Abstract
An attempt was made to improve the digestibility of soy proteins (promine D) in milk replacers for young calves by supplementing the diets with pepsin and/or pancreatin preparations. Calves fed the basal soy milk replacer from 3 to 31 days of age had an average gain of 0.198 kg/day; those fed a skim powder control gained 0.443 kg/day. Supplementation of the basal soy milk replacer with 0.5% (of dry matter (DM)) pancreatin or 0.5% pepsin, or both treatments together, had a detrimental effect on calf performance, reducing gains to 0.106, 0.034 and −0.049 kg/day, respectively. Supplementation of soy replacer with these enzymes, separately or together, also reduced apparent digestibility of DM, N and lipid but had no effect on feed intakes.
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