CONTRIBUTIONS REGARDING THE STUDY OF MILK PRODUCTION IN FARMS WITH ROMANIAN BLACK PIED COWS BELONGING TO A.G.C.T.R. - ROMANIA
V. Maciuc, V. Ujică, I. Nistor, C.E. Nistor, P.T. Nagy
Research was carried out on a number of 4208 BNR cows population from private farms situated in 11 Counties, belonging to AGCTR. Using the data from the Official control were analysed: period of lactation, milk production per total lactation, normal and at maturity equivalent, milk content in fat and proteins, function of farm, county association, and total population. Data obtained show the following: milk production per normal lactation was 5822.73 Kg for the entire population, with limits between 4413.60 Kg for the BNR population from Ilfov County and 7364.80 Kg from Vaslui County. Between the county associations the differences were significant, even between the farms from the same county. Per total population, there were six counties with performances over the average, the most performing being Târzii and Badeana farms from Vaslui County, which overcame with 26.48 % the population average. Milk content in fat was 3.90% and the protein one was 3.41% but with a great variability (V% = 22.98% for fat and 21.45 %for protein). Period of total lactation was on average of 263.84 days, which influenced the performance of milk production. In the studied farms the individual variability was very high, with a maximum of 18476 Kg milk for a cow from Târzii farm, Vaslui County. The presence of this plus variables and pronounced variability in every farm are favourable for positive selective pathways and real possibilities for genetic improvement of the studied flocks.
Key words: milk production, cows, lactation, genetic improvemnet