STUDY FOR INTRAPOPULATIONAL STRUCTURE TO A BLACK AND WHITE ROMANIAN COWS POPULATION

The research has been conducted on 210 cows bred in Iasi area. We analyse production features for cows, cowsʹ ascendancy and for each group of paternal half-sisters. Consequently BNR population taken in study have a maximum production of milk in the third lactation, with an average of 6670 kg with 4.13% fat and 3.34% protein, and the minimum milk production was registered in the first lactation (6108 kg milk with 4.12% fat and 3.34% protein). The cowsʹ mothers have an average of milk production of 7003.44 kg; the paternal grandmothers have an average production of 10877 kg milk and the maternal grandmothers have 6925.35 kg milk. The daughters of the used bulls for reproduction had good productive performances, remarking the daughters of 51454 bull (7019.33 kg milk), 51131 bull (6567,17 kg milk), and the smallest performances being recorded for the 51459 bull (5010.43 kg milk).