Abstract
Amino acid (AA)-to-crude protein (CP) ratios in soybean meal (SBM) may be different for different sources of SBM depending on the presence of additional hulls. Therefore, this study was conducted to develop novel two-slope equations to predict the concentrations of AAs in SBM using CP as an independent variable. Regression analyses were performed with each AA in SBM as the dependent variable and the CP as the independent variable. Among all AAs, the predicted Lys in SBM (% dry matter (DM)) was: Lys = 3.19 − 0.026 × (51.88 − CP) where CP < 51.88% DM and Lys = 3.19 + 0.072 × (CP − 51.88) where CP > 51.88% DM with R2 = 0.51 and p < 0.001. In conclusion, the novel equations provided reasonable estimates of the AA concentrations from different ranges of CP in SBM.
Highlights
Soybean meal (SBM) is a byproduct of extracting oil from soybeans and this defatted meal is one of the amino acid (AA) sources for livestock and poultry
Concentrations of AAs and crude protein (CP) in SBM have positive linear correlations [5], but the magnitude of AA concentration changes resulting from CP deviation varies depending on the presence of soybean hulls in SBM, due to the different AA-to-CP ratios between soybean hulls and SBM
We developed novel two-slope equations to predict the AA concentrations from CP in SBM
Summary
Soybean meal (SBM) is a byproduct of extracting oil from soybeans and this defatted meal is one of the amino acid (AA) sources for livestock and poultry. Soybean hulls with an average of 10.27% CP on a DM basis [1] (IFN 1-04-560) are often added to SBM at the end of SBM production, resulting in the dilution of AAs in SBM due to the relatively low AA contents in soybean hulls. The influence of soybean hull inclusion in SBM products on the AA concentrations is not reflected in the simple linear equations [3,4]. To bridge this gap, we developed novel two-slope equations to predict the AA concentrations from CP in SBM
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