Phenotypic Correlations among Milk Yield and Chemical Composition per Normal Lactation in Romanian Black and White Breed

Abstract

In this study we have established phenotypic correlations between quantitative and qualitative indices of normal lactation milk production in Romanian Black and White breed for 125 lactations. The correlation coefficients and their statistical significance were calculated with STATISTICA program. Between the amount of milk and chemical components from milk there were values of correlation coefficient over 0.900. Also, between these characters was a very significant positive correlation (p0.05). Between the percentage values of fat, protein, lactose, fat dry matter and total dry matter were obtained highly significant correlations (p <0.001), ranging from r=0.510 between fat percentage and the percentage of lactose and r=0.883 between the percentage of defatted dry matter and total solids.

Keywords

• chemical components
• milk quantity
• phenotypic correlations
• romanian black and white breed