RY Genetic correlations for milk, beef and fertility traits are calculated on the basis of correlations between breeding values of bulls in the Simmental and Holstein cattle. The correlations between independent breeding values for each trait are calculated as the residual from procedure GLM/SAS respecting effects of birthyear and group of tested bulls. Genetic correlation is approximately equal to the correlation of breeding values in the case, that both traits are measured on the same animal, or to the correlation of breeding values corrected by reliability in the case, that each trait is measured on another animal. Database covers all tested bulls bom from 1979 till 1992. The highest genetic correlations were found within groups of traits (milk production and contents, and body weight and daily gains). Between groups of traits there are only low correlations. 

P. Safus, J. Pribyl, V. Cermak

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 447–448, 1998
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