BIOCHEMICAL INDEXES OF BLOOD SERUM AND THEIR RELATIONSHIP WITH SOME SIGNS OF GROWTH OF BULL-CALFS OF GRAY UKRAINIAN AND UKRAINIAN MEAT BREEDS IN THE POSTNATAL DEVELOPMENT PERIOD

Abstract

Goal. The paper presents the results of the study of indicators of individual development of gray Ukrainian and Ukrainian beef cattle, biochemical indicators of blood serum, and also calculated the level of correlations between traits. Methods. The research was conducted at the State Enterprise "Experimental Farm "Polyvanivka", the Animal Husbandry Laboratory of the State Establishment "Institute of Grain Crops NAAS" and the testing center of the Institute of Animal Science NAAS (Kharkov) using generally accepted zootechnical, statistical, biochemical and laboratory research methods. Results. Research has established that the biochemical parameters of blood serum in Ukrainian gray and Ukrainian beef cattle correspond to the physiological norm of clinically healthy animals. It was determined that the minimum requirements of the elite class prevailed by +1.45 - + 0.6 1 % according to the live weight indexes of Ukrainian gray and Ukrainian beef cattle at the age of 12 months; at the age of 6 months, this index ranges from -2.09 (Ukrainian gray bull-calfs) to +2.61 % (Ukrainian meat bull-calfs). The average daily gain in live weight of animals of the studied breeds during the growing period from birth to 6 months of age and from birth to 12 months of age varies from 830.1 to 1052.4 g. Coefficients of phenotypic consolidation of bull-calfs of gray Ukrainian and Ukrainian beef cattle vary from +0.241 (K1, live weight of bull-calfs Ukrainian beef cattle at birth) to +0.794 (K2, live weight of bull-calfs gray Ukrainian beef cattle at 6 months of age). The pairwise correlation coefficient between serum biochemical parameters and live weight of bull-calfs of gray Ukrainian and Ukrainian beef cattle varies from -0.600+0.2830 to + 0.635+0.25765. This indicates the possibility of using total protein content, activity of aspartate aminotransferase (AsAT), alanine aminotransferase (AlAT) and alkaline phosphatase for early prediction of live weight of animals of the studied breeds. Conclusions. Young cattle of Ukrainian meat and gray Ukrainian breeds are characterized by sufficiently high growth rates and their phenotypic consolidation. The presence of reliable correlation coefficients between indexes of individual development and interior indicates the possibility of their use for early prediction of live weight and average daily growth. Key words: cattle, bull-calfs, breed, biochemical parameters of blood serum, live weight, average daily live weight gain, variability, correlation