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Provedor de dados:  R. Bras. Zootec.
País:  Brazil
Título:  Bionutritional efficiency of crossbred beef cattle finished on feedlot andslaughtered at different body weights
Autores:  Mello,Renius
Queiroz,Augusto César de
Faria,Marcelo Henrique de
Henrique,Douglas Sampaio
Data:  2010-03-01
Ano:  2010
Palavras-chave:  Animal performance
Feed efficiency
Feed conversion
Kleiber ratio
Multivariate biological nutritional index
Residual feed intake
Resumo:  The objective of this study was to assess the bionutritional efficiency of crossbred F1 Red Angus × Nellore (½ RA ½ N) and F1 Blonde D'Aquitaine × Nellore (½ BA ½ N) young bulls finished on feedlot and slaughtered at 480, 520 and 560 kg body weight. A completely randomized experimental design in a 2 × 3 (genetic group × slaughter weight) factorial arrangement with six replicates was used. The ½ BA ½ N young bulls showed higher kidney, pelvic and inguinal fat (KPIF, kg and % BW) and lower multivariate biological nutritional index (MBNI) and residual feed intake than ½ RA ½ N young bulls. The young bulls slaughtered at heavier weight had larger ribeye area (cm²), fat thickness over the 12-13th rib, fat thickness over the rump, KPIF (kg and % BW), dry matter intake (DMI, kg/d), net energy intake (MJ/d) and metabolizable protein intake (g/d), and MBNI compared to young bulls slaughtered at lighter weight. Furthermore, the ½ BA ½ N young bulls slaughtered at 480 kg had lower feed conversion than the others. On the other hand, the average daily weight gain (kg/d), DMI (% BW and g/BW0.75), feed efficiency and Kleiber ratio did not differ between genetic group, slaughter weight and genetic group versus slaughter weight interaction. Therefore, crossbred F1 Blonde D'Aquitaine × Nellore young bulls and animals slaughtered at lighter weights are more bionutritionally efficient in the finishing phase on feedlot.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Zootecnia
Relação:  10.1590/S1516-35982010000300018
Formato:  text/html
Fonte:  Revista Brasileira de Zootecnia v.39 n.3 2010
Direitos:  info:eu-repo/semantics/openAccess

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