1Smith J W,Nelssen R D, Goodband M D. The effects of supplementing growing-finishing swine diets with betaine and (or)choline on growth and carcass charactertistics[J]. J Anim Sci, 1995, 73:83.
2Campbell R G. New technologies exploit pigs potential for growth [ J]. Feedstuffs, 1995,7:12 - 13.
3Webel D M. The effect of betaine supplementation of growth performance and carcass characteristics in finishing pigs [ J ]. J Anim Sci, 1995, 73:82.
4Cera K R. Carcass and performance responeser to feeding betaine in pigs [ J ]. J Anim Sci, 1995, 73:82.
5Haydon K D, R G CampbeU,T J Prince. Effect of dietary betaine additions and amino acid:calorie ratio on performance and carcass traits of finishing pigs [J]. J Anim Sci, 1995, 73:83.
6Shurson J. Paper Presented at the Minnesota nntrition conference and Roche technical Symeosinm [ C ]. September 19 - 21, Bloomington MN, 1994,67-79.
7Finkelstein J D , Mudd S H. Trans-sulfuration in mammals:the methionine-sparing effect of cysteine [ J ]. Biolo Chem, 1967, 242:873 - 880.
8Lowey K R , D H Baker. Eflqeaey of betaine ralative to choline as a dietary methyl donor[ J ]. Poultry Sei, 1987, 66:135 -140.
9Peter Best. Designer nutrition for pig:Feeding against back[ J ]. Feed Internation, 1994, 5:38 -40.
