The influence of graded equimolar additions of DL-methionine and DL-methionine hydroxy analogue-free acid to a wheat-soybean diet deficient in methionine was determined under commercial conditions with straight-run broiler chicks from 1 to 33 d of age. The graded addition of DL-methionine and DL-methionine hydroxy analogue-free acid caused a statistically significant increase in all observed parameters. Within the dosage levels, no statistically significant differences between the methionine products were observed.
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Daenner et al. (2003) studied this question.
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