Data/hora: 23/09/2024 02:51:35

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	08/06/2016	
Data da última atualização: 	20/02/2017	
Autoria: 	TEIXEIRA, T. A.; FONSECA, J. F. da; SOUZA-FABJAN, J. M. G. de; CARVALHEIRA, L. de R.; FERNANDES, D. A. de M.; BRANDÃO, F. Z.	
Afiliação: 	Tarcísio Alves Texeira, Faculty of Veterinary Medicine, Fluminense Federal University (UFF) - Niterói, RJ, Brazil; JEFERSON FERREIRA DA FONSECA, CNPC; Joanna Maria Gonçalves de Souza-Fabjan, UFF - Niterói, RJ, Brazil; Luciano de Rezende Carvalheira, UFF - Niterói, RJ, Brazil; Daniel Andrews de Moura Fernandes, UFF - Niterói, RJ, Brazil; Felipe Zandonadi Brandão, UFF - Niterói, RJ, Brazil.	
Título: 	Efficiency of different hormonal treatments for estrus synchronization in tropical Santa Inês sheep.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Tropical Animal Health and Production, Heidelberg, v. 48, n. 3, p. 545-551, Mar. 2016.	
DOI: 	10.1007/s11250-015-0989-y	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The aim of this study was to evaluate the effect of (i) the duration of hormone treatment with progestogen sponges during the seasonal anestrus and (ii) the administration of two doses of prostaglandin at 7 days apart during the breeding season on reproductive parameters of Santa Inês ewes. In experiment 1, 32 ewes received intravaginal MAP sponges for 6 (G6 days), 9 (G9 days), or 12 (G12days) days and 75 ?g D-cloprostenol i.m. and 300 IU eCG i.m. 1 day before sponge removal. In experiment 2, 23 ewes received two doses of 0.48-mg sodium cloprostenol i.m. 7 days apart. Ovarian follicular dynamic was assessed through transrectal ultrasonography. Blood samples were collected daily to determine progesterone concentrations. In experiment 1, estrus and ovulation rates did not differ (P?>?0.05) among protocols and between cyclic and acyclic ewes at the beginning of the experiment. The G9 days treatment showed a lower dispersion of ovulations in relation to onset of estrus when compared to G6 days and G12 days. In experiment 2, all ewes exhibit estrus and ovulated after the second dose of prostaglandin, although ewes that were in diestrus at D0 showed subluteal concentrations of progesterone during the follicle development stage of the treatment. In conclusion, the use of progestogen device during 9 days promotes lower dispersion of ovulation when compared to its use for 6 or 12 days, and the protocol of two doses of prostaglandin 7 days apart synchronizes estrus efficiently but results in follicular development under low progesterone concentrations.	
Palavras-Chave: 	Cyclicity; Native breed; Progesteron; Prostaglandin; Raça Santa Inês.	
Thesagro: 	Hormônio animal; Ovelha; Ovino; Progesterona; Prostaglandina; Reprodução.	
Thesaurus Nal: 	Ewes; Periodicity; Reproduction; Sheep.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (31102-1) - UPC - AP - DD -  -  -  - DIS