Body composition and nutrition requirements for weight gain of Santa InÃs and crossbreed BergamÃcia, Ile of France and Texel x Santa InÃs lambs / ComposiÃÃo corporal e exigÃncias nutricionais de cordeiras da raÃa Santa InÃs e cruzas F1

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The experiment was carried out in the Sheep Sector of the Animal Science Department of the Universidade Federal de Lavras - UFLA, in Lavras-M.G. The objective was to determine the body composition and to estimate the nutritional energy, protein and mineral macroelement (Ca, P, Mg, K and Na) requirements for weight gain of crossbreed lambs, Santa InÃs (SI), Bergamacia (BE), Ile of France (IF) and Texel (TE) crossed with Santa InÃs females, in different slaughter weights (15 kg, 25 kg, 35 kg and 45 kg of live weight). 48 female lambs were used, with initial average live weight (LWG) of 15 kg. These females were randomly distributed in four groups of 12 animals, three from each genetic group. The first group was slaughtered at the beginning of the experiment to evaluate energy, protein and minerals theor, and was defined as the reference for the comparative slaughter method. The remaining animals were kept in confinement, in which they received an âad libitumâ diet, and were slaughtered when they reached the predetermined live weights. The protein, fat, water and minerals composition was obtained through chemical analysis of body samples. Body composition was estimated through the prediction equations, obtained from regression of the logarithm of the amount of fat, protein, energy and minerals in the empty body on the logarithm of the empty body weight. In all the genetic groups, the protein theor decreased while fat and energy theor increased as the body weight increased. The F1-BE lambs presented greater protein demands, while the F1(TE and IF) lambs presented greater energy demands. The SI lambs presented greater Ca demands when compared to the F1(BE, TE and IF).

ASSUNTO(S)

energia bergamÃcia texel. zootecnia ilà of france texel ilà de france proteÃna bergamÃcia minerais minerals energy protein

ACESSO AO ARTIGO

Documentos Relacionados