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Journal of Dairy Science Vol. 68 No. 7 1793-1803
© 1985 by American Dairy Science Association ®
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Factors Affecting Reproductive Performance of Dairy Cows1

D. A. Coleman2, W. V. Thayne and R. A. Dailey3

Division of Animal and Veterinary Sciences, West Virginia University, P.O. Box 6108, Morgantown 26506-6108

3 Reprint requests.

ABSTRACT

We conducted two studies to determine how herd management practices and traits of individual cows affect performance of the herd and of the cow within a herd. Management practices, reproductive performance of the herd, and relationships between management and reproductive performance were characterized on 83 dairy farms with 7596 cows. Data included 21 management variables (e.g., facilities, herd health program, estrous detection program) and 8 performance variables obtained from Dairy Herd Improvement or unofficial records (e.g., size of herd, production, days open). Although varying among herds, annual average herd incidences of reproductive disorders and reproductive performance were similar to those reported. Managerial practices influenced incidences of retained placenta and uterine infection, days open of cows not bred and of all cows, services per conception, and percentages of herd open more than 100 days and culled for low production. Veterinarian was the most consistent variable influencing herd reproductive performance. Data also were collected from production and lifetime records of 2532 cows in 19 herds. Reproductive performance was affected by season of calving, production, maturity, and reproductive disorders. Several cows with extremely poor reproductive records were maintained.

FOOTNOTES

1 Published with the approval of the Director of the West Virginia Agricultural and Forestry Experiment Station as Scientific Article No. 1862. This research was supported by funds appropriated under the USDA-SEA Animal Health Research Section 1433 and Hatch Project 224 (NE72).

2 Alabama Cooperative Extension Service, Animal and Dairy Sciences Building, Auburn University, Auburn, AL 36849.






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