Digestibility of Liquid Whey by Steers and Cows

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Abstract
In 2 reversal experiments to determine digestibility of liquid acid whey by steers and cows, trials within each experiment consisted of an adjustment period followed by 10 day preliminary and 7 day collection periods. In Experiment 1 4 Jersey steers received a daily basal diet of 7000 g of hay plus 800 g of soybean meal. Two of the steers received 45.4 kg whey in addition to the basal diet within each trial. In Experiment 2 four mature, dry, nonpregnant cows (3 Jersey and 1 Ayrshire) were offered 9000 g of hay plus 300 g of soybean meal daily. Two of the cows received 45.4 kg whey in addition to the basal diet within each trial. Digestion coefficients of the basal and basal-plus-whey diets were determined directly, and digestibility of whey alone was determined by the difference of the 2 diets. Liquid acid whey had an average digestibility of dry matter of 82.6%, of protein 68.8% and of organic matter, 84.2%.

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