The Effects Of Yeast Culture On The Growth Performance And Several Important Microorganisms In Feces Of Weaned Pigs

To study the effects of several yeast cultures on the growth performance and several important microorganisms in feces of weanling pigs, a total of 150 26-day-old healthy weanling pigs(Duroc×(Landrace×Yorkshire)), 75 ?&75 ?) were randomly divided into 5 groups according to consistent average weight, each group with 3 replicates and 10 pigs each. The feeding experiment was lasted for 36 days. Five groups were fed the basal diet(control group), basal diet with 1% brewer‘s yeast primary culture, basal diet with 1% saccharomyces cerevisiae culture, basal diet with 1% saccharomyces cerevisiae secondary culture enriched with nucleotide and basal diet with 1% brewer's yeast culture enriched with small peptide. During the experimental period, feed intake(FI) and diarrhea rate were recorded every day. In the end of trial, the serum samples of three healthy piglets from each group were collected to determinate serum antioxidant indexes by vena cava anterior and centrifuge. Feces from each replicate were collected to determinate microbiological compositions and indexes of energy and protein digestibility.The results showed that:(1) compared with control group, dietary supplementation with 1% brewer's yeast culture enriched small peptide significantly increased average daily gain of piglets by 14.92%(P<0.05); the groups with 1% brewer's yeast primary culture and 1% brewer‘s yeast culture enriched small peptide increased the average daily feed intake by 11.67%(P<0.05) and 13.51%(P<0.05) respectively.(2) There was no significant different showed in apparent digestibility of gross energy and CP among the five groups(P>0.05).(3) Different yeast culture supplemented in diets didn't significantly affect the content of MDA, TSOD and GSH in serum of piglets(P>0.05).(4)Compared with the control group, the amount of Lactobacillusin feces of group with 1% brewer‘s yeast primary culture showed a higher amount of Bifidobacterium in feces by 14.47%, and the groups supplemented with 1% brewer's yeast primary culture and 1% brewer's yeast culture enriched in small peptide had a higher amount of Bifidobacterium in feces by 7.58%(P<0.05) and 12.10%(P<0.05), respectively.In summary, it showed a better effect of promoting growing performance in brewer's yeast culture compared with saccharomyces cerevisiae culture, and the best response presented in piglets fed diet with 1% brewer's yeast enriched in small peptide. The reasons were possibly because of the increase of feed intake and amount of probiotics in intestine.