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Effect of colostrum replacer to ameliorate a disease bout in preweaned calves on an automated feeder.

M. Cantor




Effect of colostrum replacer to ameliorate a disease bout in preweaned calves on an automated feeder.
M. Cantor*1, M. Woodrum Setser1, D. Renaud2, J. H. Costa1. 1University of Kentucky Lexington, KY, 2University of Guelph Guelph, ON, Canada.

Changes in feeding behavior monitored through an automated milk feeder (AMF) have been associated with disease development. The objective of this study was to determine if an intervention with 1 dose (375g) of colostrum replacer (CR; PreMolac Plus, Zinpro, MN) or a placebo milk replacer (28% CP 20% fat, Cows Match, Land O Lakes, MN) fed across 3 d (1L 125g/d) to triggered alarm calves (n = 110 alarms; n = 57 placeb0, n = 53 CR) could lower the likelihood of a disease bout occurring (ameliorate) before weaning. An algorithm was set to trigger an alarm when negative deviations of milk intake or drinking speed were detected in relation to a baseline average of 12 d. Calves (42 placebo;42 CR) were enrolled on the AMF at age 4.0 � 2.0 d (mean � sd), were offered 10 L/d milk replacer and had ad libitum access to starter measured by automated feeders. Calves were scored daily for bovine respiratory disease (BRD) and diarrhea and weighed and scored using a lung ultrasound 2x weekly. A BRD score >4 and an area of consolidated lung >2.9 cm2 was considered a BRD bout. Treatments were not different on the d before alarm by health status, weights, and ages, alarms were triggered at average 32.1 � 12.5 d of age (mean � sd). The effect of CR to ameliorate BRD and diarrhea were calculated with logistic models using SAS (9.4), time was a fixed effect, with milk intake as a co-variate. The effect of CR on ADG was determined using a linear mixed model with dam parity and BRD status as co-variates, repeated by d and calf, with birth date as a random effect. Post-intervention, placebo calves had a 1.64 (95% CI:1.10—2.43) times greater odds of having a BRD bout compared with CR calves for the 7-d following intervention. Moreover, placebo calves had a 1.50 (95% CI: 1.10—2.1) times greater odds of having lung consolidation than CR calves. No difference was found in the likelihood of diarrhea (OR 0.91; 95% CI: 0.73—1.12) or ADG (placebo 0.73 � 0.07 kg/d) and CR (0.70 � 0.08 kg/d) between interventions. Results suggest CR may reduce the likelihood of a BRD bout in calves, but not influence growth. Future research should examine which properties of CR ameliorate BRD bouts.

Keywords: bovine respiratory disease, performance, supplement.

Biography: Melissa Cantor is a third year PhD student at the University of Kentucky. Her dissertation is investigating the use of precision dairy technologies to detect disease in dairy calves with Dr. Costa. At the time of this abstract submission she has published 2 research articles, 1 technical note, 2 book chapters, 2 invited reviews, and 1 conference proceeding. Previously, she was a dairy herd technician working on milk quality with Agsource Dairy in Wisconsin. She completed her Masters of Dairy Science at the University of Wisconsin-Madison in 2015.