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Short Communication: Effect of Temporary Glycosuria on Molasses Consumption in Holstein Calves

C. S. Wilcox^*, M. M. Schutz^*, S. S. Donkin^*, D. C. Lay, Jr. and S. D. Eicher^,1

^* Department of Animal Sciences, Purdue University, West Lafayette, IN 47907
Livestock Behavior Research Unit, USDA-ARS, West Lafayette, IN 47907

¹ Corresponding author: Susan.Eicher{at}ars.usda.gov

This study was conducted to determine the effect of experimentally increased glucose demand on voluntary consumption of molasses by dairy calves. Three-week-old calves received 0.365 g of phlorizin by s.c. injection. Urinary output and molasses consumption were measured hourly, and urinary glucose concentration was screened. Molasses consumption for the 24 h after treatment was (mean ± SE) 72.0 g (±7) for the control group and 142 g (±1) for the phlorizin-treated group. Urinary output for the 8-h test period was 1.13 kg for the control group and 1.67 kg for the phlorizin-treated calves. Mean urinary glucose peaked at 10 g/L by 4 h after treatment for calves given phlorizin, whereas the concentration for the control group remained close to 0 g/L. Phlorizin treatment increased voluntary consumption of molasses in 3-wk-old Holstein calves.

Key Words: dairy calves • glycosuria • molasses • phlorizin