EVALUATION OF PHYSICO-CHEMICAL PARAMETERS OF COW'S MILK DEPENDING ON THE LINEAR AFFILIATION

Abstract

Currently, the level of Holstein exposure in some Russian regions has reached more than 75% for Holsteins. In the Sverdlovsk region, the blood content of the Holstein breed is on average 87.5%. Breeding is conducted along Holstein lines. It is of interest to evaluate the physico-chemical and technological properties of the milk of cows of modern dairy cattle of a new formation, depending on the linear origin. It has been established that cows of different lines differ significantly in milk yield. The difference ranged from 481 kg (Vis Back Ideal 1013415) to 3427 kg (Montvik Chieftain 95679) or by 4.3 – 30.6% in favor of cows of the Reflection Sovering 198998 line at P≤0.05 - P≤0.001. A significant difference in MJ in milk was revealed in favor of cows of the Montvik Chieftain 95679 line, relative to other animals (P≤0.01). The milk of cows of the Reflection Sovering 198998 line turned out to be the best in terms of physico-chemical composition. Thus, a higher content of dry matter was noted in the milk of cows of this line. It was 12.70±0.205, which is 0.03 and 0.16% higher than in the milk of cows of the Vis Back Idial 1013415 line and the Montwick Chieftain 95679 line, respectively (P0,05, P0,01). A higher nutritional value has been established in the milk of cows obtained from animals of the Montvik Chieftain line 95679 - 64,17/268,82 kCal/kJ, which is more than the milk of cows of other lines by 0.43 and 0.36 kCal or by 2.37 – 1.90 kJ. In the milk of cows of the Montvik Chieftain 95679 line, the duration of rennet coagulation of milk (the duration of clot formation) was shorter by 7-8 minutes (according to Dilanian) and by 7'43" - 10'11" ( by N.V. To Barabanshchikov). Theclotwasmoredense.