7Goerl K F, Eilert S J. Pork characteristics as affectedby two populations of swine and six crude protein levels [J]. Animal Science, 1995, 73: 3621-3623.
8Rivas A,Fabricant J.Indication of Immundepression in chicken infected with Various strain of Marek's Disease Virus[J].Arian Disease,1985,32:1~ 8.
9Tsiagbe V K,et al.Enhanced immune responses in broiler chicks fed methionine supplemented diets[J].Poultry Science,1987,66:1147~1154.
10Wilson P N,Osbourn D F.Compensatory growth after under nutrition in mammals and birds[J].Biological Reviews Cambridge Philosophical Society,1960,35(3):324-363.