Submitted to: Midwestern Section of the American Society of Animal Science
Publication Type: Abstract only
Publication Acceptance Date: 3/21/2012
Publication Date: 3/21/2012
Citation: Song, R., Chen, C., Johnston, L., Kerr, B.J., Weber, T.E., Shurson, G. 2012. Effects of feeding diets containing highly oxidized dried distillers grains with solubles (DDGS) with increasing vitamin E levels to wean-finish pigs on growth performance, carcass composition, and pork fat quality [abstract]. Midwestern Section of the American Society of Animal Science. Journal of Animal Science 90 (Suppl. 2):64. Interpretive Summary:
Technical Abstract: Lipid peroxidation in animal feed has been shown to negatively impact growth performance and meat quality. A total of 432 weanling pigs were used to evaluate the effects of feeding highly oxidized DDGS with 3 levels of vitamin E on growth performance, carcass composition, and pork fat quality. The DDGS source used in this study was 2X higher in thiobarbituric acid reactive substances (TBARS, 5.2 vs. 1.8 ng/mg oil) and 6X higher in peroxide value (PV, 84.1 vs. 11.5 meq/kg oil) than the averages from 30 other sources, and 25X higher in TBARS and 27X higher in PV than a reference sample of corn. Pens within blocks were randomly assigned to one of 6 dietary treatments in a 2 x 3 factorial design. Pigs were fed corn-soybean meal (CON) or 30% DDGS diets with 3 levels of vitamin E (alpha-tocopheryl acetate): none supplemented (No-E), NRC level (1X-E), or 10X NRC level (10X-E). Compared to CON, inclusion of 30% DDGS in diets reduced (P < 0.001) final BW (110 vs. 107 kg), overall ADG (0.76 vs. 0.74 kg/d) and G:F. Overall ADFI tended to decrease (P = 0.10) and G:F increased (P = 0.03) when dietary vitamin E level increased. Hot carcass weight, dressing percentage, backfat depth and loin eye area were reduced (P < 0.01) in pigs fed DDGS compared to CON, but percentage of fat-free carcass lean was not affected. Feeding DDGS increased (P < 0.001) PUFA concentration, particularly linoleic acid (P < 0.001), and iodine value (P < 0.001) in belly fat and backfat compared to pigs fed CON. Vitamin E level in LM was higher (P < 0.001) in 10X-E than No-E or 1X-E dietary treatments. Compared to CON, pigs fed DDGS showed increased vitamin E level in LM when fed No-E (1.0 vs. 3.1 µg/g, P = 0.005), but not when fed 1X-E or 10X-E. These results indicate that feeding highly oxidized, 30% DDGS diets to wean-finish pigs may negatively affect growth performance and dressing percentage, and supplementation of additional vitamin E in the diet did not counteract these effects, but did improve G:F and vitamin E level in LM.