Effects of 30% dried distillers grains with solubles and 5% added fat prior to slaughter on growth performance, carcass characteristics, and economics of finishing pigs
Swine Day, 2014; Kansas Agricultural Experiment Station contribution; no. 15-155-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 1110; Finishing pig; Fiber; Fat; Yield
Two groups of pigs (n = 1,258, initially 233.2 lb; group 1 PIC 337 Ã— 1050; group 2 PIC 327 Ã— 1050) were used in a 20-d experiment to determine the effects of 30% dried distillers grains with solubles (DDGS) and 5% added fat prior to slaughter on growth performance, carcass characteristics, and economics of finishing pigs. There were a total of 20 replications per treatment. All pigs were fed a common diet with 30% DDGS until 20 d prior to slaughter, at which point they were weighed and allotted to dietary treatments. The dietary treatments were arranged in a 2 Ã— 2 factorial with 2 diet types, a corn-soybean mealâ€“based diet with or without 30% DDGS and added fat of 0 or 5% (group 1 = tallow; group 2 = choice white grease). Diets were formulated on a standardized ileal digestible (SID) lysine basis and balanced on an SID lysine to NE ratio. There were no treatment Ã— group interactions for any of the measured responses, so data for the two groups were combined for analysis. For the overall experiment, there was a tendency (P < 0.10) for a diet type Ã— added fat interaction for ADG; this interaction was significant (P < 0.05) for F/G and caloric efficiency on an ME and NE basis. These were the result of pigs fed the diet with 30% DDGS having greater ADG and F/G improvements when fat was included compared with those fed the corn-soybean mealâ€“based diet without DDGS. For the caloric efficiency interaction, pigs fed 30% DDGS had an improvement with added fat, whereas those fed the corn-soybean mealâ€“based diet with added fat had worse caloric efficiency than pigs fed the corn-soy diet without added fat. Although diet type did not affect final live weight, pigs fed the diet containing DDGS had reduced HCW (P < 0.05), which was the result of reduced carcass yield (P < 0.05). Adding 5% fat to the diet containing DDGS did not improve carcass yield. Jowl fat iodine value was increased by added fat (P < 0.05) and feeding DDGS (P < 0.05). For economics, there was a diet type Ã— added fat interaction (P < 0.05) for cost per pound of gain, which was the result of a larger increase in cost for pigs fed added fat in the corn-soybean mealâ€“based diet compared with the diet containing DDGS. Income over feed cost did not differ among dietary treatments. In conclusion, adding 5% fat to finishing pig diets containing 30% DDGS approximately 20 d prior to slaughter improved ADG and F/G but did not overcome the reduction in carcass yield from feeding DDGS.; Swine Day, Manhattan, KS, November 20, 2014
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Coble, Kyle F.; DeRouchey, Joel M.; Tokach, Michael D.; Goodband, Robert D.; Woodworth, Jason C.; and Dritz, Steven S.
"Effects of 30% dried distillers grains with solubles and 5% added fat prior to slaughter on growth performance, carcass characteristics, and economics of finishing pigs,"
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