V Tariability of amino acid digestibility of locally produced soya oilcake
he principal source of protein used in monogastric feed in South Africa and other world areas is soybean meal (SBM). In recent years, the source of SBM used in the SA feed industry has shifted from imported SBM to locally grown beans and processed SBM. The majority of nutritionists make regular changes to crude protein levels of SBM with digestible amino acids values being derived from the crude protein levels; very few however make any adjustments to the digestibility values of crude protein and individual amino acids. The nutrient values and quality of the protein fraction of SBM depends on numerous factors, including processing conditions, soil characteristics and growing methods, as well as the origin of the beans.
Anti-nutritional factors present in SBM
Several anti-nutritional factors, including trypsin inhibitors, are present in raw soybeans. As some of these