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当前位置: 首页 > 文章 > Effects of a novel bacterial phytase expressed in Aspergillus Oryzae on digestibility of calcium and phosphorus in diets fed to weanling or growing pigs 畜牧与生物技术杂志(英文版) 2013,4
Position: Home > Articles > Effects of a novel bacterial phytase expressed in Aspergillus Oryzae on digestibility of calcium and phosphorus in diets fed to weanling or growing pigs Journal of Animal Science and Biotechnology 2013,4

Effects of a novel bacterial phytase expressed in Aspergillus Oryzae on digestibility of calcium and phosphorus in diets fed to weanling or growing pigs

作  者：
F. N. Almeida;R. C. Sulabo;Hans H Stei
单  位：
Department of Animal Sciences, University of Illinois, Urbana, US;Dept. of Animal Sciences, University of Illinois, Urbana, USA;Department of Animal Sciences, University of Illinois, Urbana, USA
关键词：
Calcium;Digestibility;Phosphorus;Phytase;Pigs;TOTAL TRACT DIGESTIBILITY;SOYBEAN MEAL DIETS;MICROBIAL PHYTASE;YOUNG-PIGS;NIGER PHYTASE;APPARENT DIGESTIBILITY;AVAILABLE PHOSPHORUS;INORGANIC PHOSPHORUS;GROWTH-PERFORMANCE;TRUE DIGESTIBILIT
摘  要：
In 2 experiments, 48 weanling (initial BW: 13.5 +/- 2.4 kg, Exp. 1) and 24 growing pigs (initial BW: 36.2 +/- 4.0 kg, Exp. 2) were used to determine effects of a novel bacterial 6-phytase expressed in Aspergillus oryzae on the apparent total tract digestibility (ATTD) of phosphorus and calcium in corn-soybean meal diets fed to weanling and growing pigs. In Exp. 1 and 2, pigs were randomly allotted to 6 dietary treatments using a randomized complete block design and a balanced 2 period changeover design, respectively. In both experiments, 6 diets were formulated. The positive control diet was a corn-soybean meal diet with added inorganic phosphorus (Exp. 1: 0.42 and 0.86% standardized total tract digestible phosphorus and total calcium, respectively; Exp. 2: 0.32 and 0.79% standardized total tract digestible phosphorus and total calcium, respectively). A negative control diet and 4 diets with the novel phytase (Ronozyme HiPhos, DSM Nutritional Products Inc., Parsippany, NJ) added to the negative control diet at levels of 500, 1,000, 2,000, and 4,000 phytase units (FYT)/kg were also formulated. In Exp. 1, the ATTD of phosphorus was greater (P < 0.01) for the positive control diet (60.5%) than for the negative control diet (40.5%), but increased (linear and quadratic, P < 0.01) as phytase was added to the negative control diet (40.5% vs. 61.6%, 65.1%, 68.7%, and 68.0%). The breakpoint for the ATTD of phosphorus (68.4%) was reached at a phytase inclusion level of 1,016 FYT/kg. In Exp. 2, the ATTD of phosphorus was greater (P < 0.01) for the positive control diet (59.4%) than for the negative control diet (39.8%) and increased (linear and quadratic, P < 0.01) as phytase was added to the negative control diet (39.8% vs. 58.1%, 65.4%, 69.1%, and 72.8%). The breakpoint for the ATTD of phosphorus (69.1%) was reached at a phytase inclusion level of 801 FYT/kg. In conclusion, the novel bacterial 6-phytase improved the ATTD of phosphorus and calcium in both weanling and growing pigs. The optimum level of inclusion for this phytase is 800 to 1,000 FYT/kg of complete feed to maximize ATTD of phosphorus and calcium in weanling and growing pigs.

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