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This Article Full Text (PDF) All Versions of this Article: jas.2007-0472v1 86/12/3450    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Nortey, T. N. Articles by Zijlstra, R. T. Search for Related Content PubMed PubMed Citation Articles by Nortey, T. N. Articles by Zijlstra, R. T.

Effects of xylanase supplementation on the apparent digestibility and digestible content of energy, amino acids, phosphorus, and calcium in wheat and wheat by-products from dry milling fed to grower pigs

T. N. Nortey^*,,¶, J. F. Patience^*, J. S. Sands, N. L. Trottier and R. T. Zijlstra^¶

^* Prairie Swine Centre Inc., Saskatoon, Saskatchewan, Canada, S7H 5N9 , Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 5A8 , Danisco Animal Nutrition, Marlborough, UK, SN8 1AA , Department of Animal Science, Michigan State University, East Lansing, MI 48824 ^¶ Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada, T6G 2P5

ruurd.zijlstra{at}ualberta.ca

Abstract

Wheat by-products are feedstuffs that vary in nutritional value, partly due to arabinoxylans that limit nutrient digestibility. Millrun is a by-product from dry milling wheat into flour and contains varying amounts of the bran, middlings, screening, and shorts fractions. The digestible nutrient content of millrun is not well known. Effects of xylanase supplementation (0 or 4,000 units/kg diet) on energy, AA, P, and Ca digestibility were studied in a wheat control diet and 5 diets containing 30% of a by-product (millrun, middlings, shorts, screening, or bran) in a 2 x 6 factorial arrangement of treatments. The wheat control diet was formulated to contain 3.34 Mcal DE/kg and 3.0 g standardized ileal digestible Lys/Mcal DE. Diets contained 0.4% chromic oxide. Each of 12 ileal-cannulated pigs (32.5 ± 2.5 kg) was fed 6 or 7 of 12 diets at 3 times the DE requirement for maintenance in successive 10-d periods for 6 or 7 observations per diet. Feces and ileal digesta were each collected for 2 d. Xylanase tended to increase (P < 0.10) ileal energy digestibility 2.2%-unit and the DE content 0.10 Mcal/kg DM and increased (P < 0.05) ileal DM digestibility 2.8%-unit; a diet by xylanase interaction was not observed. Xylanase increased (P < 0.05) total tract energy and DM digestibility and the DE content. A diet by xylanase interaction was observed; xylanase increased (P < 0.05) total tract energy digestibility of the millrun diet from 72.1 to 78.9%, DE content from 3.19 to 3.51 Mcal/kg DM, and DM digestibility from 71.5 to 78.6%. Diet affected (P < 0.05) and xylanase improved (P < 0.05) digestibility and digestible contents of some AA in diets and by-products, including Lys, Thr, and Val. Xylanase increased (P < 0.05) Lys digestibility by 13.8, 5.0, 5.2, 6.0, and 14.1%-units in millrun, middlings, shorts, screening, and bran, respectively. Diet affected (P < 0.01) total tract P and Ca digestibility. Xylanase increased (P < 0.05) digestible P and Ca content. In summary, nutrient digestibility varies among wheat by-products. Millrun contained 2.65 Mcal DE/kg DM, which xylanase increased to 3.56 Mcal DE/kg DM. Xylanase improved nutrient digestibility and DE content in wheat by-products; and the extent of improvement depended on the by-product. Xylanase supplementation may maximize opportunities to include wheat by-products in swine diets and ameliorate reductions in nutrient digestibility that may be associated with arabinoxylans.

Key Words: by-product • digestibility • energy • pig • wheat • xylanase