3Cromwell. The biological availability of phosphorus in feedstuffs for pigs[J].Pig news and information, 1992,13(2):75～78.
4Jongbloed A W,KemmeApparent digestible phosphorus in the feeding of pigs in relation to availability,requirement and environment 1 Digestible phosphorus in feedstuffs from plant and animal origin [J].Neth J Agric Sci,1990,38:567～575.
