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Journal of Dairy Science Vol. 43 No. 9 1343-
© 1960 by American Dairy Science Association ®
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Changes in Repeatability with Changes in Herd Environment

R. R. Shrode1, B. H. Stone2, I. W. Rupel3 and R. E. Leighton3

Texas Agricultural Experiment Station, College Station

ABSTRACT

In many situations a decrease in environmental variance resulting from a reduction of temporary environmental differences among individual herd members would seem logically to accompany improvement in herd environment. Such an effect would be reflected in increased estimates of repeatability and heritability. In recent years there has been increasing interest in the effect of level of environment on the heritability of various quantitative traits. Considerable evidence has accumulated to the effect that the success of selection for certain economic traits in farm animals is greatly dependent on the environment in which selected individuals develop and the environment in which they are used as breeding stock. A recent interesting example of the effect of environmental level on variability through an influence on fitness traits has been presented by Vetukhiv and Beardmore (1).

The present note pertains to a statistical study of 1,564 lactation records from 523 cows (262 Jerseys and 261 Holsteins) belonging to 17 birth-year groups in the herds of the Agricultural and Mechanical College of Texas and the Texas Agricultural Experiment Station.

FOOTNOTES

1 Present address: DeKalb Agricultural Association, Inc., Sycamore, Illinois.

2 Present address: Texas Agricultural Experiment Station, Substation No. 2, Route No. 5, Tyler, Texas.

3 Department of Dairy Science.






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Copyright © 1960 by the American Dairy Science Association ®.