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- Title
Effects of xylanase and wheat middlings in diets for finishing pigs.
- Authors
Feoli, C.; Hancock, J. D.; Monge, C. R.; Jones, C. L.; Starkey, C. W.
- Abstract
A total of 312 finishing pigs (avg initial BW of 64.5 kg) was used in a 62-d experiment to determine the effects of xylanase and wheat middlings on growth performance and carcass characteristics. Treatments were a corn-soybean meal-based diet without and with 826 mg/kg xylanase product (to supply none and 2,313 units of xylanase activity per kg of diet) and wheat middlings (none, 15%, and 30%) arranged as a 2 x 3 factorial. The pigs were sorted by sex and ancestry and blocked by BW with 13 pigs/pen and four pens/treatment. Feed and water were consumed on an ad libitum basis until the pigs were killed (avg BW of 121 kg) at a commercial slaughter facility. Overall, there were no interactions among xylanase addition and concentration of wheat middlings for ADG, ADFI, G:F, dressing percentage, last-rib backfat thickness, or percentage carcass lean (P > 0.26). As for the main effects, addition of xylanase did not change overall growth performance or carcass measurements (P > 0.16). As concentration of wheat middlings was increased from none to 30%, there were linear decreases in overall ADG (P < 0.003), G:F (P < 0.002), dressing percentage (P < 0.002), and last-rib backfat thickness (P < 0.06) while percentage carcass lean increased (P < 0.03). However, the effects on carcass fatness and lean percentage disappeared (P > 0.71) when hot carcass weight was used as a covariate. In conclusion, increasing the concentration of wheat middlings in diets for finishing pigs reduced rate and efficiency of gain and addition of xylanase did not prevent these effects.
- Subjects
SWINE; WHEAT; XYLANASES; ANIMAL nutrition; BIOLOGICAL dressings; ANIMAL carcasses; EMPLOYEE reviews; OBESITY
- Publication
Journal of Animal Science, 2006, Vol 84, p429
- ISSN
0021-8812
- Publication type
Article