Abstract
The protein quality of two-component mixtures of meat-and-bone meal, bone meal, blood meal and feather meal was characterized by rat experiments (net protein utilisation (NPU)) and by chemical indices calculated from amino acid composition (limiting essential amino acid, sum of essential amino acids, chemical score (CS), essential amino acid index (EAA-index) and predicted value (PV)). Substitution of meat-and-bone meal for bone meal on a nitrogen basis reduced the NPU value. This was also indicated by amino acid indices. Substitution of meat-and-bone meal for blood meal on a nitrogen basis also reduced the NPU value; however, this was not indicated by the chemical indices. In the mixtures examined, feather meal complemented meat-and-bone meal as indicated by both the NPU value and chemical indices. A complementary effect was also found with the mixtures of feather meal and blood meal. A significant correlation was found between NPU value and either predicted value ( r=0.89), chemical score (0.83) or EAA-index (0.62), as calculated on cumulated data ( n=20).
Published Version
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