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Utilization of Fababean Protein Concentrate in Milk Substitute Diets by Preruminant Calves

University of Manitoba, Winnipeg, Manitoba R3T 2N2

ABSTRACT

Twenty-four Holstein calves, 3 days of age, were assigned randomly to milk replacers in which 80, 50, 25, and 0% of the total protein was supplied by fababean protein concentrate. The remainder of the protein was supplied by skim milk powder and whey. All diets were made to equal milk in methionine content. Liquid diets were offered in equal amounts twice daily such that each calf received 9 g crude protein/kg body weight^.75 per day. Mixed with water, these diets remained in suspension and were palatable. Growth rates of calves were similar for diets although calves fed diets containing greater proportions of fababean protein concentrate had reduced feed efficiencies. Digestibility coefficients for dry matter, crude fat, and crude protein improved with age of the calf. Diet did not influence digestibility coefficients of dry matter and crude fat which were 81.7, 79.9, 84.5, and 85.3% and 69.0, 71.7, 79.1, and 79.4% for the respective diets. The digestibility coefficient of crude protein was influenced by diet, digestibility improving as the portion of protein supplied by skim milk and whey increased. The crude protein digestibility of fababean protein concentrate by regression analysis was 56.8, 65.1, and 79.9% for calves aged 8 to 13, 15 to 20, and 22 to 27 days.