net requirements of energy, protein and macrominerals for weight gain of grazing beef cattle castrated at different ages, with and without supplementation
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2012
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Abstract
The objective of this experiment was to estimate the requirements of energy, protein and macrominerals of grazing crossbreds calves, in Brachiaria decumbens Stapf pasture, castrated at different ages, with and without supplementation. Forty-seven young calves at initial age of 120±30.1 days and 115.3±1.97 kg of live weight were used. To estimate net energy requirements for weight gain, a regression equation between energy retained in the gain and empty body weight gain and metabolic empty body weight was obtained. For estimation of net protein requirements for weight gain, a regression equation was adjusted between protein retained in gain and empty body weight gain and energy content of this gain. Net requirements of Ca, P, Mg and Na for weight gain were determined by the equation Y' = a.b. Xb-1, in which a and b represent the intercept and the coefficient of the alometric equation of macromineral body content prediction, respectively. Neither castration nor concentrate supplementation affects body weight gain net requirements, except the ones of Ca, which were higher for non-castrated animals.
| Reference Key |
rocha2012revistanet
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| Authors | ;Anilza Andréia da Rocha;Mário Fonseca Paulino;Henrique Jorge Fernandes;Lívia Vieira de Barros;Sidnei Antonio Lopes;Leandro Galon;Aline Gomes da Silva;Daniel Mageste de Almeida |
| Journal | european journal of lipid science and technology |
| Year | 2012 |
| DOI |
10.1590/S1516-35982012000200025
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| URL | |
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