STUDY ON THE correlations between DIFFERENT parameters AND EVALUATION OF DAIRY FARMS | ПРОУЧВАНЕ НА КОРЕЛАЦИИТЕ МЕЖДУ РАЗЛИЧНИ ПОКАЗАТЕЛИ ЗА ОЦЕНКА НА МЛЕЧНИ ФЕРМИ
2013
Gajdarska, V., Institute of Animal Science, Kostinbrod (Bulgaria) | Kharizanova-Metodieva, Ts., Institute of Animal Science, Kostinbrod (Bulgaria) | Ivanova, T., Institute of Animal Science, Kostinbrod (Bulgaria)
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.
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