Abstract #278

Section: Animal Health
Session: Animal Health III
Format: Oral
Day/Time: Tuesday 9:45 AM–10:00 AM
Location: 324
# 278
Neonatal management factors on dairy farms associated with mortality on veal farms.
D. L. Renaud*1, D. F. Kelton1, S. J. LeBlanc1, D. B. Haley1, T. F. Duffield1, 1Department of Population Medicine, University of Guelph, Guelph, ON, Canada.

The objective of this study was to determine neonatal management risk factors on dairy farms associated with mortality on veal farms. From April to October 2016, 52 dairy farms that supply male calves to 2 veal operations were visited. During the visit, a questionnaire was administered covering all areas of calf management, calves 1–10 d of age were examined using a standardized health scoring system and blood was collected to test for passive transfer of immunoglobulins. The veal calf mortality risk for each dairy farm was calculated based on the number of calves shipped and the number that died during 2016. To adjust for differences in calf mortality at the 2 veal operations, a facility-adjusted mortality rate was calculated for each dairy farm, and the farms were classified as high or low mortality farms. Using the high and low mortality risk outcome, a logistic regression model was used to assess farm risk factors. Suppliers to veal farm 1 had a mean mortality risk of 9% in 2016 and 39% of calves (n = 27) examined on the dairy farms supplying veal farm 1 had an identifiable health abnormality. In contrast, suppliers to veal farm 2 had a mean mortality risk of 3% in 2016 and 29% of calves (n = 33) examined on the dairy farms supplying veal farm 2 had an identifiable abnormality. The proportion of calves with failure of passive transfer on all dairy farms was very low, with only 13% of calves (n = 24) tested having a serum IgG < 10mg/ml. Feeding stored (refrigerated or frozen) colostrum (P = 0.03) compared with fresh colostrum, bedding male calves on wood shavings (P = 0.03) or chopped straw (P = 0.04) compared with long straw on the source dairy farm, and the herd veterinarian not frequently asking about the health and performance of the calves (P = < 0.01) were all positively associated with the dairy farm being classified as a high mortality farm. Checking the calving pen less frequently during the day (P = 0.02) compared more frequently during the day was negatively associated with being classified as a high mortality dairy farm. The results of this study suggest that male calf management practices on dairy farms have an impact on mortality during the growing period on veal farms.

Key Words: male calf, management, mortality