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Journal of Dairy Science Vol. 62 No. 2 310-315
© 1979 by American Dairy Science Association ®
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Repeatability of Milk and Fat Yield for Cows with Changed Environment1

P. A. Oltenacu2, C. C. Olson3 and C. W. Young

Department of Animal Science, University of Minnesota, St. Paul 55108

ABSTRACT

Repeatabilities within and between herds for milk and fat yield were estimated by product-moment correlations for 2,232 Holstein cows from Minnesota Dairy Herd Improvement files with at least two records in each of two herds. For milk and fat yield, repeatabilities within herd for consecutive records were .47 and .44, and between herds repeatabilities were .37 and .36 for consecutive records and for nonconsecutive records they were .27 and .24.

The heritability of differences between herds was estimated . l 6 from one minus the regression coefficient of the difference between two records by the same cow in two different herds on the difference between the adjusted herdmate averages in the two herds.

A larger data set of 14,111 cows with 45,011 records in two or more herds characterized cows moved from one environment to another. Among cows sold after first lactation, reasons for disposal were 40% for dairy purposes, 50% for low production, and 10% for others. Among cows sold after two or three lactations, reasons for disposal were 50% for dairy purposes, 40% for low production, and 10% for others.

FOOTNOTES

1 Scientific Journal Series Paper No. 10058, Minnesota Agricultural Experiment Station, St. Paul 55108

2 Department of Animal Science, Cornell University, Ithaca, NY 14853

3 Department of Dairy Science, University of Wisconsin, Madison 53716.






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Copyright © 1979 by the American Dairy Science Association ®.