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Calculating Selected Reproductive Indices: Recommendations of the American Association of Bovine Practitioners

Department of Food Animal and Equine Medicine, North Carolina State University, Raleigh 27606
Lilly Research Laboratory, Greenfield, IN 42140
Herd Technology, Chino, CA 91710
Dairy Records Processing Center at Raleigh, Raleigh, NC 27695
Veterinary Medical Teaching and Research Center, University of California at Davis, Tulare 93274
Carnation, WA 98014
Dairy Veterinarians Group, Argyle, NY 12809
Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Ontario, CA 91764
Merced, CA 95340
Department of Animal Science, University of Minnesota, St. Paul 55108
Department of Large Animal Clinical Science, University of Minnesota, St. Paul 55108

This paper presents the report of a committee of the American Association of Bovine Practitioners recommending methods for calculating several basic indices of reproductive performance on dairy farms. Indices presented are: overall reproductive performance, intensity of estrus detection, conception efficiency, pregnancy losses. reproductive culling, and reproductive efficiency in herds using a bull. Data from a hypothetical dairy herd are provided and example indices are calculated.

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