8BIEHI R R, BAKER D H, DELUCA H F. 1 - hydroxylated cholecaleiferol compounds act additively with microbial phytase to improve phosphorus, zinc, and manganese utilization in chicks fed soy- based diets[J]. Journal of Nutrition, 1995,125:2407-2416.
9SIMONS P C M, VERSTEEGH H A J, JONGBLOED A W, et al. Improvement of P availability by microbial phytase in broilers and pigs[J]. British Journal of Nutrition, 1990,64:525- 540.
10KORNEGAY E T, QIAN H. Replacement of inorganic phosphorus by microbial phytase for young pigs fed on a maize - soyabean - meal diet [ J ]. British Journal of Nutrition, 1996,76 (4) : 563 - 578.
