Superovulation and oocyte recovery in the ewe |
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| Authors: | Alwan S F Boland M P Gordon I |
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| Affiliation: | 1. Department of Preventative Veterinary Medicine and Animal Reproduction, School of Agricultural and Veterinary Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane S/N, 14884-900, Jaboticabal, SP, Brazil;2. Institute of Agricultural Sciences, Federal University of Jequitinhonha and Mucuri Valleys, Av. João Narciso, 1380, 38610-000, Unaí, MG, Brazil;3. Department of Veterinary Clinical and Surgery, School of Agricultural and Veterinary Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane S/N, 14884-900, Jaboticabal, SP, Brazil;4. Brazilian Agricultural Research Corporation - Embrapa Dairy Cattle, Valença, Rio de Janeiro, 27640-000, Brazil;5. Department of Clinical of Large Animals, Federal University of Santa Maria, Av. Roraima nº 1000, Cidade Universitária, Santa Maria, 97105-900, Brazil;6. Brazilian Agricultural Research Corporation - Embrapa Goats and Sheep, Coronel Pacheco, Minas Gerais, 36155-000, Brazil;1. Laboratorio de Reproducción de Rumiantes Menores, INTA Bariloche, San Carlos de Bariloche, Argentina;2. Instituto de Ciencias Básicas y Medicina Experimental, Hospital Italiano de Buenos Aires, Argentina;3. Departamento de Reproducción Animal, SGIT-INIA, Madrid, Spain;1. Faculdade de Veterinária, Universidade Federal Fluminense, Niterói, RJ, Brazil;2. Faculdade de Medicina Veterinária, Universidade do Grande Rio, Duque de Caxias, RJ, Brazil;3. Embrapa Caprinos e Ovinos, Núcleo Regional Sudeste, Coronel Pacheco, MG, Brazil;4. Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay;1. Department of Animal production, College of Food and Agriculture Sciences, King Saud University, P. O. Box 2460, Riyadh 11451, Saudi Arabia;2. Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, Sharkia 44519, Egypt;3. Department of Physiology, Faculty of Veterinary Medicine, Zagazig University, 44519 Zagazig, Egypt;4. Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Sharkia 44519, Egypt;1. Laboratory of Manipulation of Oocytes and Preantral Follicles, Faculty of Veterinary, State University of Ceará, Fortaleza, CE, Brazil;2. Laboratory of Animal Physiology, Department of Animal Science, Federal University of Ceará, Fortaleza, CE, Brazil;3. Institute of Biomedical Sciences, Federal University of Uberlândia, Uberlândia, MG, Brazil;4. Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, University of Murcia, Murcia, Spain;5. Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL, United States;1. Embrapa Goats and Sheep Research Center, Estrada Sobral/Groaíras, km 04, CP 145, CEP 62010-970, Sobral, CE, Brazil;2. Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP 24230-340, Niterói, RJ, Brazil;3. Department of Preventative Veterinary Medicine and Animal Reproduction, School of Agricultural and Veterinary Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane s/n, CEP 14884-900, Jaboticabal, SP, Brazil;4. Department of Animal Science, Viçosa Federal University, Av. P.H. Rolfs, s/n, CEP 36571-000, Viçosa, MG, Brazil;5. Capril Sanri, Av. Constelações 385/242, Vale dos Cristais, CEP 34000-000, Nova Lima, MG, Brazil |
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| Abstract: | ![]()
Thirty-eight adult ewes were superovulated following a 12 d progestagen treatment in association with either 135 mg crude horse anterior pituitary extract (HAP) or 30 mg soluble HAP with or without 1000 IU human chorionic gonadotrophin (hCG). Soluble HAP in combination with hCG significantly (P < 0.01) increased the ovulation rate as compared to HAP alone (14.5 vs 5.3, respectively). The number of oocytes recovered per ewe showing estrus following soluble HAP and HCG (6.9) was higher than after HAP alone (3.3), but this difference was not significant. A significantly higher (P < 0.05) ovulation rate and ovarian response were obtained following crude HAP than soluble HAP (14.0 vs 6.3 and 15.3 vs 9.4, respectively). There was a tendency for the proportion of follicles which ovulated to be higher in the crude HAP group. The mean number of oocytes or the proportion of oocytes recovered was significantly higher (P < 0.05) in the crude HAP group than in the soluble HAP group. |
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