4Barnett K I., E T Kornegay, C R Risley. 1989. Characterization of creep feed consumption and its subsequent effects on immune response scouring index and performance of weanling pigs[J].J Anim. Sci.,67:2698-2708.
5Burnell T W, G L Cromwell ,T S Stahly. 1988. Effects of dried whey and copper sulfate on growth response to organic acid in diets for weaning pigs[J] .J Anim. Sci., 66: 1100- 1108.
6Eckel B , M Kirchgessner , F X Roth. 1992. Influence of formic acid on daily weight gain, feed intake, feed conversion rate and digestibilities[] ]. Pig News and Information , 13(3) : 274.
7Eidelsburger U, M Kirchgessner, F X Roth. 1993. Influence of fumaric acid , hydrochloric acid, sodium formate,tylosin and toyocerln on acid-base status []].Pig News and Information, 14( ) : 76.
8Giesting D W, R A Easter. 1986. Acidification status in swine diets[J] . Feed Management, Nov. 8, 10, .53.
9Mahan D C , E A Newton,K R Cera. 1996.Effect of supplemental sodium chloride, sodium phosphate,or hydrochloric acid in starter pig diets containing dried whey[J] .J Anim. Sci., 74: 1217- 1222.
10Straw M L,E T Kornegary,J L Evans and C M Wood. 1991. Effects of dietary pH and phosphorus source on performance, gastrointestinal tract digesta.and bone measurements of weanling plgs[J]. J Anim . Sci,69: 4496 - 4504.
