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The utilization of lysine by young pigs from nine protein concentrates compared with free lysine in young pigs fed ad
1Department of Animal Husbandry, University of Sydney, Camden, New South Wales, Australia.
Abstract:
1. Pigs (n 195) between 21 and 49 d of age were given a basal diet containing wheat, wheat gluten and cotton-seed meal which was supplemented with one of nine protein concentrates or free L-lysine. The diets were given ad lib. in two experiments. 2. Increasing the lysine content of the diets from 6.9 to 10.1 g/kg increased the weight gains of the pigs from 89 to 317 g/d in the first experiment. In the second experiment the weight gains were increased from 68 to 213 g/d by increasing the lysine content of the diets from 5.9 to 9.5 g/kg. 3. The utilization of lysine from the protein concentrates was compared with the utilization of free L-lysine. 4. The utilization of lysine fro weight gain compared with free lysine was 0.86-0.88 for meat meals, 0.95-0.99 for soya-bean meal, 0.69-0.75 for cotton-seed meal, 0.90 for lupins (Lupinus augustifolius) and 0.99 for milk.