Data/hora: 08/06/2024 02:40:49

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	07/10/1996	
Data da última atualização: 	03/04/2017	
Autoria: 	PRUITT, R. J.; CORAH, L. R.	
Título: 	Effect energy intake after weaning on the sexual development of beef bulls. I.Semen characteristics and serving capacity.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	Journal of Animal Science, v.61, n.5, p.1186-1193, 1985.	
Idioma: 	Inglês	
Conteúdo: 	Simmental and Hereford bulls were individually fed varying levels of the same diet to determine the effects of energy intake after weaning, degree of fatness, and short-term weight change on reproductive characteristics of yearling beef bulls. For 200 d (ending in may), 29 Simmentals were fed an average of 14.6, 19.2 or 23.8 Mcal and 27 Herefords were fed 13.4, 17.5 or 22.2 Mcal metabolized energy per bull daily. Bulls then were adjusted to a roughage diet for 10 d before grazing brome pasture for 38 d (ending in june). Energy level did not affect motility or sperm morphology of semen collected with an artificial vagina in May and June. High energy levels were not detrimental to bull performance during a 30-min serving-capacity test in May or June. Backfat thickness was not related to semen characteristics or serving capacity. Amount of weight lost from May to June did not affect the semen qaulity or serving capacity of Herefords. Those Simmental bulls that had a more prositive weight change from May to June had a more favorable change in semen quality from May to June (P<.05) due to lower semen quality in may (P<.05). The high level of energy was not detrimental to semen characteristics or serving capacity. Some of the Simmental bulls may have been underfed for maximum semen qaulity at the beginning of the pasture period. Within the normal range of energy fed to beef bulls from weaning to the beginning of the breeding season as yearlings, it may be more likely to underfeed breeds of large mature size than to overfeed British breeds.	
Palavras-Chave: 	Beef bull; Touro de corte.	
Thesagro: 	Nutrição; Reprodução; Sêmen.	
Thesaurus Nal: 	nutrition; reproductive performance.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (33135-1) - ADD - SP - PP - SP15010 -  - 15010 - DIS