Data/hora: 15/06/2024 04:37:00

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	26/07/1995	
Data da última atualização: 	26/07/1995	
Autoria: 	HOLLOWAY, J. W.; TOTUSEK, R.	
Título: 	Relatioship between preweaning nutritional management and subsequent performance of Angus and Hereford females through three calf crops.	
Ano de publicação: 	1973	
Fonte/Imprenta: 	Journal of Animal Science, v.37, n.3, p.807-812, 1973.	
Idioma: 	Inglês	
Conteúdo: 	A total of 206 Angus and Hereford females in four trials conducted under range conditions were studied under three nutritional management systems imposed by weaning at 140 days, weaning at 240 days, and creep-feeding followed by weaning at 240 days. At completion of treatments at 240 days of age, weights (kg) of the respective treatment groups were 182.1, 221.0 and 234.0 for Angus and 169.2, 202.0 and 217.9 for Herefords. The females, bred to calve first at 2 years of age, were allowed to produce calves through 4 yeras of age. Birth weight of first calves was heaviest (P <.05) from creep-fed females. Although differences were not statistically significant (P >.05), creep-fed females weaned the lightest calves in each of the three calf crops; their calves had the lowest condition scores (P <.10) and .005) in calf crops 1 and 3. Milk yield also tended to be lowest for creep-fed females, and highest for 240-days weaned females. None of eight additional estimates of size of the progeny at 140 days of age was consistently influenced by preweaning nutritional management of the dam. Calving and weaning percentages tended to be lowest for 140-day weaned females, particularly the fist calf crop and especially for the Herefords. Creep-fed females calved later (P <.01) their second calf. Althrough Angus females matured earlier and produced larger calves than the Hereford females, treatment x breed interactions (P <.05) were noted in only two of 30 comparisons involving estimates of size of progeny; Angus and Hereford females were apprently not affected differently by preweaning treatment. Considering both perform,ance and economic implications, the results of this experiment suggest that normal weaning (240 days) is preferable to early weaning (140 days) or creep-feeding for replacement heifers which will calve first at 2 years of age.	
Palavras-Chave: 	Bovine; Management.	
Thesagro: 	Bovino; Manejo; Nutrição.	
Thesaurus Nal: 	Angus; Hereford; nutrition.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (28716-1) - ADD - SP - -- - SP0406 -  - 0406 - DIS