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Protein Quality of Triticale. II. Prediction of Protein Efficiency Indices Through Chemical Analyses¹

Several chemical determinations of triticale (x 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.

Key Words: Trypsin inhibitor • Dye-binding capacity • Vole bioassays • X Triticosecale Wittmack • Microtus pennsylvanicus

² Former graduate research assistant (presently research associate, Univ. of Guelph, Guelph, Ontario, Canada), professors, Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, M1 48824.

Received for publication June 30, 1975.