6NRC. Nutrient Requirements of Swine. NAS Washington, DC: National Academic Press, 1998.
7Honeyman M S. Sustainability issues of U S swine production. J Anim Sci, 1996, 74:1410 -1417.
8Komegay E T, Radcliffe J S. Relative bioavailability of phosphorus sources with different solubilities in neutral ammonium cit rate (NAC) for young pigs. J Anim Sci, 1997, 75: 188.
9Goihl J. Amino acid supplementation of low - protein swine diets explored[J]. Feedstuff, 1995, ( 11 ) :27.
10Harms, R. H., Russell, G. B. Optimizing egg mass with amino acid supplemention of a low - protein diet [J]. Poultry Science, 1993,(72) :1892 - 1896.
