Human chorionic gonadotropin affects original (ovulatory) and induced (accessory) corpora lutea,progesterone concentrations,and pregnancy rates in anestrous dairy goats |
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| Affiliation: | 1. Departamento de Medicina Veterinária, Universidade Federal de Viçosa, Av. Peter Henry Rolfs, s/n, CEP 36570-000, Viçosa, MG, Brazil;2. Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900, Jaboticabal, SP, Brazil;3. Departamento de Reprodução e Avaliação Animal, Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, Km7, s/n, CEP 23890-000, Seropédica, RJ, Brazil;4. Instituto de Medicina Veterinária, Universidade Federal do Pará, Av. dos Universitários, s/n, CEP 68746-360, Castanhal, PA, Brazil;5. Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, n° 2000, CEP 28013-642, Campos dos Goytacazes, RJ, Brazil;6. Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, Ontario, N1G 2W1, Canada;7. Embrapa Caprinos e Ovinos, Estrada Sobral/Groaíras, km 04, CP 145, CEP 62010-970, Sobral, CE, Brazil;1. Department of Science and Education, The Reproductive Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530021, Guangxi, PR China;2. The Reproductive Medical Center, The Second Nanning People’s Hospital, Nanning, 530031, Guangxi, PR China;3. Department of Reproductive Medicine, The Reproductive Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530021, Guangxi, PR China;4. Department of Clinical Laboratory, The Reproductive Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530021, Guangxi, PR China;5. Guangxi University of Chinese Medicine, Nanning, 530200, Guangxi, PR China;1. Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran;2. Institute of Pharmacology and Toxicology, University Medical Center, Georg August University, Göttingen, Germany;3. Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran;1. Department of Gynecology, Henan Provincial People’s Hospital; People’s Hospital of Zhengzhou University; People’s Hospital of Henan University, Zhengzhou, 450003, Henan, China;2. Department of Gynecology, Zhou kou Central Hospital, Zhoukou 466000, Henan, China;3. Department of Obstetrics and Gynecology, Zhoukou Maternal and Child Health Care, Zhoukou, 466000, Henan, China;1. College of Animal Science and Technology, Beijing University of Agriculture, Beijing, 102206, China;2. College of Economics and Management, Beijing University of Agriculture, Beijing, 102206, China;3. China National Biotec Group Company Limited, Beijing, 102206, China;1. Department of Laboratory, The Affiliated Changzhou Second People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China;2. Department of Gynecology, The Affiliated Changzhou Second People’s Hospital of Nanjing Medical University, Changzhou, Jiangsu, China |
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| Abstract: | Two experiments were conducted in acyclic Alpine (A) and Saanen (S) goats that received intravaginal sponges containing 60 mg of medroxyprogesterone acetate for 6 days, as well as 200 IU of eCG and 30 μg d-cloprostenol i.m. 24 h before sponge removal. On day 7 (day 0 = onset of synchronized estrus), all goats were randomly divided into two groups: animals treated with 300 IU of hCG i.m. (hCG; Exp.1: n = 8A; Exp.2: n = 75A + S) and untreated controls (Control; Exp.1: n = 8A; Exp. 2: n = 70A + S). In Exp.2, all goats were artificially inseminated. Transrectal ovarian ultrasonography and blood collection were done on days 7, 10, 13, 17, and 21 (Exp.1), and pregnancy detection on day 60 (Exp.2). Estrus and ovulations occurred in five hCG and seven Control animals. Accessory CL (aCL) were detected in all hCG does. The total luteal area of ovulatory corpora lutea (oCL) increased (P < 0.05) on day 10 in hCG does and remained greater (P < 0.05) than in Control until day 21. Total and high-velocity color Doppler area were greater (P < 0.05) for oCL of hCG does on days 13 and 17. Progesterone concentrations were greater (P < 0.05) in hCG does from days 13 to 21 and related directly to the total luteal and oCL area for the duration of the study in all does. The pregnancy rate was higher (P < 0.05) in hCG than in Control by 22.5 %. Human chorionic gonadotropin given on day 7 of the synchronized estrous cycle positively affected CL function and pregnancy rates in seasonally anovular dairy goats. |
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| Keywords: | Corpus luteum Pregnancy Progesterone Human chorionic gonadotropin Ovarian ultrasonography |
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