Digestibilidade aparente da dieta de touros da raça nelore selecionados pelo consumo alimentar residual

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Mobiglia, Andrea de Mello lattes
Orientador(a): Fernandes , Juliano José de Resende lattes
Banca de defesa: Fernandes , Juliano José de Resende, Siqueira, Gustavo Rezende, Mello, Heloísa Helena de Carvalho
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Goiás
Programa de Pós-Graduação: Programa de Pós-graduação em Ciência Animal (EVZ)
Departamento: Escola de Veterinária e Zootecnia - EVZ (RG)
País: Brasil
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/3494
Resumo: Owing to the potential of utilization of residual feed intake as tool for genetic selection becomes indispensable the studies that looking for understand the variables influence RFI, principally data from cattle of Nellore breed, consist with Brazilian reality. The aim of this study was to evaluate the apparent digestibility of diet of Nellore bulls classified by residual feed intake (RFI). One hundred and twenty Nellore bulls were used , with body weight (BW) of 392.5 ± 47.15 kg. The animals were maintained in a feedlot with individual pens and fed with the same diet for 83 days. The animals were fed ad libitum and the diet was composed of sorghum silage, sugarcane bagasse and concentrate, in relation 33:67 (V: C) in dry matter. The animals were weight at the beginning of the trial and every 28 days after the solid feed restriction. The refused and offered fed were weight to measure the daily feed intake. RFI was calculate by difference between the observed intake and estimated intake what was obtained through a multiple regression equation of feed intake, average daily gain (ADG) and metabolic body weight (MBW) of the animals. On eighth week was realized a digestibility assay. To estimate the fecal production was used indigestible neutral detergent fiber (NDFi) as internal marker. The randomized design was used for statistical analysis. The ADG and BC were the same for different RFI groups (P>0.05), despite of low RFI animals showed lower feed intake (P<0.05) than medium and high RFI. However, the digestibility coefficient did not differ between the RFI groups (P>0.05). In contrast, the apparent digestibility of NFC was negative correlated (– 0,23) with the RFI.