49 Determining the Phosphorus Release of Grainzyme Phytase in Diets for Nursery Pigs. (12th April 2022)

• Record Type: Journal Article
• Authors: Becker, Larissa L; Wensley, Madie R; DeRouchey, Joel M; Woodworth, Jason C; Tokach, Mike D; Goodband, Robert D; Gebhardt, Jordan T; Raab, R Michael; Lessard, Philip
• Is Part Of: Journal of animal science. Volume 100(2022)Supplement 2
• Page Start: 18
• Page End: 18
• Publication Date: 2022-04-12
• Subjects: bone ash -- nursery pigs -- phosphorus -- phytase; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/skac064.030
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: A total of 360 pigs (Line 200 × 400, DNA, Columbus, NE, initially 9.9 ± 0.19 kg) were used in a 21-d growth study 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 body weight (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/pen and 9 pens/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 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/pen (weighing closest to the mean pen BW) was 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 increased (linear, P < 0.002) ADG, ADFI, and G:F (quadratic, P < 0.05). Bone ash weight (g) and percentage bone ash increased (linear, P < 0.001) with increasing inorganic P or added phytase. The release equations developed for GraINzyme for ADG, G:F, bone ash weight, and percentage bone ash are: aP = (0.255 × FTU) ÷ (1, 299.969 + FTU), aP = (0.233 × FTU) ÷ (1, 236.428 + FTU), aP = (45, 999.949 × FTU) ÷ (462, 529, 200 + FTU), and aP = (0.272 × FTU) ÷ (2, 576.581 + FTU), respectively.