Influence of phytase and carbohydrase enzymes on apparent ileal nutrient and standardized ileal amino acid digestibility in growing pigs fed wheat and barley-based diets

    Effects of phytase with or without carbohydrases on utilization of nutrients other than P are not well understood in diets adequate in P. Thus, we investigated the effects of Phyzyme XP« (PX) and carbohydrase enzymes (Porzyme«: xylanase and Ô-glucanase, C) on coefficients of ileal nutrient digestibility (CAID) in growing pigs fed wheat/barley-based diets. The diets were: 1) basal (B, 8% less DE than NRC, 1998, with no enzymes), 2) B+PX, 3) B+PX+50 g C/MT (B+PX+50C) and 4) B+PX+100 g C/MT (B+PX+100C). The PX was added at 100 g/MT to all phytase containing feed, and C was added at 50 and 100 g/MT to diets 3 and 4, respectively. Acid insoluble ash was used as an indigestible marker. Diets were fed to 4 barrows (BW 35.9▒1.4 kg) fitted with a Tcannula at the distal ileum, according to a 4Î4 Latin square design. Experimental periods lasted 7 d and ileal digesta were collected in 12-h periods on d-6 and d-7. At the end of the 4-wk period, pigs were fed a 5% casein diet to estimate basal endogenous AA losses. Data were subjected to pre-planned contrasts. Overall, diets containing PX had higher (Pb0.05) CAID of energy (0.60 vs. 0.58), AA (0.72 vs. 0.69) and phytate (0.56 vs. 0.33) compared with the B diet. When corrected for basal endogenous losses, PX-containing diets had higher (Pb0.05) coefficients of standardized ileal digestibility (CSID) of Met and Thr than the B diet. In the presence of PX, the highest response to C for CAID of energy (0.59 vs. 0.62) was achieved at 50 g/MT, the AID of DM and energy increased (Pb0.05) by 7.2 and 7.0%, respectively, with 50 g/MT of C compared to B diet. In conclusion, phytase and carbohydrase combined increased CAID of energy, and that PX-containing diets not only increased CAID of AA but resulted in lower diet-specific endogenous losses in a practical diet.
    Document information
    Product / service: Carbohydrases and Proteases
    Publication date: 01/01/2010
    Authors: Kiarie E, Owusu-Asiedu A, Simmins PH, Nyachoti CM
    Doctype: Publications & Citations
    Publication / conference: Livestock Science, volume 134
    Regions and countries: Global
    Keywords: amino, acid, digestibility, ash, barley, based, diet, barrows, basal, endogenous, losses, bw, carbohydrase, carbohydrases, casein, de, diets, digesta, digestibilities, dm, e, effects, loss, energy, enzyme, enzymes, feed, growing, pig, pigs, ileal, ileum, insoluble, marker, nutrient, nutrients, p, phytase, phytate, response, utilization, wheat, xylanase
    Production challenge(s): Gut health
    Diets: Wheat, rye & triticale, Wheat, rye and tricale containing by-products
    Brands: Axtra® AB, Porzyme® 9300, Porcheck, Danisco Xylanase
    Resource ref: 11349
    This material is related to a conference
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