Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 2
Written by Tatiana SHISHKINA, Tatiana GUSEVA, Alexey NAUMOV
The influence of the genotype for the Holstein breed on the longevity and life-long productivity of black-and-white cows was studied, and the intensity and reasons for the retirement of animals from the herd were analyzed. For this purpose, in the conditions of the breeding farm of the CJSC "Konstantinovo" of the Penza region, two groups were formed from the number of retired animals: group I with a blood content of the Holstein breed of less than 75% and group II with a blood content of more than 75%. As a result of the studies, it was found that the lifetime productivity of cows in group I was 24908 kg, which is 3816 kg higher than that of cows in the second group (P>0.95). The indicator of the period of economic use of cows was also higher in animals with a blood content of less than 75% for the Holstein breed - 4.58 units versus 3.66 in cows with a blood content of more than 75% (P> 0.99). According to the analysis of the reasons for cow retirement, depending on bloodiness, it was revealed that with blood content in the Holstein breed of less than 75%, the highest dropout rate is low productivity and udder diseases; if the blood in the Holstein breed is more than 75%, the largest dropout rate is leg diseases and other reasons.
[Read full article] [Citation]
