RESULTS REGARDING THE STUDY OF REPRODUCTION INDEXES AT ROMANIAN BLACK PIED COW POPULATION BELONGING TO AGCTR - ROMANIA
V. Ujică, V. Maciuc, I. Nistor, C.E. Nistor, P.T. Nagy
Were taken in study the farms with Romanian Black Pied (BNR) cow population belonging to AGCTR (General Association of Romanian Cattle Breeders) being in the COP (official production register) for 2011-2012, at which were analysed: age at first calving (VPF), number of artificial insemination (IA) for one gestation, range of lactation, calving interval (CI), service-period (SP) and mammary repose (RM). Cows' number was of 5973 in 1-13 lactation with an average of 2.48 lactations. The average age at first calving was 29.38 month with variability between 23 and 46 months. Number of IA1 for one gestation was 1.11 with limits between 1-4 IA1, most of which being recorded in Covasna County farms (1.66), Olt County (1.41) and Constanţa County (1.22). The average service period (SP) was 80.11 days, pregnancy installation being achieved in the first 3-4 heat cycles. Calving interval (CI) was 357.93 days, for obtaining one and only a veal per year, which shows a good management of reproduction function. Mammary repose was 66.31 days, cows being weaning with two months before calving, without extending the period of lactation even at cows with high daily production. The conclusion drawn from the study proves the genetic value of the BNR cow population and a good management of the technological and exploitation factors.
Key words: reproduction indexes, cows, management, technological factors