By Christiansen, K. H. and Danaye-Elmi, C. and Gardner, I. A. and Heron, B. R. and Hird, D. W. and Sischo, W. M. and Utterback, W. W., Preventive Veterinary Medicine, 1990
Description
During 1986 and 1987, morbidity, case-fatality, and culling rates were estimated for endemic disease conditions in 43 randomly selected California dairy farms. Data were collected mainly by farmer interview. Age- specific mortality rates were: calves 22.8 per 1000 calf-months at risk; young stock 1.2 and cows 2.0 per 100 animal-years at risk. No bulls died during the observational period. For calves, diarrhea/enteritis and pneumonia had the highest incidence rates, 115.8 and 76.5 per 1000 calf-months at risk, respectively. Average incidence rates per 100 cow-years for the five most commonly reported cow diseases were: mastitis 30.3; infertility 7.9; metritis 7.0; footrot 5.5; retained placenta 4.7. The highest case-fatality rate was 32% for cows with traumatic reticulitis (hardware disease). About 25% of all cows were culled. Low production, infertility, and mastitis accounted for 87.6% of all culled cows. Characteristics of participating herds and diagnostic criteria are presented. Limitations of the data and of the collection methods are discussed
During 1986 and 1987, morbidity, case-fatality, and culling rates were estimated for endemic disease conditions in 43 randomly selected California dairy farms. Data were collected mainly by farmer interview. Age- specific mortality rates were: calves 22.8 per 1000 calf-months at risk; young stock 1.2 and cows 2.0 per 100 animal-years at risk. No bulls died during the observational period. For calves, diarrhea/enteritis and pneumonia had the highest incidence rates, 115.8 and 76.5 per 1000 calf-months at risk, respectively. Average incidence rates per 100 cow-years for the five most commonly reported cow diseases were: mastitis 30.3; infertility 7.9; metritis 7.0; footrot 5.5; retained placenta 4.7. The highest case-fatality rate was 32% for cows with traumatic reticulitis (hardware disease). About 25% of all cows were culled. Low production, infertility, and mastitis accounted for 87.6% of all culled cows. Characteristics of participating herds and diagnostic criteria are presented. Limitations of the data and of the collection methods are discussed
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