Protein Efficiency of Corn by-Products and Other Protein Feeds for Swine Growth

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Abstract
Semi-purified rations containing 11% of a single source protein were utilized in 3 expts. to evaluate the quality of the protein in corn oil meal, corn steep water solubles, soybean oil meal, tankage, and corn gluten meal. Dried whole egg and dried skim milk served as the source of protein in the control rations. Protein efficiency was expressed as lbs. gained per lb. of protein consumed. In the 1st expt. dried whole egg supported faster pig growth (1.19 lbs. vs. 0.98 lb. per day) and returned a higher protein efficiency (2.35 lbs. vs. 2.14 lbs.) than corn oil meal. Pigs receiving corn solubles lost wt. Dried skim milk supported the most rapid growth (1.44 lbs./ day) pig growth in the 2d expt. Corn oil meal (1.13 lbs /day) and soybean oil meal (1.16 lbs./day) were intermediate whereas equal parts corn solubles and soybean oil meal resulted in slow growth (0.66 lb./day). Protein efficiency in decreasing order for corn oil meal, dried skim milk, soybean oil meal, and the soybean oil meal-corn solubles mix, was 2.62, 2.42, 2.18 and 1.71, respectively. In the 3d expt., growth rate and protein efficiency was superior for skim milk, followed by corn oil meal, tankage, and corn gluten meal, in that order (1.57, 1.32, 0.87, and 0.59 lbs./day, respectively; 2.64, 2.51, 1.65, and 1.25 lbs. gain per lb. of protein, respectively).