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Provedor de dados:  R. Bras. Zootec.
País:  Brazil
Título:  Body composition and net and dietary macrominerals requirements of Nellore steers under grazing
Autores:  Almeida,Vitor Visintin Silva de
Queiroz,Augusto César de
Silva,Robério Rodrigues
Silva,Fabiano Ferreira da
Oliveira,Aline Cardoso
Santana Júnior,Hermógenes Almeida de
Data:  2009-06-01
Ano:  2009
Palavras-chave:  Macrominerals
Zebu cattle
Resumo:  This experiment was carried out with the objective of determining the macrominerals (Ca, P, Mg, K and Na) requirements of Nellore steers under grazing. Twenty four Nellore steers (371 ± 14 kg of BW and 26 mo old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference in subsequent study. The remaining 20 animals were weighed and distributed into a completely randomized design with four supplementation levels offer: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% of BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different supplementation levels offer. The contents of macrominerals retained in the animal body were determined by regression equations of the macrominerals body content logarithm in function of the empty body weight logarithm (EBW). Net macrominerals requirements for a gain of 1kg of EBW were obtained using the equation Y'= b.10ª.Xb-1, with a and b, respectively, the intercept and the regression coefficient of the prediction equations of macrominerals in the animal body contents for each macromineral considered. The concentrations of all macrominerals, in the empty body weight and gain of the empty body weight, decreased with the increase in the body weight. Total calcium and phosphorus dietary requirements are higher than those recommended in the literature.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Zootecnia
Relação:  10.1590/S1516-35982009000600016
Formato:  text/html
Fonte:  Revista Brasileira de Zootecnia v.38 n.6 2009
Direitos:  info:eu-repo/semantics/openAccess

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