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Abstract
A computer-based on-farm surveillance system of dairy cow abortion was presented as a means of improving diagnosis and knowledge of bovine abortion. Abortion was defined as fetal death between 42 and 260 days of gestation. Three measures of abortion were used: abortion density, estimated proportion aborting and age-specific hazard of fetal death. All three measures considered changes in the size of populations at risk due to censoring and abortion. Secular and seasonal rates and the testing of hypotheses concerning abortion were illustrated with data from seven California dairies that used on-farm computers. Potential biases and other considerations in abortion surveillance were discussed.
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