Luminiţa Doliş


RESEARCH REGARDING PRODUCTION AND REPRODUCTIVE TRAITS ON THE FIRST FOUR LACTATION, IN ROMANIAN BLACK AND WHITE DAIRY COWS

Luminiţa Doliş, I. Glcă, M. Doliş

Abstract
Through this study, we proposed evaluation the productive and reproductive traits in a number of the 1196 Romanian Black and White cows, raised in four farms in semiintensive and intensive system. Thus, based on data on milk production and centralized, we obtained the largest quantity of milk in lactation second 7151.38 106.27 kg, with 4.70 0.2% fat, respectively, 300.61 4.70 kg fat, 3.36 0.01% protein, 240.61 3.62 kg respective proteins. Regarding productive precocity, first lactation represents 97.76% of maximum lactation. In terms of breeding characters, age at first calving was 876.79 3.16 days, showing a good reproductive precocity. Calving interval and service period have closes values for optimal values. Study parameters are strongly influenced by technology which makes the effect of genetic improvement to be diminished.

Key words: cows, milk production, lactation