Yusiuk T. Improvement of methods of assessment of dairy efficiency of mares

Improvements of ways of assessment of dairy efficiency of mares are stated in the thesis. Morphometric indicators of mares’ udder and their interrelation with milk yields are investigated. On the basis of multiple correlation analysis between udder measurements and control milk yields, technological index for forecasting an average daily milk yield is calculated. Service period and animal’s age were included in the formula for predicting dairy productivity and optimizing the milking stock, during conditions of their seasonal milking. Correlation between milk yield of mares and measurements of foals for the first month of life: r=0.66; р<0.001 that allowed to offer a method of determination of dairy efficiency of mares on measurements of foals. The correlation coefficientbetween the actual and predicted values is equal 0.65 and is reliable at the level р<0.001; F(1, 40)=30.58. In order to increase milk productivity, it is proposed to optimize the number of dairy mares according to the predictions of the formula on the following indicators: service period – 45 days, age of mares – 11 years, predicted milk yields total in 2114 liters, which is 109 liters more than the average milk productivity of 2004.5 liters, by value of 4469 UAH. For the purpose of increase in dairy efficiency and optimization of structure of a milking stock, it is offered: to use a formula for forecasting of dairy efficiency for service period and age of mares, transition to technology of milking at an interval of three hours.