related to the CL size (P < 0.001), CL blood flow (P < 0.01) and protocols (P < 0.03). In Experiment 2, PR did not differ between protocols.
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Affiliation(s)
- Pablo Sebastián Reineri
- National Institute of Agricultural Technology (INTA), EEA Santiago del Estero, La Abrita, Santiago del Estero G4206XBK, Argentina; Faculty of Agronomy and Agribusiness (FAyA), National University of Santiago del Estero (UNSE), Santiago del Estero G4206XCP, Argentina.
| | - Sergio Daniel Roldán Bernhard
- National Institute of Agricultural Technology (INTA), EEA Santiago del Estero, La Abrita, Santiago del Estero G4206XBK, Argentina
| | | | - Gustavo Daniel Gerlero
- National Institute of Agricultural Technology (INTA), EEA Santiago del Estero, La Abrita, Santiago del Estero G4206XBK, Argentina
| | - Juan Florencio Aller
- National Institute of Agricultural Technology (INTA), EEA Balcarce, 7620 Balcarce, Buenos Aires, Argentina
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Kamgang VW, Bennett NC, van der Goot AC, Ganswindt A. Endocrine correlates of female reproductive activity in the roan antelope (
Hippotragus equinus
). J Zool (1987) 2022. [DOI: 10.1111/jzo.13031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. W. Kamgang
- Department of Zoology and Entomology, Mammal Research Institute University of Pretoria Hatfield South Africa
| | - N. C. Bennett
- Department of Zoology and Entomology, Mammal Research Institute University of Pretoria Hatfield South Africa
| | | | - A. Ganswindt
- Department of Zoology and Entomology, Mammal Research Institute University of Pretoria Hatfield South Africa
- Endocrine Research Laboratory, Faculty of Natural and Agricultural Sciences University of Pretoria Hatfield South Africa
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Umaña Sedó S, Figueiredo C, Gonzalez T, Duarte G, Ugarte Marin M, Crawford C, Pohler K, Chebel R, Bilby T, Bisinotto R. Evaluation of luteolysis, follicle size, and time to ovulation in Holstein heifers treated with two different analogs and doses of prostaglandin-F2α. J Dairy Sci 2022; 105:5506-5518. [DOI: 10.3168/jds.2021-21487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 02/21/2022] [Indexed: 11/19/2022]
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5
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Macmillan K, Gobikrushanth M, Plastow G, Colazo M. Natural versus induced estrus indicators of Holstein heifers determined by an automated activity monitoring system. Livest Sci 2021. [DOI: 10.1016/j.livsci.2021.104514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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6
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Comparison of two intravaginal progesterone-releasing devices in shortened-timed artificial insemination protocols in beef cattle. Theriogenology 2021; 168:75-82. [PMID: 33862427 DOI: 10.1016/j.theriogenology.2021.03.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 02/23/2021] [Accepted: 03/27/2021] [Indexed: 11/23/2022]
Abstract
Commercially available intravaginal progesterone (P4) devices differ in shape, surface area and P4 load, which may affect the resulting pregnancy per AI (P/AI) following timed-AI (TAI). The objective of this study was to compare two intravaginal P4 devices on estrus rate, follicular dynamics and P/AI in beef cattle subjected to shortened-TAI protocols. In Expt. 1, nulliparous heifers were randomly assigned to a P4-releasing intravaginal device (PRID-Delta, 1.55 g P4) or a controlled internal drug release (CIDR, 1.38 g P4) at the initiation of a J-synch protocol. Heifers that displayed estrus 72 h following device removal were TAI, or if not in estrus given GnRH at 72 h and TAI at 90 h. In Expt. 2, nulliparous heifers and non-suckling cows were randomly assigned to either PRID or CIDR groups and either 1 or 2 mg of estradiol benzoate (EB) at initiation of a J-synch protocol. All cattle were TAI concurrent with GnRH 72 h after device removal. In Expt. 3, nulliparous heifers and suckling cows were randomly assigned to either PRID or CIDR groups and initiated a 5-d Cosynch protocol, with TAI concurrent with GnRH 72 h following device removal. In each experiment, cattle received estrus detection patches at device removal, which were then scored from 0 to 3 based on color change between initial application and TAI; 0 = unchanged, 1 = ≤50% change, 2 = >50% change, 3 = missing. Estrus was defined to have occurred when the patch was scored 2 or 3. Transrectal ultrasonography was used to determine cyclicity, diagnose pregnancy in all experiments, and the size of the ovulatory follicle in Expt. 3. In Expt. 1, the estrus rate was greater (72.0% vs. 61.0%; P = 0.04) in the PRID compared to the CIDR group. In Expt. 2, a parity by EB dose interaction (P = 0.02) was attributed to an increased estrus rate (52.8% vs. 41.4%; P = 0.05) in heifers given 1 vs. 2 mg EB. In Expt. 3, there was no difference in the ovulatory follicle diameter at device removal (P = 0.22) or TAI (P = 0.28) between P4 groups. Treatment with a PRID tended (P = 0.10) to increase the P/AI in cows compared to a CIDR (73.5% vs. 61.0%). In all experiments combined, the overall P/AI tended to increase (55.2% vs. 51.0%; P = 0.08) and P/AI in cattle exhibiting estrus increased (64.4% vs. 59.7%; P = 0.02) in cattle given a PRID compared to those given a CIDR, respectively. In summary, the type of intravaginal P4 device affected estrus response and P/AI following TAI in beef cows.
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Silva Filho ML, Ferreira-Silva JC, Vieira JIT, Basto SRL, Chaves MS, Luz JB, Alves KS, Bartolomeu CC, Oliveira MAL. Influence of the male effect on follicular dynamics and pregnancy rate in lactating cows undergoing fixed-time artificial insemination. Livest Sci 2020. [DOI: 10.1016/j.livsci.2020.104148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Nguyen LT, Zacchi LF, Schulz BL, Moore SS, Fortes MRS. Adipose tissue proteomic analyses to study puberty in Brahman heifers. J Anim Sci 2018; 96:2392-2398. [PMID: 29788311 DOI: 10.1093/jas/sky128] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/17/2018] [Indexed: 12/31/2022] Open
Abstract
The adipose tissue has been recognized as an active endocrine organ which can modulate numerous physiological processes such as metabolism, appetite, immunity, and reproduction. The aim of this study was to look for differentially abundant proteins and their biological functions in the abdominal adipose tissue between pre- and postpubertal Brahman heifers. Twelve Brahman heifers were divided into 2 groups and paired on slaughter day. Prepubertal heifers had never ovulated and postpubertal heifers were slaughtered on the luteal phase of their second estrous cycle. After ensuring the occurrence of puberty in postpubertal heifers, abdominal adipose tissue samples were collected. Mass spectrometry proteomic analysis identified 646 proteins and revealed that 171 proteins showed differential abundance in adipose tissue between the pre- and postpuberty groups (adjusted P-value < 0.05). Data are available via ProteomeXchange with identifier PXD009452. Using a list of 51 highly differentially abundant proteins as the target (adjusted P-value < 10-5), we found 14 enriched pathways. The results indicated that gluconeogenesis was enhanced when puberty approached. The metabolism of glucose, lipids, and AA in the adipose tissue mainly participated in oxidation and energy supply for heifers when puberty occurred. Our study also revealed the differentially abundant proteins were enriched for estrogen signaling and PI3K-Akt signaling pathways, which are known integrators of metabolism and reproduction. These results suggest new candidate proteins that may contribute to a better understanding of the signaling mechanisms that relate adipose tissue function to puberty. Protein-protein interaction network analysis identified 4 hub proteins that had the highest degrees of connection: PGK1, ALDH5A1, EEF2, and LDHB. Highly connected proteins are likely to influence the functions of all differentially abundant proteins identified, directly or indirectly.
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Affiliation(s)
- L T Nguyen
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia.,Faculty of Biotechnology, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - L F Zacchi
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia.,Australian Research Council Training Centre for Biopharmaceutical Innovation, Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia
| | - B L Schulz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia.,Australian Research Council Training Centre for Biopharmaceutical Innovation, Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia
| | - S S Moore
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Australia
| | - M R S Fortes
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
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Preparation of TPP-crosslinked chitosan microparticles by spray drying for the controlled delivery of progesterone intended for estrus synchronization in cattle. Pharm Res 2018; 35:66. [PMID: 29464352 DOI: 10.1007/s11095-018-2363-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 02/06/2018] [Indexed: 10/18/2022]
Abstract
PURPOSE Planned reproduction in cattle involves regulation of estrous cycle and the use of artificial insemination. Cycle control includes the administration of exogenous progesterone during 5-8 days in a controlled manner allowing females to synchronize their ovulation. Several progesterone delivery systems are commercially available but they have several drawbacks. The aim of the present contribution was to evaluate chitosan microparticles entrapping progesterone as an alternative system. METHODS Microparticles were prepared by spray drying. The effect of formulation parameters and experimental conditions on particle features and delivery was studied. A mathematical model to predict progesterone plasma concentration in animals was developed and validated with experimental data. RESULTS Microparticle size was not affected by formulation parameters but sphericity enhances as Tween 80 content increases and it impairs as TPP content rises. Z potential decreases as phosphate content rises. Particles remain stable in acidic solution but the addition of surfactant is required to stabilize dispersions in neutral medium. Encapsulation efficiencies was 69-75%. In vitro delivery studies showed burst and diffusion-controlled phases, being progesterone released faster at low pH. In addition, delivery extend in cows was affected mainly by particle size and hormone initial content, while the amount injected altered plasma concentration. Theoretical predictions with excellent accuracy were obtained. CONCLUSION The mathematical model developed can help to find proper particle features to reach specific delivery rates in the animals. This not only save time, money and effort but also minimized experimentation with animals which is desired from an ethical point of view.
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10
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The effect of cooling management on blood flow to the dominant follicle and estrous cycle length at heat stress. Theriogenology 2016; 86:626-34. [PMID: 27025442 DOI: 10.1016/j.theriogenology.2016.02.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 02/16/2016] [Accepted: 02/19/2016] [Indexed: 11/23/2022]
Abstract
The use of ultrasound imaging for the examination of reproductive organs has contributed substantially to the fertility management of dairy cows around the world. This method has many advantages such as noninvasiveness and immediate availability of information. Adding Doppler index to the ultrasound imaging examination, improved the estimation of blood volume and flow rate to the ovaries in general and to the dominant follicle in particular. The aim of this study was to examine changes in the blood flow to the dominant follicle and compare them to the follicular development throughout the cycle. We further set out to examine the effects of different types of cooling management during the summer on the changes in blood flow to the dominant follicle. For this purpose, 24 Israeli-Holstein dairy cows, under heat stress, were randomly assigned one of two groups: one was exposed to five cooling sessions per day (5CS) and the other to eight cooling sessions per day (8CS). Blood flow to the dominant follicle was measured daily using Doppler index throughout the estrous cycle. No differences in the preovulatory dominant follicle diameter were detected between the two cooling management regimens during the cycle. However, the length of the first follicular wave was significantly longer, whereas the second follicular wave was nonsignificantly shorter in the 5CS group as compared to the 8CS group. In addition, no difference in blood flow was found during the first 18 days of the cycle between the two groups. However, from Day 20 until ovulation a higher rate of blood flow was measured in the ovaries of cows cooled 8 times per day as compared to the 5CS group. No differences in progesterone levels were noted. Finally, the estrous cycle length was shorter in the 8CS group as compared to the 5CS group. Our data suggest that blood flow to the dominant follicle and estrous cycle length is affected by heat stress. Using the appropriate cooling management during heat stress can enhance the blood flow to the ovary and may contribute to improved fertility in dairy cows.
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11
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Santos-Neto PD, García-Pintos C, Pinczak A, Menchaca A. Fertility obtained with different progestogen intravaginal devices using Short-term protocol for fixed-time artificial insemination (FTAI) in sheep. Livest Sci 2015. [DOI: 10.1016/j.livsci.2015.11.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Dadarwal D, Adams GP, Hyttel P, Brogliatti GM, Caldwell S, Singh J. Organelle reorganization in bovine oocytes during dominant follicle growth and regression. Reprod Biol Endocrinol 2015; 13:124. [PMID: 26577904 PMCID: PMC4650271 DOI: 10.1186/s12958-015-0122-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 11/02/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND We tested the hypothesis that organelles in bovine oocytes undergo changes in number and spatial distribution in a manner specific for phase of follicle development. METHODS Cumulus-oocyte-complexes were collected from Hereford heifers by ultrasound-guided follicle aspiration from dominant follicles in the growing phase (n = 5; Day 0 = ovulation), static phase (n = 5), regressing phase (n = 7) of Wave 1 and from preovulatory follicles (n = 5). Oocytes were processed and transmission electron micrographs of ooplasm representing peripheral, perinuclear and central regions were evaluated using standard stereological methods. RESULTS The number of mitochondria and volume occupied by lipid droplets was higher (P < 0.03) in oocytes from regressing follicles (193.0 ± 10.4/1000 μm(3) and 3.5 ± 0.7 %) than growing and preovulatory stages (118.7 ± 14.4/1000 μm(3) and 1.1 ± 0.3 %; 150.5 ± 28.7/1000 μm(3) and 1.6 ± 0.2 %, respectively). Oocytes from growing, static and preovulatory follicles had >70 % mitochondria in the peripheral regions whereas oocytes from regressing follicles had an even distribution. Oocytes from growing follicles had more lipid droplets in peripheral region than in central region (86.9 vs. 13.1 %). Percent surface area of mitochondria in contact with lipid droplets increased from growing (2.3 %) to static, regressing or preovulatory follicle stage (8.9, 6.1 and 6.2 %). The amount, size and distribution of other organelles did not differ among phases (P > 0.11). CONCLUSIONS Our hypothesis was supported in that mitochondrial number increased and translocation occurred from a peripheral to an even distribution as follicles entered the regressing phase. In addition, lipid droplets underwent spatial reorganization from a peripheral to an even distribution during the growing phase and mitochondria-lipid contact area increased with follicle maturation.
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Affiliation(s)
- D Dadarwal
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, S7N 5B4, Canada.
| | - G P Adams
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, S7N 5B4, Canada.
| | - P Hyttel
- Department of Veterinary Clinical and Animal Sciences, University of Copenhagen, Groennegaardsvej 7, DK-1870, Frederiksberg C, Denmark.
| | - G M Brogliatti
- Universidad Católica de Córdoba, Reproduccion animal, Cordoba, X5000IYG, Argentina.
| | - S Caldwell
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, S7N 5B4, Canada.
| | - Jaswant Singh
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, S7N 5B4, Canada.
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Sales J, Carvalho J, Crepaldi G, Soares J, Girotto R, Maio J, Souza J, Baruselli P. Effect of circulating progesterone concentration during synchronization for fixed-time artificial insemination on ovulation and fertility in Bos indicus (Nelore) beef cows. Theriogenology 2015; 83:1093-100. [DOI: 10.1016/j.theriogenology.2014.12.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 12/05/2014] [Accepted: 12/06/2014] [Indexed: 10/24/2022]
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Bisinotto RS, Pansani MB, Castro LO, Narciso CD, Sinedino LDP, Martinez N, Carneiro PE, Thatcher WW, Santos JEP. Effect of progesterone supplementation on fertility responses of lactating dairy cows with corpus luteum at the initiation of the Ovsynch protocol. Theriogenology 2014; 83:257-65. [PMID: 25442385 DOI: 10.1016/j.theriogenology.2014.09.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/11/2014] [Accepted: 09/12/2014] [Indexed: 11/29/2022]
Abstract
The objectives of this study were to determine the effects of supplemental progesterone on fertility responses of lactating dairy cows with a CL at the initiation of the timed artificial insemination (AI) program. Holstein cows were subjected to the Ovsynch protocol (Day -10 GnRH, Day -3 PGF2α, Day -0.7 GnRH, and Day 0 timed AI). Ovaries were scanned by ultrasonography on Day -10 and cows with CL were blocked by pen and assigned randomly to receive no supplemental progesterone (control, n = 863) or to receive a controlled internal drug-release (CIDR) insert containing progesterone from Days -10 to -3 (1CIDR, n = 862). Cows were observed for signs of estrus beginning on Day -9 based on removal of tail chalk and those in estrus received AI on the same day. Blood sampled from a subset of cows was analyzed for progesterone concentrations on Days -10, -9, -7, -5, -3, 0, 6, 13, and 19. Pregnancy was diagnosed on Days 32 and 60 after AI. Supplementation increased (P < 0.01) progesterone concentrations between Day -9 and -3 compared with control (7.5 vs. 6.2 ng/mL). Treatment had no effect on the ovulatory response to the first and final GnRH injections of the Ovsynch protocol, the proportion of cows that maintained their CL until the day of PGF2α injection, or the diameter of the ovulatory follicle before AI. Although the overall proportion of cows in estrus at AI did not differ between treatments, progesterone supplementation prevented (P < 0.01) cows from coming into estrus from Days -9 to -3 (0.0% vs. 4.7%), whereas it increased (P = 0.02) the proportion of cows inseminated in estrus from Days -2 to -1 (7.1% vs. 4.5%). Pregnancy per AI (P/AI) tended to be reduced (P = 0.06) by supplemental progesterone on Day 32 (40.5% vs. 45.0%), but not on Day 60 after AI (36.6% vs. 39.7%). A tendency for an interaction (P = 0.09) between treatment and the presence of CL at the PGF2α injection was observed for P/AI on Day 32 in cows that received timed AI because progesterone supplementation reduced P/AI in cows that maintained their CL until Day -3 (40.3% vs. 46.7%); however, it increased P/AI in those that did not have a CL at PGF2α (38.1% vs. 27.7%). Treatment did not affect pregnancy loss between Days 32 and 60 of gestation. In conclusion, incorporating a single intravaginal insert to the timed AI program increased progesterone concentrations in plasma by 1.3 ng/mL, but did not benefit fertility in dairy cows that have CL at the initiation of the synchronization protocol.
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Affiliation(s)
- R S Bisinotto
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - M B Pansani
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - L O Castro
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - C D Narciso
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - L D P Sinedino
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - N Martinez
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - P E Carneiro
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - W W Thatcher
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - J E P Santos
- Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA.
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Samadi F, Blache D, Martin G, D’Occhio M. Nutrition, metabolic profiles and puberty in Brahman (Bos indicus) beef heifers. Anim Reprod Sci 2014; 146:134-42. [DOI: 10.1016/j.anireprosci.2014.03.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 03/04/2014] [Accepted: 03/09/2014] [Indexed: 11/30/2022]
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16
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Carvalho N, Soares J, Souza D, Vannucci F, Amaral R, Maio J, Sales J, Sá Filho M, Baruselli P. Different circulating progesterone concentrations during synchronization of ovulation protocol did not affect ovarian follicular and pregnancy responses in seasonal anestrous buffalo cows. Theriogenology 2014; 81:490-5. [DOI: 10.1016/j.theriogenology.2013.11.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 11/01/2013] [Accepted: 11/05/2013] [Indexed: 11/27/2022]
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17
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Prostaglandin treatment at the onset of norgestomet and estradiol-based synchronization protocols did not alter the ovarian follicular dynamics or pregnancy per timed artificial insemination in cyclic Bos indicus heifers. Anim Reprod Sci 2014; 144:1-5. [DOI: 10.1016/j.anireprosci.2013.11.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 11/06/2013] [Accepted: 11/22/2013] [Indexed: 11/24/2022]
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van Werven T, Waldeck F, Souza A, Floch S, Englebienne M. Comparison of two intravaginal progesterone releasing devices (PRID-Delta vs CIDR) in dairy cows: Blood progesterone profile and field fertility. Anim Reprod Sci 2013; 138:143-9. [DOI: 10.1016/j.anireprosci.2013.02.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 01/31/2013] [Accepted: 02/10/2013] [Indexed: 11/27/2022]
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19
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Dadarwal D, Mapletoft R, Adams G, Pfeifer L, Creelman C, Singh J. Effect of progesterone concentration and duration of proestrus on fertility in beef cattle after fixed-time artificial insemination. Theriogenology 2013; 79:859-66. [DOI: 10.1016/j.theriogenology.2013.01.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 01/03/2013] [Accepted: 01/03/2013] [Indexed: 11/30/2022]
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20
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Ginther OJ, Pinaffi FLV, Khan FA, Duarte LF, Beg MA. Follicular-phase concentrations of progesterone, estradiol-17β, LH, FSH, and a PGF2α metabolite and daily clustering of prolactin pulses, based on hourly blood sampling and hourly detection of ovulation in heifers. Theriogenology 2013; 79:918-28. [PMID: 23434204 DOI: 10.1016/j.theriogenology.2012.12.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 12/27/2012] [Accepted: 12/27/2012] [Indexed: 12/17/2022]
Abstract
Circulating concentrations of hormones were determined each hour in 13 heifers from the end of the luteolytic period to ovulation (follicular phase, 3.5 days). Diameter of the preovulatory follicle was determined every 8 hours, and the time of ovulation was determined hourly. The diameter of the preovulatory follicle decreased 0.8 ± 0.1 mm/h in heifers when there was 1 to 3 hours between the last two diameter measurements before ovulation. The concentration of progesterone (P4) after the end of the luteolytic period (P4 < 1 ng/mL) changed (P < 0.0001), as shown by a continued decrease until Hour -57 (Hour 0 = ovulation), then was maintained at approximately 0.2 ng/mL until 2 hours before the peak of the LH surge at Hour -26, and then a decrease to 0.1 ng/mL along with a decrease in estradiol-17β. Concentrations of LH gradually increased (P < 0.007) and concentrations of FSH gradually decreased (P < 0.0001) after the end of luteolysis until the beginning nadirs of the respective preovulatory surges. A cluster of prolactin (PRL) pulses occurred (P < 0.0001) each day with approximately 24 hours between the maximum value of successive clusters. Hourly concentrations of a PGF2α metabolite decreased (P < 0.007) until Hour -40, but did not differ among hours thereafter. Novel observations included the gradual increase in LH and decrease in FSH until the beginning of the preovulatory surges and follicle diameter decrease a few hours before ovulation. Results supported the following hypotheses: (1) change in the low circulating P4 concentrations during the follicular phase are temporally associated with change in LH concentrations; and (2) PRL pulses occur in a cluster each day during the follicular phase of the estrous cycle.
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Affiliation(s)
- O J Ginther
- Eutheria Foundation, Cross Plains, Wisconsin, USA.
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21
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Stötzel C, Plöntzke J, Heuwieser W, Röblitz S. Advances in modeling of the bovine estrous cycle: synchronization with PGF2α. Theriogenology 2012; 78:1415-28. [PMID: 22980082 DOI: 10.1016/j.theriogenology.2012.04.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Revised: 04/25/2012] [Accepted: 04/26/2012] [Indexed: 10/27/2022]
Abstract
Our model of the bovine estrous cycle is a set of ordinary differential equations which generates hormone profiles of successive estrous cycles with several follicular waves per cycle. It describes the growth and decay of the follicles and the corpus luteum, as well as the change of the key reproductive hormones, enzymes and processes over time. In this work we describe recent developments of this model towards the administration of prostaglandin F2α. We validate our model by showing that the simulations agree with observations from synchronization studies and with measured progesterone data after single dose administrations of synthetic prostaglandin F2α.
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Affiliation(s)
- C Stötzel
- Computational Systems Biology Group, Numerical Analysis and Modeling, Zuse Institute Berlin, Takustr. 7, 14195 Berlin, Germany.
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23
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Role of LH in luteolysis and growth of the ovulatory follicle and estradiol regulation of LH secretion in heifers. Theriogenology 2012; 77:1442-52. [DOI: 10.1016/j.theriogenology.2011.11.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/15/2011] [Accepted: 11/19/2011] [Indexed: 11/18/2022]
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24
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Nordéus K, Båge R, Gustafsson H, Söderquist L. Changes in LH pulsatility profiles in dairy heifers during exposure to oestrous urine and vaginal mucus. Reprod Domest Anim 2012; 47:952-8. [PMID: 22390462 PMCID: PMC3533760 DOI: 10.1111/j.1439-0531.2012.01997.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Difficulty in observing oestrus is a problem for many dairy farmers performing AI. Finding ways to synchronize oestrous cycles or strengthen display of oestrus without hormonal treatments would be of great interest because many consumers object to the use of exogenous hormones on healthy animals. Modification of reproductive cycles through chemical communication has been reported in several species including cattle. LH is an important regulator of the follicular phase and could possibly be subject to pheromonal influence. This study focuses on the effect of volatile compounds from oestrous substances on LH pulsatility preceding the preovulatory LH surge in cattle. Four heifers of the Swedish Red breed were kept individually in isolation. Exposure to water during the control cycle (CC), and bovine oestrous urine and vaginal mucus during the treated cycle (TC), started simultaneously with induction of oestrus. Blood sampling at 15-min intervals started 37 h after administration of PGF2α and continued for 8 h. Monitoring of reproductive hormones, visual oestrus detection and ultrasonographic examination of the ovaries continued until ovulation had occurred. The mean concentration of LH at pulse nadir was significantly higher during TC (2.04 ± 0.18 ng/ml) than during CC (1.79 ± 0.16 ng/ml), and peak amplitude was significantly higher during CC (Δ1.03 ± 0.09) than during TC (Δ0.87 ± 0.09). No other parameters differed significantly between the two cycles. We conclude that the difference in LH pulsatility pattern may be an effect of exposing heifers to oestrous vaginal mucus and/or urine and that the mechanism behind this needs further investigation.
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Affiliation(s)
- K Nordéus
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
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25
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Jing J, Qiao Q, Jin Y, Ma C, Cai H, Meng Y, Cai Z, Feng D. Molecular and Mesoscopic Dynamics Simulations on the Compatibility of PLA/Plasticizer Blends. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201180454] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Sakatani M, Balboula AZ, Yamanaka K, Takahashi M. Effect of summer heat environment on body temperature, estrous cycles and blood antioxidant levels in Japanese Black cow. Anim Sci J 2011; 83:394-402. [PMID: 22574791 DOI: 10.1111/j.1740-0929.2011.00967.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This study investigated the effect of summer heat environment on estrous cycles and blood antioxidant levels in Japanese Black cows. A total of 13 non-lactating Japanese Black cows (summer: 9, winter: 4) were examined. Body temperature was measured rectally and intravaginally using a thermometer and data logger, respectively. Estrous behavior was monitored using a radiotelemetric pedometer that recorded walking activity. Rectal temperatures were higher during summer than winter (P<0.001). There was an acute increase in vaginal temperature at the onset of estrus during winter but such an increase was not observed during summer. Walking activity during estrus decreased dramatically in the summer compared to the winter. Duration of estrous cycle was longer in summer (23.4 days, P<0.05) than winter (21.5 days), and the subsequent rise in progesterone concentrations following estrus tended to be delayed in summer. The level of thiobarbituric acid reactive substances (TBARS) in peripheral blood cells was higher during summer (P<0.05), while the levels of superoixde dismutase (SOD), glutathione peroxidase (GPx) and glutathione were lower (P<0.05). These results indicate that high ambient temperature during summer increases both body temperature and oxidative stress, and also reduces signs of estrus in Japanese Black cows.
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Affiliation(s)
- Miki Sakatani
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Koshi, Kumamoto, Japan.
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Sá Filho M, Baldrighi J, Sales J, Crepaldi G, Carvalho J, Bó G, Baruselli P. Induction of ovarian follicular wave emergence and ovulation in progestin-based timed artificial insemination protocols for Bos indicus cattle. Anim Reprod Sci 2011; 129:132-9. [DOI: 10.1016/j.anireprosci.2011.12.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2010] [Revised: 12/06/2011] [Accepted: 12/12/2011] [Indexed: 10/14/2022]
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28
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Ginther O, Fuenzalida MJ, Hannan MA, Beg MA. Pulsatility and Interrelationships of 13,14-Dihydro-15-Keto-PGF2alpha (PGFM), Luteinizing Hormone, Progesterone, and Estradiol in Heifers1. Biol Reprod 2011; 84:922-32. [DOI: 10.1095/biolreprod.110.089953] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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29
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Bisinotto RS, Ribeiro ES, Martins LT, Marsola RS, Greco LF, Favoreto MG, Risco CA, Thatcher WW, Santos JEP. Effect of interval between induction of ovulation and artificial insemination (AI) and supplemental progesterone for resynchronization on fertility of dairy cows subjected to a 5-d timed AI program. J Dairy Sci 2011; 93:5798-808. [PMID: 21094752 DOI: 10.3168/jds.2010-3516] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 09/12/2010] [Indexed: 11/19/2022]
Abstract
Objectives were to investigate 2 intervals from induction of ovulation to artificial insemination (AI) and the effect of supplemental progesterone for resynchronization on fertility of lactating dairy cows subjected to a 5-d timed AI program. In experiment 1, 1,227 Holstein cows had their estrous cycles presynchronized with 2 injections of PGF(2α) at 46 and 60 d in milk (DIM). The timed AI protocols were initiated with GnRH at 72 DIM, followed by 2 injections of PGF(2α) at 77 and 78 DIM and a second injection of GnRH at either 56 (OVS56) or 72h (COS72) after the first PGF(2α) of the timed AI protocols. All cows were time-inseminated at 72h after the first PGF(2α) injection. Pregnancy was diagnosed on d 32 and 60 after AI. In experiment 2, 675 nonpregnant Holstein cows had their estrous cycles resynchronized starting at 34 d after the first AI. Cows received the OVS56 with (RCIDR) or without (RCON) supplemental progesterone, as an intravaginal insert, from the first GnRH to the first PGF(2α). Pregnancy diagnoses were performed on d 32 and 60 after AI. During experiment 2, subsets of cows had their ovaries scanned by ultrasonography at the first GnRH, the first PGF(2α), and second GnRH injections of the protocol. Blood was sampled on the day of AI and 7 d later, and concentrations of progesterone were determined in plasma. Cows were considered to have a synchronized ovulation if they had progesterone <1 and >2.26 ng/mL on the day of AI and 7 d later, respectively, and if no ovulation was detected between the first PGF(2α) and second GnRH injections during resynchronization. In experiment 1, the proportion of cows detected in estrus at AI was greater for COS72 than OVS56 (40.6 vs. 32.4%). Pregnancy per AI (P/AI) did not differ between OVS56 (46.4%) and COS72 (45.5%). In experiment 2, cows supplemented with progesterone had greater P/AI compared with unsupplemented cows (51.3 vs. 43.1%). Premature ovulation tended to be greater for RCON than RCIDR cows (7.5 vs. 3.6%), although synchronization of the estrous cycle after timed AI was similar between treatments. Timing of induction of ovulation with GnRH relative to insemination did not affect P/AI of dairy cows enrolled in a 5-d timed AI program. Furthermore, during resynchronization starting on d 34 after the first AI, supplementation with progesterone improved P/AI in cows subjected to the 5-d timed AI protocol.
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Affiliation(s)
- R S Bisinotto
- Department of Animal Sciences, University of Florida, Gainesville 32611, USA
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30
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A simple pharmacokinetic model linking plasma progesterone concentrations with the hormone released from bovine intravaginal inserts. Res Vet Sci 2010; 89:250-6. [DOI: 10.1016/j.rvsc.2010.02.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Revised: 12/22/2009] [Accepted: 02/16/2010] [Indexed: 11/15/2022]
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31
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de Mello Bianchi PH, Serafini P, Monteiro da Rocha A, Assad Hassun P, Alves da Motta EL, Sampaio Baruselli P, Chada Baracat E. Review: Follicular Waves in the Human Ovary: A New Physiological Paradigm for Novel Ovarian Stimulation Protocols. Reprod Sci 2010; 17:1067-76. [DOI: 10.1177/1933719110366483] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Paulo Homem de Mello Bianchi
- Huntington Medicina Reprodutiva, São Paulo, Brazil, Disciplina de Ginecologia, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil,
| | - Paulo Serafini
- Huntington Medicina Reprodutiva, São Paulo, Brazil, Disciplina de Ginecologia, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | | | | | - Eduardo Leme Alves da Motta
- Huntington Medicina Reprodutiva, São Paulo, Brazil, Departamento de Ginecologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Pietro Sampaio Baruselli
- Departamento de Reprodução Animal, Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo, São Paulo, Brazil
| | - Edmund Chada Baracat
- Disciplina de Ginecologia, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
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Equine chorionic gonadotropin improves the efficacy of a progestin-based fixed-time artificial insemination protocol in Nelore (Bos indicus) heifers. Anim Reprod Sci 2010; 118:182-7. [DOI: 10.1016/j.anireprosci.2009.10.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2009] [Revised: 10/05/2009] [Accepted: 10/16/2009] [Indexed: 11/17/2022]
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Abstract
Delivery of biologically active agents to animals is often perceived to be the poor relation of human drug delivery. Yet this field has a long and successful history of species-specific device and formulation development, ranging from simple approaches and devices used in production animals to more sophisticated formulations and approaches for a wide range of species. While several technologies using biodegradable polymers have been successfully marketed in a range of veterinary and human products, the transfer of delivery technologies has not been similarly applied across species. This may be due to a combination of specific technical requirements for use of devices in different species, inter-species pharmacokinetic, pharmacodynamic and physiological differences, and distinct market drivers for drug classes used in companion and food-producing animals. This chapter reviews selected commercialised and research-based parenteral and non-parenteral veterinary drug delivery technologies in selected domestic species. Emphasis is also placed on the impact of endogenous drug transporters on drug distribution characteristics in different species. In vitro models used to investigate carrier-dependent transport are reviewed. Species-specific expression of transporters in several tissues can account for inter-animal or inter-species pharmacokinetic variability, lack of predictability of drug efficacy, and potential drug-drug interactions.
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Affiliation(s)
- David J Brayden
- School of Agriculture, Food Science and Veterinary Medicine, University College Dublin (UCD) and UCD Conway Institute, Belfield, Dublin 4, Ireland.
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Lima F, Marques Jr AP, Douglas R, Houri Neto M. Concentração sérica de progesterona em bezerras da raça nelore e mestiças tratadas com progesterona em veículo de liberação lenta. ARQ BRAS MED VET ZOO 2007. [DOI: 10.1590/s0102-09352007000300008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Avaliaram-se a eliminação da progesterona em veículo de liberação lenta (P4LA) em animais zebus e mestiços e sua potencial aplicabilidade em programas de sincronização de estro, utilizando-se 60 bezerras, 30 da raça Nelore e 30 mestiças (Gir x Holandês), entre 120 e 150 dias de idade e peso médio de 150kg. Em cada grupo experimental as bezerras foram divididas em três subgrupos (G) de 10 animais, sendo GI = controle (tratado com 5ml de solução fisiológica por via intramuscular); GII = tratado com 450mg P4LA (3ml IM); e GIII = tratado com 750mg P4LA (5ml IM). Amostras de sangue foram coletadas no dia zero, 7 e 13 (D0, D7 e D13) e procedeu-se à análise hormonal por radioimunoensaio de fase sólida. A progesterona de ação prolongada (P4LA), administrada por via intramuscular, manteve-se por 13 dias na corrente sangüínea em concentrações superiores a 1ng/ml. As doses de 450mg e 750mg de P4LA não ocasionaram efeitos adversos sistêmicos clinicamente perceptíveis, e o metabolismo da P4LA foi mais lento nas bezerras Nelore, cuja concentração de progesterona foi maior na corrente sangüínea do que nas bezerras mestiças.
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Wheaton CJ, Joseph S, Reid K, Webster T, Richards M, Forde HM, Savage A. Suppression of ovulation in Nile Hippopotamus (Hippopotamus amphibious) using melengestrol acetate-treated feed or high dose Depo-Provera injection. Zoo Biol 2007; 26:259-74. [DOI: 10.1002/zoo.20121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cross PS, Künnemeyer R, Bunt CR, Carnegie DA, Rathbone MJ. Control, communication and monitoring of intravaginal drug delivery in dairy cows. Int J Pharm 2004; 282:35-44. [PMID: 15336380 DOI: 10.1016/j.ijpharm.2004.05.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2002] [Revised: 04/08/2003] [Accepted: 05/13/2004] [Indexed: 11/29/2022]
Abstract
We present the design of an electronically controlled drug delivery system. The intravaginally located device is a low-invasive platform that can measure and react inside the cow vagina while providing external control and monitoring ability. The electronics manufactured from off the shelf components occupies 16 mL of a Theratron syringe. A microcontroller reads and logs sensor data and controls a gascell. The generated gas pressure propels the syringe piston and releases the formulation. A two way radio link allows communication between other devices or a base station. Proof of principle experiments confirm variable-rate, arbitrary profile drug delivery qualified by internal sensors. A total volume of 30 mL was dispensed over a 7-day-period with a volume error of +/- 1 mL or +/- 7% for larger volumes. Delivery was controlled or overridden via the wireless link, and proximity to other devices was detected and recorded. The results suggest that temperature and activity sensing or social grouping determined via proximity can be used to detect oestrus and trigger appropriate responses.
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Affiliation(s)
- Peter S Cross
- Department of Physics and Electronic Engineering, University of Waikato, Private Bag 3105, Hamilton, New Zealand.
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37
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Senel S, McClure SJ. Potential applications of chitosan in veterinary medicine. Adv Drug Deliv Rev 2004; 56:1467-80. [PMID: 15191793 DOI: 10.1016/j.addr.2004.02.007] [Citation(s) in RCA: 269] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2003] [Accepted: 02/18/2004] [Indexed: 10/26/2022]
Abstract
Chitosan is a partially deacetylated polymer obtained from the alkaline deacetylation of chitin which is a glucose-based unbranched polysaccharide widely distributed in nature as the principal component of exoskeletons of crustaceans and insects as well as of cell walls of some bacteria and fungi. Chitosan exhibits a variety of physicochemical and biological properties resulting in numerous applications in fields such as waste and water treatment, agriculture, fabric and textiles, cosmetics, nutritional enhancement, and food processing. In addition to its lack of toxicity and allergenicity, and its biocompatibility, biodegradability and bioactivity make it a very attractive substance for diverse applications as a biomaterial in pharmaceutical and medical fields, where it has been used for systemic and local delivery of drugs and vaccines. It also has bioactive properties in its own right. This paper reviews current veterinary applications for chitosan including wound healing, bone regeneration, analgesic and antimicrobial effects. It also discusses the potential application of chitosan to drug and vaccine delivery in veterinary species. Given the restrictions imposed by financial and animal restraint considerations, especially in farming applications, the veterinary drug delivery areas most likely to benefit from chitosan are the delivery of chemotherapeutics such as antibiotics, antiparasitics, anaesthetics, painkillers and growth promotants to mucosal epithelium for absorption for local or systemic activity, and the delivery of immunomodulatory agents to the mucosal associated lymphoid tissue for induction or modulation of local immune responses. The properties of chitosan expected to enhance these functions are discussed, and the future research directions in this field are indicated.
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Affiliation(s)
- Sevda Senel
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, 06100 Ankara, Turkey.
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