Abstract
In previous research, feeding pigs high amounts of dried distillers grains with solubles (DDGS) and wheat middlings (midds) has been shown to reduce carcass yield and negatively affect iodine value (IV). The influence of Ractopamine HCl (RAC; Paylean, Elanco Animal Health, Greenfield, IN) on this response is not known; therefore, a total of 575 finishing pigs (PIC 327 × 1050, initially 123 lb) were used in two consecutive 73-d trials to determine the effects of DDGS and midds (high fiber) withdrawal 24 d before harvest in diets with or without RAC on finishing pig growth performance, carcass characteristics, and fat quality. From d 0 to 49, pigs were allotted to 1 of 2 dietary treatments in a completely randomized design based on initial pen weight. The dietary treatments included a corn-soybean meal–based control diet or diets with 30% DDGS and 19% wheat midds. Twelve pens of pigs were fed the corn-soybean meal control diet, and 24 pens were fed the high-fiber diet. During this 49 d period, pigs fed the corn-soybean meal diets had improved (P < 0.0001) ADG and F/G compared with those fed the high-fiber diets. On d 49, pens of pigs were re-allotted to 1 of 6 dietary treatments; pigs remained on the corn-soybean meal diets, switched from the high-fiber diet to corn-soybean meal (withdrawal diet), or were maintained on the high-fiber diet. These 3 regimens were fed with or without 9 g/ton RAC.; Swine Day, Manhattan, KS, November 15, 2012
Highlights
The influence of Ractopamine HCl (RAC; Paylean, Elanco Animal Health, Greenfield, IN) on this response is not known; a total of 575 finishing pigs (PIC 327 × 1050, initially 123 lb) were used in two consecutive 73-d trials to determine the effects of dried distillers grains with solubles (DDGS) and midds withdrawal 24 d before harvest in diets with or without RAC on finishing pig growth performance, carcass characteristics, and fat quality
By-product ingredients such as dried distillers grains with solubles (DDGS) and wheat middlings are common feed ingredients used in diet formulation
The objective of this study was to determine the effects of RAC on growth performance, carcass characteristics, carcass fat quality, and intestinal weights of pigs withdrawn from the high-fiber diets before market vs. pigs fed cornsoybean meal based diets or high-fiber diets containing DDGS and midds
Summary
By-product ingredients such as dried distillers grains with solubles (DDGS) and wheat middlings are common feed ingredients used in diet formulation. A major concern with feeding a high amount of DDGS is soft carcass fat (high iodine value) and both DDGS and midds have been shown to reduce carcass yield. Complete withdrawal of DDGS and wheat midds before marketing has been successful in lowering the iodine value (IV) and improving carcass yield.[3]. A feed additive that improves carcass yield is Ractopamine HCl (RAC; Paylean, Elanco Animal Health, Greenfield, IN). The objective of this study was to determine the effects of RAC on growth performance, carcass characteristics, carcass fat quality, and intestinal weights of pigs withdrawn from the high-fiber diets before market vs pigs fed cornsoybean meal based diets or high-fiber diets containing DDGS and midds
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