8Radeeki, S V. Intestinal bacteria and their influnce on swine nutrition [ J ]. Swine Nutrition, 1991:439 - 447.
9Radecki. Effect of dietary copper on intestinal mucous enzyme activity, morphology and turnover rates in waling pigs[ J]. Anita Sci, 1992,70 : 1424 - 1434.
10S E Scheuermann . Effect of the probiotic paeiflor ( CIP 5832 ) on energy and protein metabolism in growing pigs [ J ]. Animal Feed Science and Technology , 1993, (41) : 181 - 189.
