Lysine has been shown to increase gain and feed efficiency when added to a ration of sorghum grain and cottonseed meal for growing-fattening pigs. Supplementing the rations with lysine increased feed consumption. Supplementation with 0.3% lysine markedly increased growth and improved feed efficiency in both experiments. Amounts of lysine above 0.3% gave only small increments of growth rate.
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Hale et al. (1961) studied this question.
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