7Morz Z,Jongbloed A W,Partanen K,et al.Ileal digestibility of amino acids in pigs fed diets of different buffering capacity and with supplementary organic acids[J].Journal of Animal And Feed Science,1998(7):191-197.
8Boling S D,Webel D M,Mavromichalis I,et al.The effect of citric acid on phytate-phosphorus utilization in young chicken and pigs[J].Journal of Animal Science,2000,78(3):682-689.