Data/hora: 22/06/2024 19:06:19

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	21/08/1995	
Data da última atualização: 	16/07/2012	
Autoria: 	WARNICK, A. C.; KIRST, R. C.; BURNS, W. C.; KOGER, M.	
Título: 	Factors influencing pregnancy in beef cows.	
Ano de publicação: 	1967	
Fonte/Imprenta: 	Journal of Animal Science, v.26, p.231, 1967.	
Idioma: 	Inglês	
Conteúdo: 	The effects of nine factors on pregnancies rate of cows at the Brooksville Beef Cattle Re-search Station were studied. A total of 1,025 potencial pregnancies were studied in Angus, Brahaman, Brangus, Hereford and Santa Gertrudis under similar management. A separate least squares analysis was made for each breed. The age of calf at weaning had a higly significant effect on pregnancies rate in all breeds, indicating that cows calved early had a greather chance of becoming pregnant. The age of cow had a significant effect in the Brahman, Hereford and Santa Gertrudis breeds. The condition score of calf affected pregnancies significantly only in Brahman cows, but there was a negative relationship between condition of calf and pregnancies status of cows in all breeds. Weight change of cows during the breeding season influenced preganancy in the Brahman and Santa Gertrudis, with cows losing the most weight having a lower pregnancies rate. Year, sex of calf 205-day weight of calf and pre-calving weight of cow did not significantly influence pregnancy rate. The calving rates for Angus, Brahman, Brangus, Hereford and Santa Gertrudis were 83, 69, 81, 81 and 68%, respectively. Selection for weaning weight should not be antagonistic to fertility.	
Palavras-Chave: 	Beef cow; Taxa de gravidez.	
Thesagro: 	Gado de Corte; Reprodução.	
Thesaurus Nal: 	pregnancy rate; reproduction.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (29312-1) - ADD - SP - -- - SP0944 -  - 0944 - DIS