The effect of wheat phosphorus content and supplemental enzymes on digestibility and growth performance of weaner pigs
Kim, J.C., Simmins, P.H., Mullan, B.P. and Pluske, J.R. (2005) The effect of wheat phosphorus content and supplemental enzymes on digestibility and growth performance of weaner pigs. Animal Feed Science and Technology, 118 (1-2). pp. 139-152.
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A 2 × 4 factorial experiment was conducted with the respective factors being wheat phosphorus (P) content (low-P variety: 2.52 g/kg DM, and high-P variety: 3.76 g/kg DM) and enzyme supplementation (no enzyme, xylanase, phytase, and xylanase plus phytase). The enzymes were xylanase (Porzyme ® 9300, minimum activity 4000 U/g endo-1,4-β-xylanase) and phytase (Phyzyme™ XP, activity 4100 U/g phytase). Eighty male weaner pigs (Landrace × Large White, 5.4 ± 0.07 kg) were fed an identical pre-trial diet for 1 week and then received their respective experimental diet for 3 weeks. All diets contained 610 g wheat/kg and similar concentrations of calculated digestible energy (14.2 MJ/kg), available lysine (0.78 g/MJ DE), available P (3.2 g/kg) and Ca:P (1.46:1). Collection of faeces was made for three consecutive days from day 14 for determination of digestibility, using titanium dioxide as an indigestible marker. The main effect of wheat P content on the coefficient of total tract apparent digestibility (CTTAD) of DM, CP, energy, P and Ca was not significant (P > 0.05). Enzyme supplementation, as a main effect, influenced the CTTAD of DM (P < 0.01) and energy (P < 0.01), such that xylanase plus phytase decreased their CTTAD. Xylanase plus phytase improved the CTTAD of P and Ca in the high-P wheat variety diet but not in the low-P wheat variety diet (interaction P < 0.001 and P < 0.05, respectively). For performance, significant improvements (P < 0.05) were only seen in week 1 of the feeding trial. In summary, the wheats used in this study responded differently to xylanase and phytase, and a synergistic effect of xylanase plus phytase supplementation was not significant for either digestibility or pig performance.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Veterinary and Biomedical Sciences|
|Copyright:||© 2004 Elsevier B.V.|
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