Protein Quality of Triticale. II. Prediction of Protein Efficiency Indices Through Chemical Analyses1
- C. J. Knoblauch,
- F. C. Elliott and
- D. Penner2
Several chemical determinations of triticale (✕ Triticosecale Wittmack) meals have shown promise of predicting protein efficiency indices (PEI = g body weight gain per g protein consumed) as determined by Microtus bioassay. The percent water-soluble protein (pH 4.9), total trypsin units inhibited (total TUI, adjusted for percent water-soluble protein), and extracted dye-binding capacity (DBC completed after removal of water-soluble proteins) showed the highest correlations with PEI. A group of 42 F4 winter triticale plants representing seven F4 plants from each of two high F3 PEI plants, two average F3 PEI plants and two low F3 PEI plants, were analyzed. The correlations with PEI were −0.45, −0.53, and 0.66 (P<0.01) for percent water-soluble protein, total TUI, and extracted DBC, respectively. The multiple correlation coefficient utilizing total TUI and extracted DBC was 0.74**.
A group of 20 F3 plants selected for high and low PEI values gave even more predictable responses. Their correlations with PEI were −0.71, −0.79, and 0.66 for percent water-soluble protein, total TUI, and extracted DBC, respectively. The multiple correlation coefficient for the regression of extracted DBC and total TUI on PEI was 0.86**, indicating that 75% of the variation in PEI was accounted for by the two independent variables.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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