Abstract #270

# 270
Factors associated with veal calf morbidity on an Ontario grain-fed (red) veal operation.
Kayla J. Scott*1, David L. Renaud1, Todd F. Duffield1, David F. Kelton1, 1University of Guelph, Guelph, ON, Canada.

Health status at arrival at veal facilities may be an important predictor of calf morbidity and performance, as substantial disease occurs early in the calves’ growing period on veal operations. The objective of this prospective cohort study is to explore associations between health attributes measured at arrival at a veal rearing facility and morbidity risk. Calves were evaluated immediately at arrival using a standardized health scoring system (Calf Health Scorer App), blood was collected to measure serum total protein (STP), and weight was measured at arrival. A mixed logistic regression model was built to evaluate factors associated with morbidity <21 d following arrival. Between January and July 2017, a total of 590 Holstein calves of unknown age were evaluated. In the first 21 d following arrival, 68% of calves were treated for either respiratory disease or diarrhea, and 5% died. There were 5 variables significant in the final model evaluating the association between morbidity and conditions identified at arrival. Calves without a sunken flank, those that weighed more at arrival, or those that had a higher concentration of STP had reduced odds of morbidity. Calves that were moderately dehydrated had a reduced odds of being treated for disease compared with a non-dehydrated calf. More specifically, 38% of calves presented with sunken flank, 25% were below 95lbs upon arrival, failure of passive transfer was present in 32% of the calves, and moderate dehydration was present in 7% of the calves. The results of this study indicate that risk factors for morbidity can be identified upont arrival at a veal facility, and interventions may be warranted to reduce morbidity. Future work will evaluate the efficacy of interventions to reduce the prevalence of these risk factors before arrival, so that veal calf health and welfare can be improved.

Key Words: male calves, dairy, morbidity