Issn: 2776-0979, Volume 3, Issue 12, Dec., 2022 899 dependence of milk productivity of holstein cows on living weight

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ISSN: 2776-0979, Volume 3, Issue 12, Dec., 2022
 
899 
DEPENDENCE OF MILK PRODUCTIVITY OF HOLSTEIN COWS ON 
LIVING WEIGHT 
U. T. Rakhimov 
E.G.Pardaev., 
R.X.Mirzayev., 
G.S.Abduvaliyeva., 
J.E.Xurramov
Samarkand State University of Veterinary Medicine, Livestock and Biotechnologies 
 
Abstract 
Studies have shown that the milk yield of Holstein cows in the first lactation is 
organically dependent on the live weight at the first birth. The average milk yield per 
cow in lactation I was 489.7 kg, which is 282.0 and 134.9 kg higher than the average 
450.3 and 470.1 kg cows, respectively, and the 4% milk yield was 243.6 and 209.7 kg 
higher, respectively. found to be 
 
Keywords:
milk, live weight, productivity, lactation period, 4% milk, milk fat 
Holstein cows are the most productive in the world in terms of milk yield. Their milk 
productivity depends on the sensitivity of feeding, storage conditions, many external 
environmental factors. At the same time, the level of milk productivity of cows is 
inextricably linked to live weight [1-5]. Determining the optimal live weight of cows 
to ensure high milk productivity is of great scientific and practical importance in 
ensuring an increase in milk production. Therefore, it is important to study the effect 
of this important factor on the milk yield of Holstein cows. With this in mind, we 
studied the milk yield level of Holstein cows in relation to their live weight at first 
birth. 
The research was conducted in a herd of Holstein cows of the cattle breeding farm 
"K.Eldor" in Pastdargom district of Samarkand region. Three groups of Holstein 
purebred cows in I lactation were selected for the experiment based on the 
requirements of similarity traits. Group I was allocated 460 kg at the first birth, group 
II 461-480 kg and group III 481 kg and above live weight cows. The feeding and care 
conditions of the cows in all groups were the same. The cows were fed taking into 
account the milk yield, live weight and physiological condition. The milk yield of cows 
was studied in generally accepted methods in zootechnics. Dry matter in milk, 
skimmed milk powder, milk sugar were studied by the methods of P.V Kugenev, N.V 
Barabanshchikov (1978). 

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