Evaluation of different genotypes of pigs by the degree of use of the metabolizable energy and essential amino acids in feeds

Abstract

Breed differences in consumption and use for metabolizable energy growth and individual nutrients of feed (essential amino acids, particularly lysine) are determined. Large White breed gilts spent 46.17 MJ of metabolizable energy and 38 g of lysine perq kg of live weight gain at growing from 35 to 75 kg of live weight. Belarusian meat breed animals required for this, respectively, 44.92 MJ of metabolizable energy and 37.2 g of lysine. Costs of nutrients for gain of 1 kg of edible parts of the carcass (meat, fat) in pigs of large white breed were the highest - 64.18 MJ of metabolizable energy and 43.7 g of available (digestible) lysine. According to these indicators animals of Belarusian meat breed surpassed, respectively, by 61.53 MJ and 42.2 g of available lysine.