Аграрный вестник Урала № 09 (115) 2013Животноводство
STUDIES OF THE HOUSING TECHNOLOGY EFFECT ON THE MEAT PRODUCTIVITY OF KAZAKH WHITE-HEADED BULLS
The article presents the results on the housing technology effect on meat productivity of Kazakh white-headed bulls of Russian selection. To reach our goal the following tasks were completed: determined features of growth and development of the experimental calves at free and tied housing, identified peculiarities of meat productivity, meat qualities after slaughter of Kazakh white-headed bulls, explored the chemical composition of an average sample of carcass pulp, investigated chemical composition, biological value and histology of longissimus muscle. Two groups of Kazakh white-headed calves of Russian selection were formed for the experiment on the basis of pairs-analogs of 30 animals at the age of 10 months each. Studies have shown that calves of group II at the end of the experiment, at the age of 16 months, were superior to their counterparts in terms of live weight by 36.5 kg (7.19 %). During the period of breeding and fattening of 10 months, up to 16 months, calves of both experimental groups had a high energy growth, but the highest was in group II which were kept tied indoors. The average daily gain was 1076.67 g in group I and 1278.00 in group II. Control slaughter showed higher meat quality indicators in group II. Tied housing of group II calves resulted in a higher deposition of visceral fat, the output of which was higher in comparison with their counterparts in group I by 0.4 %. When studying the chemical composition of the obtained raw meat, it has been found that the protein contained in the meat of both groups has approximately equal amounts. The ratio of protein to fat in the meat of calves of group II was 1 : 0.88 and in group I — 1 : 0.82. In terms of tryptophan content in meat, the bulls of Group II had it at 53.14 mg, or 13.02 %, oxyproline was higher in the meat of calves in group I by 0.9 mg, or 1.56 %. On the basis of our research results, we can conclude that the tied housing had a positive impact on the increase in meat productivity, meat output and meat quality of experimental animals.
content, Kazakh white-headed breed, live weight, meat productivity, meat yield, chemical composition, biological value, histology
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