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THE IMPACT OF SOME FACTORS ON MILK PRODUCTION OF BLACK SPOTTED COWS IN THE PIEDMONT ZONE OF NORTH CAUCASUS

Gogaev O.K., Tukfatulin G.S., Godzhiev R.S., Kadieva T.A., Kokoeva A.T., Kokoeva Al.T., Margieva F.T., Vanieva B.B.

Only 60% of the genetic capacity of milk cattle is presently used in Russia, therefore the purpose of this research is to study some factors affecting the quantitative and qualitative indicators of Black Spotted cow milk in the piedmont zone of North Cau-casus. The study was carried out from 2013 to 2016. The materials of 112 Holstein breed cows with different blood were ana-lyzed in the course of studying the genotype impact on the milk productivity. To see the impact of service we studied 120 cows with different lactations, dry periods and carving interval on the milk productivity. The values for 108 cows with different lacta-tions were examined to see the connection between the productive longevity of cows and high producing qualities. The first group includes the animals with the conception at the age of 18-19 months; the second group comprises of the cows with the conception at the age of 20-21 months, and the cows in the third group were conceived at the age of 22-23 months. The impact of fatness among the milk cows on their milk productivity and the quality of milk organize 4 groups of second conception ani-mals and older on the basis of analogy with 22 cows per group on average. The first group consisted of the animals with the fatness score of 2.0-2.5; the second group included the animals with 2.6-3.0 scores; the third one – 3.1-3.5 scores and the fourth one – 3.6-4.0 scores. With moderate feeding and treatment conditions blood correlation in crossing Black Spotted cows with Holstein seed bulls is justifiable by ½ and ¾. Usage rate for the milk cows depends on the duration of service, dry periods and carving interval. Pre-liminary periods become longer with the lactation and milk production, but the milk production intensity and the number of calves decrease for the period of cow household usage. The age of 18-19 months for the first conception is the most economi-cally profitable. Crossing the Black Spotted cows with Holstein seed bulls positively impacts on the technological qualities of cows’ udders. Higher values of milk yield and long usage could be observed among the cows with their fatness of 3.6-4.0 scores, i.e. 4584 kg. The cows with 3.6-4.0-score fatness had the longest working life. Key words: Holstein breed, Black Spotted breed, blood, milk production, fatness.

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