Estimated Zn equivalency values of phytase in corn-soybean meal-based diets for weanling pigs [Sus scrofa var. domesticus]
2006
Kaji, Y.(National Agricultural Research Center for Kyushu Okinawa Region, Koshi, Kumamoto (Japan)) | Abe, S. | Mizukami, S.
Twenty-eight castrated male Landrace pigs aged six weeks were used in a 4-week trial to investigate the effect of microbial phytase on growth performance and serum parameters. A corn-soybean meal-based diet containing 27.7 mg of Zn/kg of diet was fed alone and supplemented with 20 or 40 mg of Zn/kg of diet as ZnCO3 or with 350, 700, 1050, or 1400 U of phytase/kg of diet. Blood was collected on d 21 of the trial for serum Zn concentration and alkaline phosphatase activity. BW gain and feed intake of pigs increased both linearly and quadratically with adding Zn and phytase to the low Zn basal diet (P 0.01). Feed conversion ratio improved linearly by adding Zn and phytase (P0.05). Serum Zn concentration and alkaline phosphatase activity were linearly increased by adding Zn (P0.05) and phytase (P0.01). Nonlinear or linear response equations of the effects of Zn and phytase levels were generated and used to calculate the Zn equivalency values. The average function of Zn equivalency values (Zn, milligrams per kilogram) of microbial phytase (Phy, units per kilogram of diet) was developed based on FI, DG, and FCR : Zn
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