Data/hora: 07/06/2024 13:37:27

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	14/12/1998	
Data da última atualização: 	18/12/1998	
Autoria: 	MOORE, C. P.; ROCHA, C. M. C. da.	
Título: 	Reproductive performance of Gyr cows: the effect of weaning age of calves and postpartum energy intake.	
Ano de publicação: 	1983	
Fonte/Imprenta: 	Journal of Animal Science, Champaign, v.57, n.4, p.807-814, 1983.	
Idioma: 	Inglês	
Conteúdo: 	Two nutritional levels following parturition and five weaning ages for the calf were evaluated to study their effect of reproduction in Gyr cows in the savannas of West Central Brazil (Campos Cerrados). Early weaning of calves reduced postpartum weight losses and shortened the postpartum interval to conception. Energy level did not affect cow weight at weaning or conception, the number of days from parturition to firs estrus or the number of matings/ conception; however, the postpartum period to conception was reduced (116 vs 160 d P<05) for cows on the higher energy diet. Weaning age significantly affected postpartum weight loss in cows. Six months after calving, cows that nursed calves for 1 mo were 89 kg heavier than those that nursed calves for 6 mo (384 vs 295 kg; P<05). Cows that were nursed for 1 moreturned to estrus at an average of 40 d postpartum, which 23 d earlier (P<05) than the average of the other groups nursed for longer periods of time. There was no significant difference in the postpartum period to conception among cows that had their calves weaned at 1 mo, 3 mo and cows which were nursed twice daily beginning 30 d after parturition (57, 94 and 97 d, respectively) but was less (P<.05) for cows nursed for 5 or 6 mo (212 and 231 d, for cows nursed for 5 or 6 mo (212 and 231 d, respctively). The results show that Gyr cattle are genetically capable of respondig reproductively to improve nutrition and reduced lactation stress achieved through early weanig or controlled nursing. (key words: Bovine, Gyr, Reproduction, Early Weaning, Energy, Controlled Nursing).	
Palavras-Chave: 	Claves; Gado Gyr.	
Thesagro: 	Cerrado; Desmama; Novilho; Parto; Reprodução Animal; Vaca.	
Thesaurus Nal: 	animal reproduction; calves; cows; parturition; weaning.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (1342-1) - UPC - SP - -- - CRI4855 -  - CRI4855 - DIS
CPAC - (1344-1) - UPC - SP - -- - CRI4855 -  - CRI4855 - DIS