Data consisted of 44,707 first lactation records classified in 5 breed groups based on the proportion of Holstein genes. Production, fertility and health traits were considered. Least sguares constants for breed groups were estimated after adjusting for herd- year and month of calving effects. A multiple regression model was used to partition the breed group effect into one component representing a combination of additive and heterosis effects and a second component more complex but probably dominated by the recombination effect. The additive effect for Holstein plus the heterosis effect was significant for all traits considered but parturition problems, and was equal to between 4% and 10% of the mean for production and fertility traits and equal to about 30% of the mean for health traits. The second factor, dominated by the recombination loss effect, was important for yield and health traits and was equal to 5% and 20% of the mean, respectively.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 95–98, 1990
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