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Journal of Dairy Science Vol. 50 No. 4 550-554
© 1967 by American Dairy Science Association ®
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Estimation of Genetic Trends in Simulated Data1

R. W. Everett2, C. E. Meadows and J. L. Gill

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

Simulated records of 1,556 2-yr-old dairy cows with dam information were used to test the accuracy of a modified method of Smith (4) for estimation of genetic and environmental trends in production. Of the total number of cows, 1,008 were daughters of 128 bulls that sired daughters in two or more years. Accurate estimates of actual genetic and environmental trends were obtained by pooling the regression of production on time within sires according to the inverse of the variance of each regression. The merits of estimates of genetic parameters obtained are discussed. Corrections for the effects of culling and age of dam are presented.

FOOTNOTES

1 Journal Article no. 3933 from the Michigan Agricultural Experiment Station.

2 Present address: Department of Animal Science, Cornell University, Ithaca, New York.






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Copyright © 1967 by the American Dairy Science Association ®.