Abstract
The results of a study of hematological parameters of bulls from the Simmental (group I) and Limousin (group II) breeds and their crossbreeds of different generations are given: ½ Limousin ½ Simmental (group III generation I), ¾ Limousin ¼ Simmental (group IV generation II), ⅞ Limousin ⅛ Simmental (group V generation III) in summer and winter seasons. It was established that the total protein content in blood serum of calves from groups I and IV increased in summer period by 5.40 g/l (7.9%) and 2.01 g/l (2.9%) compared with winter season. n insignificant decrease in the studied indicator was noted in young animals of other groups. The concentration of albumin in blood serum of bulls from experimental groups was like a change in the content of total protein. The change in the total amount of globulins in blood of bulls with different genotypes was not the same. So, in summer compared to winter, their number in calves of the Simmental breed increased by 2.09 g/l (5.6%), and in Limousins and crossbreeds it decreased by 0.53 g/l (1.4%) and by 0.85-5.02 g/l (2.2-13.8%). It was established that the crossbreed bulls had more intensive process of increasing aminotransferase activity than purebred young animals.
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