Features of growth and development of heifers of the Holstein breed

The purpose of the study was to study the dynamics of growth, development and reproductive qualities of Holstein heifers. The results of the analysis showed that under the conditions of a breeding reproducer, the live weight index of replacement young animals is higher than the breed standard in tension for the entire growing period. The age of the first fruitful insemination is 14.35 months (on average). Feeding replacement heifers on the farm is not balanced in terms of energy and digestible protein, it is necessary to reduce the proportion of concentrates in the diets of heifers from 3 to 15 months of age and increase the energy level in the diets of calves of the age group from birth to 3 months of age by introducing an energy feed supplement. This will allow more economical use of concentrated feed and reduce the cost of raising heifers. With intensive growth of heifers, it is important to prevent obesity by controlling live weight and average daily gains in live weight, which should not exceed 850 g / day.