Soybean Protein Substitute for Milk Protein in Milk Replacers for Suckling Calves

Eight experiments evaluated soy protein concentrate (60 to 65%) and toasted soybean meal (44 to 48%) as protein sources in milk replacers when fed alone or with concentrates and hay. In the soy milk replacers soy protein contributed 50 to 88% of the total protein. All-milk protein replacers served as control. Israeli-Friesian calves (]38) were started on the experimental diets when 3 to 4, 7 to 10, or 30 days old; each experiment lasted 42 days.