Body composition and net and dietary macrominerals requirements of Nellore steers under grazing

Revista Brasileira de Zootecnia

Santana Júnior, Hermógenes Almeida de³  Silva, Robério Rodrigues²  Oliveira, Aline Cardoso¹  Almeida, Vitor Visintin Silva de¹  Silva, Fabiano Ferreira da²  Queiroz, Augusto César de⁴ 

[1] UFV;UESB, Itapetinga;Universidade Estadual do Sudoeste da Bahia;UFV, Viçosa

关键词: macrominerals;    pasture;    requirements;    zebu cattleRESUMOCom o objetivo de determinar as exigências de macrominerais (Ca;    P;    Mg;    K e Na) de bovinos Nelore castrados sob pastejo;    foi conduzido um experimento com 24 novilhos da raça Nelore;    castrados;    com peso inicial de 371 ± 14 kg e 26 meses de idade;   

DOI  :  10.1590/S1516-35982009000600016

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

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.

【 授权许可】

CC BY-NC