QUANTITATIVE GENETICS RESEARCHES ON THE B.N.R. POPULATION REARED IN THE PRIVATE FARMS FROM THE NORTH-EASTERN AREA OF ROMANIA

V. Ujica, V. Maciuc, Rodica Danaila, St. Creanga, I. Nistor

Abstract
The research has been conducted in terms of household and semiintensive operating Black and White Romanian cows from Moldova region. The primary data came from a database of OARZ: Iasi, Bacau, Botosani, Suceava, Vaslui and Vrancea, obtained by control of production, supplemented by direct observations of some personal holdings taken in research. The heritability for milk quantity varies between 0.21 and 0.37 for the Black and White Romanian cows from Bacau and Vrancea. The fat quantity has a medium value, between 0,27 si 0,38 %. The percentaj of fat and protein from milk is strongly genetically determinated and in our case the coeficient of heritability has value between 0.57 for the Black and White Romanian cows from Iasi and 0.83 for the Black and White Romanian cows from Vaslui. The quantity of milk is strongly and positively correlated with the quantity of fat (r = 0.99) and the quantity of protein from milk (r = 0.85). Between the quantity of milk and other characters for milk quality and reproduction indices the correlations were negative and had low value for: fat content in milk r = -0.24, protein content of milk r = -0.23, dry period r = -0.35 etc.

Key words: Cows, Black And White Romanian, Milk, Heritability, Correlation