MILK YIELD AND NATURAL RESISTANCE OF FIRSTBORN UKRAINIAN BLACK AND WHITE DAIRY CATTLE
M. Kuziv
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Institute of Animal Biology NAAS,
38 V. Stus str, Lviv 79034, Ukraine
Milk yield takes the leading role in animal breeding of dairy cattle. Since increased productivity may be accompanied by a weakening of the body composition and natural body resistance against diseases further improvement of breeds is not possible without deep knowledge of their biological features that characterize the resistance of animals.
The research was conducted on cow-firstborn Ukrainian black and white dairy cattle in LLC “Milk River” Sokal department of Lviv region.
Animals of Ukrainian black and white dairy cattle in western Ukraine have high genetic potential, as evidenced by the performance of firstborn. Thus, the average value of milk yield of cows firstborn was 6032 kg of milk fat 3,73 %, and the yield of milk fat was 225,0 kg. Animals of Ukrainian black and white dairy cattle revealed some differences in humoral and cellular immunity links during lactation. After 2 months of lactation period, compared with 5 and 8 months, phagocytic activity of neutrophils was reduced to 2,91 % (P<0,01) and 2,05 % (P<0,05), phagocytic number — 0,38 (P<0,001) and 0,27 in. units. (P<0,01), serum bactericidal activity — to 3,17 % (P<0,001) and 2,42 % (P<0,01), the number of T-lymphocytes — to 2,13 % (P<0,001) and 1,02 % (P<0,05). Lysozyme activity of blood serum, phagocytic index and the number of B-lymphocytes varied similarly; however, these changes were unlikely. Overall natural resistance morphological and biochemical parameters of blood, humoral and cellular immunity in parts firstborn according to lactation ranged 61–64 points which is considered a normal level. The correlation between the value of milk yield, milk fat yield and overall assessment of natural resistance during lactation was positive, and the correlation between the fat content in milk and overall assessment of natural resistance ranged from negative to positive values.
Keywords: BREED, COWS,MILK PRODUCTION, NATURAL RESISTANCE, THE CORRELATION COEFFICIENT
