Apparent digestibility of AA-N in the small intestine of dairy cows fed eight different diets varied between 0.61 and 0.75. As level of intake was increased a significant decrease in digestibility of AA-N was observed. Treating soyabean meal and cotton seed cakes with 0.5% formaldehyde reduced digestibility significantly.
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T. Hvelplund (1984) studied this question.
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