Determining the Phosphorus Release of GraINzyme Phytase in Nursery Pigs

Authors

Larissa L. Becker, Kansas State UniversityFollow
Madie R. Wensley, Kansas State UniversityFollow
Joel M. DeRouchey, Kansas State UniversityFollow
Jason C. Woodworth, Kansas State UniversityFollow
Mike D. Tokach, Kansas State UniversityFollow
Robert D. Goodband, Kansas State UniversityFollow
Jordan T. Gebhardt, Kansas State UniversityFollow
R. Michael Raab, Agrivida, Inc., Woburn, MA
Philip A. Lessard, Agrivida, Inc., Woburn, MA

Keywords

bone ash, nursery pigs, phosphorus, phytase

Abstract

A total of 360 pigs (200 × 400, DNA; initially 21.9 ± 0.42 lb) were used in a 21-d growth trial to determine the available P (aP) release curve for GraINzyme Phytase (Agrivida Inc., Woburn, MA). Pigs were weaned at approximately 21 d of age, randomly allotted to pens based on initial BW and fed common starter diets. From d 18 to 21 post-weaning, all pigs were fed a diet containing 0.11% aP. On d 21 post-weaning, considered d 0 of the study, pens were blocked by BW and randomly allotted to 1 of 8 dietary treatments with 5 pigs per pen and 9 pens per treatment. Dietary treatments were formulated to include increasing aP derived from either an inorganic P source (0.11, 0.19, or 0.27% from monocalcium P) or increasing levels of phytase (150, 250, 500, 1,000, or 1,500 FTU/kg). Diets were corn-soybean meal-based and contained 1.24% standardized ileal digestible (SID) Lys. On d 21 of the trial, 1 pig per pen (weighing closest to the mean pen BW) was humanely euthanized and the right fibula was collected to determine bone ash using the non-defatted processing method. Overall (d 0 to 21), pigs fed increasing aP from inorganic P or phytase had improved (linear,P<0.002) ADG, ADFI, and F/G. Bone ash weight and percentage bone ash increased (linear,P<0.001) with increasing inorganic P or added phytase. Based on these results, the release equations developed for GraINzyme for ADG, G:F, bone ash weight, and percentage bone ash are: aP = (0.255 × FTU) ÷ (1299.969 + FTU); aP = (0.233 × FTU) ÷ (1236.428 + FTU); aP = (45999.949 × FTU) ÷ (462529200 + FTU); and aP = (0.272 × FTU) ÷ (2576.581 + FTU), respectively.

Recommended Citation

Becker, Larissa L.; Wensley, Madie R.; DeRouchey, Joel M.; Woodworth, Jason C.; Tokach, Mike D.; Goodband, Robert D.; Gebhardt, Jordan T.; Raab, R. Michael; and Lessard, Philip A. (2021) "Determining the Phosphorus Release of GraINzyme Phytase in Nursery Pigs," Kansas Agricultural Experiment Station Research Reports: Vol. 7: Iss. 11. https://doi.org/10.4148/2378-5977.8190