EVALUATION OF MILK PRODUCTION FOR SOME CATTLE POPULATIONS REARED IN THE NORTH-EAST AREA OF ROMANIA

S. Olaru, I. Gîlcă, V. Maciuc, C.E. Nistor, V. Ujică

Abstract
    It is well known the fact that function of maintenance way, exploitation type animals could or couldn't manifest their biological potential. Thus it is important to know how will react dairy animals of different breeds (Romanian Black Pied, Brownish and Romanian Pied) at free stabulation in a private farm.
    To reach the proposed goal, were studied on productions of total lactation and normal lactation characters connected with milk qualitative and quantitative production: milk quantity, fat quantity, fat content, protein quantity and content in milk. Also a remarkable importance is given to the age of first calving, reason for studying it.
    The obtained primary data from farm were statistically processed and interpreted. Were aimed to obtain position and variation estimators (arithmetic mean , respectively variance S², standard deviation s, standard deviation of mean and variation coefficient V%).
    The obtained data show the following aspects.
    Age of first calving was 982.90 days, with variations between 545 days and 1395 days (V%=15.89).
    Milk production was 5440.89 kg at 1^st lactation, 5043.52 kg in 2^nd lactation and 4764.19 kg in 3^rd lactation.

Key words: cows, productive performances, free stabulation