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Asian-Australas J Anim Sci > Accepted
doi: https://doi.org/10.5713/ajas.16.0894    [Accepted]
Dose-dependent effects of a microbial phytase on phosphorus digestibility of common feedstuffs in pigs
Ferdinando N. Almeida*, Mercedes Vazquez-Anon, Jeffery Escobar1
Novus International, Inc., St Charles, United States
1Elanco Animal Health, Greenfield, United States
* Corresponding Author: Ferdinando N. Almeida ,Tel: 6369267426, Fax: 6369267426, Email: ferdinando.almeida@novusint.com
Received: November 22, 2016;  Revised: December 7, 2016.  Accepted: January 6, 2017.  Published online January 13, 2017.

To evaluate concentrations of a microbial phytase (Cibenza® Phytaverse®, Novus International, USA) on standardized total tract digestibility (STTD) of P in canola meal (CM), corn, corn-derived distiller's dried grains with solubles (DDGS), rice bran (RB), sorghum, soybean meal (SBM), sunflower meal (SFM), and wheat.
Two cohorts of 36 pigs each (initial BW = 78.5 ± 3.7 kg) were randomly assigned to 2 rooms, each housing 36 pigs, and then allotted to 6 diets with 6 replicates per diet in a randomized complete block design. Test ingredient was the only dietary source of P and diets contained 6 concentrations of phytase (0, 125, 250, 500, 1,000, or 2,000 FTU/kg) with 0.4% of TiO2 as a digestibility marker. Feeding schedule for each ingredient was 5 d acclimation, 5 d fecal collection, and 4 d washout.
The STTD of P increased (linear or exponential p ≤ 0.001) with the inclusion of phytase for all ingredients. Basal STTD of P was 37.6% for CM, 37.6% for corn, 68.6% for DDGS, 10.3% for RB, 41.2% for sorghum, 36.7% for SBM, 26.2% for SFM, and 55.1% for wheat. The phytase concentration (FTU/kg) needed for highest STTD of P (%), respectively, was 735 for 64.3% in CM, 550 for 69.4% in corn, 160 for 55.5% in SBM, 1,219 for 57.8% in SFM, and 881 for 64.0% in wheat.
Variations in enzyme efficacy to release P from phytate in various feedstuffs need to be taken into consideration when determining the matrix value for phytase in a mixed diet, which likely depends on the type and inclusion concentration of ingredients used in mixed diets for pigs. The use of a fixed P matrix value across different diet types for a given phytase concentration is discouraged as it may result in inaccurate diet formulation.
Keywords: Digestibility; Ingredient; Pig; Phosphorus; Phytase
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