Effects of overprocessing on the nutritional quality of sunflower meal
1994
Zhang, Y. | Parsons, C.M.
A 2-wk chick study was conducted to evaluate the effect of overprocessing on the in vivo nutritional quality and in vitro protein solubility in .2% KOH of solvent-extracted sunflower meal (SFM) containing 36% protein. The SFM was autoclaved at 121 C and 105 kPa for 0, 30, 60, or 90 min in Experiment 1 and for 0, 10, 20,30,40, or 60 min in Experiment 2. Corn-SFM diets containing 22% protein were fed to chicks from 8 to 17 d of age. Chick performance decreased in both experiments as autoclaving time of the SFM increased. Linear regression analysis of performance on autoclaving time yielded the equations Y = 126.7 -.32X (r(2) = .94) for weight gain and Y = .615 - .001X (r(2) = .80) for feed efficiency in Experiment 1. A precision-fed cockerel digestibility assay using cecectomized birds indicated that true digestibility of amino acids in SFM decreased as autoclaving time increased. The effect of autoclaving on digestibility was greatest for Lys, wherein Lys digestibility in SFM was 86,54,43, and 35% when SFM was autoclaved for 0,30,60, or 90 min, respectively. Protein solubility of SFM in .2% KOH decreased from 64 to 51% as SFM was autoclaved from 0 to 60 min. The results indicated that protein solubility values of 60% or lower are indicative of overprocessing of SFM.
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