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Journal of Dairy Science Vol. 56 No. 6 799-804
© 1973 by American Dairy Science Association ®
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Immediate Effects of Changing Herd Size upon Milk Production and other Dairy Herd Improvement Measures of Management1

C. A. Brown2 and J. M. White

Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061

ABSTRACT

Consecutive yearly herd averages were compared to determine the effects of changing herd size on production and management variables for 13,614 Dairy Herd Improvement Holstein herd average records completed between 1965 and 1970. Herd average milk production increased by 56 kg per year. Changes in herd size had a marked effect on average milk production the following year. This effect was dependent on herd size prior to change with larger herds showing serious losses in production as herd size increased. Conversely, smaller herds were less affected as herd size fluctuated. Income over feed cost and other management variables showed trends similar to those for milk production.

FOOTNOTES

1 Supported in part by a grant from the Virginia Agricultural Foundation.

2 Present address: Bloomsburg, Pennsylvania 17815.






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Copyright © 1973 by the American Dairy Science Association ®.