THE INFLUENCE OF HOLSTEIN BREED ON THE CHEMICAL COMPOSITION AND TECHNOLOGICAL PROPERTIES OF THE MILK OF BLACK-AND-WHITE CATTLE

Holsteins stud bulls of Western and European breeding with different linear affiliation, are widely used for improvement of dairy cattle in Russia.In this regard, it is important to know what influence they will have on the productivity, quality and technological properties of milk. The purpose was to study the influence of genetic factors on the quality indicators and technological properties of milk. Studies were conducted on the local livestock of black-and-white cattle with different linear affiliations.Control group - the line of Eagle; 1st experimental group - Reflection Sovereign line; 2nd experimental group - Montvic Chieftainline; 3rd experimental group - Vis Bake Ideal line. The highest yields of milk for 305 days of lactation was obtained from cows line V.B. Ideal - 4889 kg, which was significantly higher than yields in control group at 917 kg (P <0.001). No significant difference in the fat content of milk has been established. The protein content in the milk of all experimental groups was quite high and was on average - 3.12%.As well, the greatest content of it (3.2%) noted in the group of cows belonging to R. Sovereign line. In the first and second experimental groups, quantity of milk fat and protein was on average 163 kg and 135 kg respectively, which is also higher than in the control group. The average dry matter content in the milk of cows all experimental groups was 12.4 %. While the greatest amount of dry substance was noted in the control group. The analysis of the thermal stability of cow’s milk of different lines showed that milk from cows belonging to R. Sovereign and V.B. Ideal lines have the first group of heat stability. Studies lead to the conclusion that the best indicators of the chemical composition and technological properties of the milk of black-and-white cattle under the Oryol Region termswere obtained using the Holstein stud bulls belonging to the R. Sovereign and V.B. Ideal lines.