Amino acid requirements of South African Mutton Merino lambs 3. Duodenal and whole empty body essential amino acid profile
CITATION: Ferreira, A. V., Van Der Merwe, H. J. & Loest, C. A. 1999. Amino acid requirements of South African Mutton Merino lambs 3. Duodenal and whole empty body essential amino acid profile. South African Journal of Animal Sciences, 29(1):40-47.
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The duodenal and whole empty body essential amino acid (EAA) profile of South African Mutton Merino lambs fed a standard growth diet was investigated. The data of 20 lambs were used. With the exception of phenylalanine, significant (p < 0.05) differences between the EAA concentrations of the duodenal digesta and whole empty body occurred. From the chemical score, it was concluded that the duodenal digesta was first-limiting in histidine and second-limiting in methionine, followed by threonine and arginine for the whole empty body growth of South African Mutton Merino ram lambs fed a standard diet high in rumen degradable protein. A calculated essential amino acid composition for the correction of imbalances in duodenal digesta was as follows (%): 11.21 arginine; 14.53 histidine; 8.17 isoleucine; 9.97 leucine; 8.64 lysine; 13.87 methionine; 9.97 phenylalanine; 12.54 threonine and 11.11 valine.