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Efficacy of crosses of Bulgarian Simmental cows with Ayrshire, Holstein Friesian and Black Pied bulls



Efficacy of crosses of Bulgarian Simmental cows with Ayrshire, Holstein Friesian and Black Pied bulls



Zhivotnov' dni Nauki 31(5/6): 16-19



During the period 1985-1989, milk production characteristics were studied in a total of 1191 1st-lactation cows of 6 different genotypes (pure Bulgarian Simmental BS x Ayrshire BS x (A x Black Pied , BS x (A x Holstein Friesian , BS x HF and BS x BP). Dispersion analysis of the effects of genotype showed that 1st lactation milk yield varied from 2326+or-68.49-3449+or-37.91 kg, milk fat content from 3.83+or-0.024-3.99+or-0.011% and milk fat yield from 89.08+or-0.92-136.70+or-1.49 kg.

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