Effect of the Transformed Lactobacillus with Phytase Gene on Pig Production Performance, Nutrient Digestibility, Gut Microbes and Serum Biochemical Indexes (Report‪)‬

INTRODUCTION Phytic acid exists in the diets of pigs and serves as a P reservoir. It is such a powerful chelating agent that the solubility and digestibility of many nutrients are reduced by the formation of phytate complexes (Selle, 1997). Phytase can catalyze the hydrolysis of phytate and release organic P and phytate-bound nutrients (Wodzinski, 1996; Murry et al., 1997). Because there is little phytase activity in the digestive tracts of the non-ruminant animals (Bitar and Reinhold, 1972), these animals can't use nutrients effectively, specially the phytate-bound P (Sweeten, 1992), resulting in a significant loss of P to the environment. The addition of phytase in animal diet can reduce P excretion by 30-50% for decreasing P pollution as well as reduce the supplementation of inorganic P in animal diets (Selle, 1997).