Batterham et al. (1993) found that ileal digestibility may not always provide a good estimate of methionine bioavailability, especially for protein supplements that have been heat processed. The proportion of apparent ileal digestible methionine retained by pigs differed among different protein sources. The proportions were 39% for cottonseed meal, 45% for meat and bone meal, and 47% for soybean meal. The authors concluded that in 'heat-processed meals a considerable proportion of the methionine is absorbed in a form(s) that is (are) inefficiently utilized'.
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