Milk productivity and blood biochemical indices in crossbred black pied x holstein friesian and black pied cows
Ertuev, M.M.; Netesa, Y.I.; Ivanov, I.S.
Izvestiya Timiryazevskoi Sel'skokhozyaistvennoi Akademii 5: 143-151
Milk yield increases considerably due to crossing Black-and-White cows with Holstein-Friesian bulbs. Milk productivity level in cross-bred cows in 578 kg higher than in Black-and-White cows, and fat content in mik is 0.02% lower. Total protein content, cholesterine, lipids and ketone bodies content increases in blood of animals of both groups in the period of active milk secretion. Cholesterine and ketone bodies content in blood during lactation is higher in cross-bred cows, however, the difference between groups as to the first index has been proved at 3rd and 6th months of lactation, and as to the second index, at 3rd and 8th months.