Amino acids profile of rumen-undegradable protein
of maize, rice bran, soyabean meal and rapeseed
meal in steers

C. Y. Xie; H. J. Yang; Q. Yue; X. B. Yao; J. Q. Wang

doi:10.22358/jafs/74497/2007

Suppl. 2/2007 vol. 16

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Amino acids profile of rumen-undegradable protein of maize, rice bran, soyabean meal and rapeseed meal in steers

C. Y. Xie ¹

H. J. Yang ^1,2

Q. Yue ¹

X. B. Yao ¹

J. Q. Wang ²

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Department of Animal Biology and Physiology, College of Biological Sciences, China Agricultural University, Beijing 100094, P.R. China

State Key Laboratory of Animal Nutrition, Institute of Animal Science, China Academy of Agricultural Sciences, Beijing 100094, P.R. China

Publication date: 2007-09-17

Corresponding author

H. J. Yang

Department of Animal Biology and Physiology, College of Biological Sciences, China Agricultural University, Beijing 100094, P.R. China

J. Anim. Feed Sci. 2007;16(Suppl. 2):235-240

DOI: https://doi.org/10.22358/jafs/74497/2007

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ABSTRACT

Maize, rice bran, soyabean meal and rapeseed meal were used to explore the effects of ruminal incubation on the amino acids profile of rumen-undegradable protein (RUP) in steers. Except maize, the disappearances of total amino acids (TAAs) and CP in feeds changed dramatically during former 24 h (P<0.05), and some slight differences were found in the following 24 h (P>0.05). Arginine and histidine were more sensitive to microbial degradation, but branch-chain AAs (isoleucine, leucine and phenylalanine) were more resistant. Microbial contamination should be taken into account to compare degradation rate of individual AA especially for branch-chain AAs in future research.

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