Growth Performance, Carcass Characteristics, and Economics of Pigs Fed Diets Containing a Corn Germ-Corn Bran Product
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Due to an increased number of corn milling plants in Nebraska, it is necessary to evaluate the use of corn by-products in swine diets. In these experiments, the inclusion of a corn germ-corm bran product into swine diets was evaluated for its effects on growth performance, carcass composition, carcass quality traits, and economic value. In Experiment 1, individually housed growing-finishing pigs were fed: 1)corn-soybean, 2) corn-soybean meal-4% bleachable tallow, or 3) corn-soybean meal-8% corn germ-bran diets. During the 93-day trial there were no differences for average daily gain (ADG; P>0.10) or average daily feed intake (ADFI; P>0.10) among treatments. The numerical improvements of ADG and ADFI when pigs were fed the diet containing tallow resulted in a 9% improvement in feed efficiency (ADFI/ADG; P<0.001). Fat-O-Meter data suggested that pigs fed the diet containing tallow were leaner than pigs fed the corn-soybean meal diet (P<0.01). Treatments imposed upon group-housed growing-finishing pigs in Experiment 2 were: 1)corn-soybean meal, 2)corn-soybean meal-4% bleachable tallow, 3)corn-soybean meal-8% corn germ-bran, and 4) corn-soybean meal-16% corn germ-bran. During the 102-day trial there were no differences among treatments for ADG (P>0.10). Pigs fed the diet containing tallow had a 5.3% reduction in ADFI (P<0.007) and 8.7% improvement in feed efficiency (ADFI/ADG: P<0.005)compared to all other treatments. Ultrasound scans revealed no differences (P>0.10) in longissimus muscle area among treatments and an increased (P<0.02) backfat depth for pigs fed the 4% tallow diet compared to other treatments. Calculated (NPPC, 1991) carcass lean content of pigs fed the 4% tallow diet was less than (P<0.06) the other treatments. Dressing percentage was greater (P<0.05) for pigs fed diets containing tallow compared to pigs fed diets containing corn germ-bran. In general, longissimus muscle quality was improved for pigs fed a control (corn-soybean meal) diet versus other treatments; however, all treatment means were within acceptable ranges for muscle quality traits. Depending on the corn price (we used values between $1.75 and $3.00/bu) and market price for market hogs (we used values between $10 and $50/cwt live), the value of corn germ-corn bran in growing-finishing diets ranges between $0 and $104 per ton.
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