METHODS OF EVALUATION OF MILK PRODUCTION EFFICIENCY BY COWS FROM DIFFERENT GENETIC GROUPS IN CONDITIONS OF THE HIGH-TECHNOLOGICAL FARM (part one)
Journal Title: Науковий вісник Національного університету біоресурсів і природокористування України. Серія : Технологія виробництва і переробки продукції тваринництва - Year 2017, Vol 1, Issue 271
Abstract
A comprehensive assessment of the efficiency of milk production by animals of different genetic groups was carried out. The researches were conduct in the conditions of a modern milk complex for 1500 cows with an unattached system of keeping in boxes and feeding with the use of mixed rations. The superiority of Brown Swiss breed cows in comparison with domestic Ukrainian black-and-white and red- and-white dairy breeds has been proved. Several modern methods have been applied to compare the breeding efficiency of these breeds. On the basis of the ratio of "input" feed nitrogen and "output" milk protein, the Cross Efficiency of crude protein (CECP) was estimated, which made it possible to determine the peculiarities of animals of different genetic groups. In addition, an estimate of feed conversion and urea levels in milk was made. The measures of genotypic and environmental influence on productive traits are also determined. It was established that the feeding diet significantly influences on: daily milk yield (the measure of the effect η2 = 0.639, the confidence level P ≥ 0.999), the fat content (η2 = 0.368, P ≥ 0.999), the protein content (η2 = 0.093, P ≥ 0.999), the somatic cells in milk (η2 = 0.10, P ≥ 0.999). The urea content in milk is positively correlated with the protein content in milk: correlation coefficient r = 0.130 (P ≥ 0.95). The season of the year has a significant effect on milk yield (η2 = 0.087, P ≥ 0.999), fat content (η2 = 0.161, P ≥ 0.999), protein content in milk (η2 = 0.044, P ≥ 0.999), somatic cell content (η2 = 0.09, P > 0.999). Brown Swiss cows have a higher daily standardized milk yield (+0.976 kg) and protein utilization efficiency (+1.7 %) compared to Ukrainian black-and-white and red- and-white dairy breeds.
Authors and Affiliations
S. Ruban, A. V. Perkrestova, V. P. Shablia
Keywords
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