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Milk yield composition properties and technological qualities of milk of native stara zagora ewes and crossbreds with east friesian rams iii. phenotypic correlations and regressions


Milk yield composition properties and technological qualities of milk of native stara zagora ewes and crossbreds with east friesian rams iii. phenotypic correlations and regressions



Zhivotnov"dni Nauki 25(5): 33-39



Purpose of the study was to establish phenotypic correlations and regressions between quantity and composition as well as relationships between individual components of milk of the Native Stara Zagora ewes and crossbreds with East Friesian rams, reared in the flock of the Institute of cattle and sheep breeding-Stara Zagora. The study was conducted in 1986 with two groups (each of 40 ewes) in first lactation equalized according to time of lambing (first week of February). Milk samples were analyzed in the laboratories of the department ''Dairy Science and Bacteriology'' at the Higher Institute of Zootechnics and Veterinary Medicine in Stara Zagora. It was found that: -the phenotypic correlations between milk production and quantity of the milk components, protein and fat, were high and significant for the two studied groups of ewes. -the correlations between milk quantity (in liters) and its composition (in%) were negative and low to moderate. during the three periods of a lactation in the phenotypic correlation between casein (in%) and total protein (in%) was highest. -the estimated regression coefficients confirmed the established phenotypic relationships. Fat and protein indexes (in percentage) of milk of purebred Native Stara Zagora sheep and their crossbreds were significant and showed a tendency towards enhancement at the end of a lactation period. That finding arose a definite interest in eventual working out of linear regression equations for prediction of total protein (in%) or fat (in%) to be employed in qualitative control of milk.

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