The efficiency of using protein additive in feeding of cows in the early lactation period

The objective of the study was to determine the effectiveness of using feeding protein feed additive (flour) from the dermis of cattle to cows Ayrshire breed in the early lactation period. The research problems were the determination of chemical composition of the additive, milk productivity of the cows, chemical composition of milk and the assessment of economic efficiency of using the flour. The experiment was carried out on the basis of JSC ‘Pakhma’ in Yaroslavl Region on 3 groups (control and 2 experimental), the cows of Ayrshire breed (n = 6) created by method of couples analogs. The cows of the I group received the main diet, the animals from II and III groups in addition were fed with on 300 and 500 g proteinaceous flour respectively per head a day during 60 days. Its feeding positively influenced the indicators of dairy efficiency of cows: average daily yield of milk, the amount of milk fat and protein. During the experiment from the cows of the II group it was received on 588 and on 339 kg of milk more, than from animals from control and the III groups respectively. On the 90th days the quantity of fat globules in milk of cows of the I group made 4.51±0.77 billion/ml, animal II and III groups had 6.66±1.06 billion/ml and 7.23±1.03 billion/mlrespectively. The somatic cell count was lower in the milk of the cows of II and III groups than in the control group. The cows of the II group had a tendency to higher indicators of dairy efficiency than the control and III groups. The use of proteinaceous feed additive is economically expedient.