Animal Science Abstract
Effects of xylanase and antibiotic addition on ileal and faecal apparent digestibilities of dietary nutrients and evaluating HCl-insoluble ash as a dietary marker in growing pigs
Y.-L. Yin1,A, J. D. McEvoy2, H. Schulze3,B and K. J. McCracken4,5
APresent address: Department of Animal and Poultry Science, University of Guelph, Ontario, Guelph, N1G 2W1 Canada.
BPresent address: Provimi, BV, Rotterdam, The Netherland
2Veterinary Science Division, Department of Agriculture for Northern Ireland, Stony Road, Belfast BT4 3SD, UK
3Finnfeeds International Ltd, Marlborough SN8 1AA, UK
4Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX, UK
5Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK
Abstract
The effects of xylanase and antibiotic addition to the diet, and the use of HCl-insoluble ash as a marker, on ileal and faecal apparent digestibilities of nutrients were studied with 12 growing pigs fitted with post-valvular T-caecum cannulae (PVTC). The results showed that the apparent ileal digestibility of non-starch polysaccharide (NSP) was high, (over 0·30). Xylanase, or antibiotics (Avoparcin) or xylanase plus antibiotics supplementation of the wheat middling-based diets did not significantly (P > 0·05) increase the ileal and faecal apparent digestibilities of NSP, neutral-detergent fibre (NDF), dry matter, crude protein, energy or amino acids. There were no significant (P > 0·05) differences between the HCl-insoluble ash and Cr2O3 recoveries at the ileal or at the faecal levels: proportionately, 0·864 and 0·911 for the ileal and faecal recoveries of HCl-insoluble ash, and 0·857 and 0·915 for the ileal and faecal recoveries of Cr2O3, respectively.
Keywords: antibiotics, digestibility, enzymes, markers, pigs
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