Data/hora: 16/04/2024 09:15:20

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	07/11/2017	
Data da última atualização: 	07/11/2017	
Autoria: 	CULLEN, R.; HOVELL, G. J. R.; SHEARER, G. C.	
Título: 	The control of oestrus and the effect on fertilisation following progesterone treatment in ewes.	
Ano de publicação: 	1968	
Fonte/Imprenta: 	The Veterinary Record, v. 83, n. 1, p. 10-13, Jul. 1968.	
Idioma: 	Inglês	
Conteúdo: 	Within the normal breeding season 30 Clun ewes were injected intramuscularly with 12.5 mg progesterone daily for 16 days and 30 similar ewes were maintained as controls. The suppression of estrus during the treatment period and the synchronization of estrus on withdrawal of treatment were excellent. Ten treated and 10 control ewes were ovaro-hysterectomized at approximately 53 or 125 hr. after their first recorded mating. The remaining 10 ewes from each group were maintained as lambing controls. The number of ovulations and development of corpora lutea were comparable in the groups operated on. Ova were recovered from the expected sites, but significantly fewer ova from the treated ewes were fertilized, particularly at approximately 125 hr. after mating. There were significantly fewer spermatozoa in the zona pellucida of ova recovered from the treated ewes and interference with sperm transport resulting from residual progesterone influence is postulated as the cause of the lowered fertility of ewes mated at the first post treatment synchronous estrus.	
Palavras-Chave: 	Oestrous cycle; Oestrus synchronization.	
Thesaurus Nal: 	Ewes; Progesterone; Sheep.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (35571-1) - ADD - AP - PP -  -  -  - DIS