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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. [ABSTRACT FROM AUTHOR]

Were analysed the productive performances for 1619 Romanian Black Pied (RBP) primiparous, representing 36.21% from total population belonging to AGCTR from 17 Counties. Except Constanta County, primiparous cows represent a high proportion in the age structure of the farms and have a superior genetic value towards previous generations. Average milk production on normal lactation at the analysed batch was of 6992.88 kg milk, with the superior limit of 16095 kg milk and standard deviation s = 1096.88 kg. Length of total lactation has a medium value of 350.91 days, gestation period of 286 days and number of insemination for one gestation of 1.07, with limits ranking between 1 and 5 artificial insemination, and age at first calving of 28.4 month. Those performances enlighten the superior genetic value of primiparous and the perspectives of accomplishing of some productive indexes at the level of the countries with valuables nucleus of Friesian cows. [ABSTRACT FROM AUTHOR]

On a population of 4487 BNR cows, from 17 counties belonging to A.G.C.T.R. (General Association of Romanian Cattle Breeders) were evaluated the main reproductive indicators on the basis of data from official control in farms. Were evaluated the following indicators: age at first calving (VP), number of artificial inseminations for one gestation, duration of gestation, service-period, mammary repose and calving interval (CI). From analysis of mean values could be observed that mean age at first calving was in 29.57 days, analysed population having precocity under the standard of Friesian breed. Number of inseminations for one gestation was 1.83 i.a., at the farms level being recorded an efficient management of frozen seminal material. Reproduction indicators: CI, SP, RM and DG, had mean values which prove that reproduction function was well technically managed, in each year obtaining one calf from each cow. [ABSTRACT FROM AUTHOR]