STUDY ON THE CORRELATIONS BETWEEN DIFFERENT PARAMETERS AND EVALUATION OF DAIRY FARMS

Verginia Gaidarska, Ts. Harizanova–Metodieva, Tania Ivanova

Abstract: The aim of the paper is to study the correlation coefficients between the different parameters for evaluation of dairy
farms. It was investigated 17 dairy farms from different regions in Bulgaria. The coefficients of correlation were calculated
between: number of cows, status of the herds, milk productivity, content of protein and fatty substances in milk, service
period, reproduction, health status, feeding, milking, hygiene, economics and management of farm. The coefficients of correlation
were cоmputed with SPSS 9.
As a result of the study, it was found that with the increase in the number of cows, the economics and management also
increase; improved hygiene, microclimate, reproduction, feeding and management lead to an increase in average milk yield;
with the increase in multiplicity of milking, fatty substances in milk reduce; the improvement of reproductive performance
of the animals leads to shorter service period; with an increase in farm hygiene the microclimate improves and others.

Keywords: correlations; dairy cattle breeding; economics; evaluation of dairy farms; management

Date published: 2023-01-31