Data/hora: 16/06/2024 10:44:28

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Feed efficiency of Nellore cattle selected for postweaning weight	
Autores: 	Castilhos,André Michel de; Branco,Renata Helena; Corvino,Tatiana Lucila Sobrinho; Razook,Alexander George; Bonilha,Sarah Figueiredo Martins; Figueiredo,Leopoldo Andrade de.	
Data: 	2010-11-01	
Ano: 	2010	
Palavras-chave: 	Beef cattle; Feed conversion; Residual feed intake; Selection.	
Resumo: 	Two Nellore herds were compared, one selected for greater postweaning weight and the other, control, selected for average postweaning weight, to evaluate the effects of 29 years of selection on feed efficiency. Sixty Nellore males (41 selected and 19 control) averaging 205 kg and 267 days of age were evaluated in individual pens during performance test. Performance and dry matter intake were used to determine the following feed efficiency traits: feed conversion; residual feed intake; residual gain; partial growth efficiency; relative growth rate and Kleiber ratio. After the 112-day experimental period, control animals showed lower body weight when compared to selected animals, however, they did not differ for dry matter intake (% of body weight), rib-eye area and fat thickness at the 12th rib subcutaneous region and on the rump region. Dry matter intake (kg/day) and average daily weight gain from selected animals were, respectively, 19.4% and 26.4% higher than the control ones. The highest average daily weight gain by selected animals promoted significant improvement, around 6%, on feed conversion; 70 g/day on residual gain; and 17% on Kleiber rate. The other feed efficiency traits (residual feed intake, partial growth efficiency and relative growth rate) did not differ between herds. The 29-year selection for post-weaning weight did not affect feed efficiency of Nellore cattle.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100023	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982010001100023	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.39 n.11 2010	
Fonte: 	info:eu-repo/semantics/openAccess