Abstract #300

# 300
Effect of solid feed location on feed consumption and growth of dairy calves.
Sarah D. Parsons*1, Ken E. Leslie2, Michael A. Steele3, Trevor J. DeVries1, 1Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada, 2Department of Population Medicine, University of Guelph, Guelph, ON, Canada, 3Department of Agricultural Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.

The objective of this study was to investigate how the location of solid feed offered to dairy calves affects their intakes and growth during the milk-feeding (d 1–42), weaning (d 43–56), and post-weaning (d 57–70) periods. Sixty Holstein heifer calves were housed in individual pens (152 × 167 cm) and randomly assigned to 1 of 2 treatments: solid feed adjacent to the milk source or solid feed opposite from the milk source within their pen. All calves were offered 12.5L/d of milk replacer (in 2.5-L meals, 5×/d) by an automated rail milk feeder (AMF) until d 43, when they were gradually weaned off milk by d 57. All calves had access to ad libitum water from birth and starter ration of concentrate (95%) mixed with chopped (2.54 cm) wheat straw (5%) from d 5. At d 57, calves had access to only water and starter ration and were monitored to d 70. Feed and water intakes were measured daily and milk intakes were recorded automatically by the AMF. Calf BW was measured 2×/wk. Data were summarized by period and analyzed in repeated measures general linear mixed models. Feed adjacent to the milk source tended to result in greater DMI (0.067 vs 0.056 kg/d; SE = 0.005; P = 0.09) during the milk-feeding phase. Feed consumption did not differ between treatments during the weaning (adjacent = 0.81 kg/d, opposite = 0.75 kg/d; SE = 0.056; P = 0.46) and post-weaning (adjacent = 2.99 kg/d, opposite = 2.87 kg/d; SE = 0.093; P = 0.42) periods. Adjacent treatment calves had greater water intakes during the milk-feeding (0.75 vs 0.55L/d; SE = 0.49; P = 0.005) and post-weaning (10.11 vs 9.30L/d; SE = 0.27; P = 0.04) periods, and tended to consume more water during weaning (2.55 vs 2.12L/d; SE = 0.16; P = 0.06). Greater intakes for the adjacent treatment calves may have contributed to a tendency for greater ADG (1.11 vs 1.05 kg/d; SE = 0.023; P = 0.08) during the milk-feeding period. Growth was similar between treatments for the weaning (0.83 vs 0.83 kg/d; SE = 0.04; P = 0.96) and post-weaning periods (1.22 vs 1.14 kg/d; SE = 0.06; P = 0.28). The results indicate that placement of solid feed close to the milk source encourages calves to increase their starter and water intake during the milk-feeding stage, which may contribute to greater growth during that period.

Key Words: dairy calf, feed location, growth