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Plasma amino acid patterns were studied in sheep receiving varying amounts of DL- or L-methionine (0'6-10·0 g/day) or L-cystine (2·0 and 8·0 g/day) as abomasal supplements or DL-methionine (10 g/day) as a dietary supplement.
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Reis et al. (1973) studied this question.
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