The experiment was aimed to investigate the effects of Lactobacillus fermentum supplementation on growth performance, digestive and absorptive function of juvenile Jian carp (Cyprinus carpio var. Jian). In 80 days of feeding trial, a total of 720 juvenile Jian carp with average body weight of (22.35±0.06) g were randomly allocated to 6 groups with 3 replicates per group and 40 fish per replicate. The fish in the 6 groups were fed 6 experimental diets containing graded levels of L. fermentum: 0 (control group), 0.45×107, 0.91×107, 1.31×107, 2.14×107 and 2.40×107 cfu/g diet, respectively. The results showed as follows: the final body weight, weight gain ratio and feed intake in L. fermentum supplementation groups were significantly higher than those in control group (P<0.05 or P<0.01). When L. fermentum supplementation>0.45×107 cfu/g, the productive protein value and productive lipid value of juvenile Jian carp were significantly increased (P<0.01); when L. fermentum supplementation>0.91×107 cfu/g, the productive ash value of juvenile Jian carp was significantly increased, too (P<0.01). L. fermentum supplementation could significantly enhance the weight and protein content of hepatopancreas and gut, and fold height in foregut, midgut and hindgut of juvenile Jian carp (P<0.05 or P<0.01). When L. fermentum supplementation>0.45×107 cfu/g, the activities of chymotrypsin, lipase and amylase in gut were significantly increased (P<0.01); when L. fermentum content>0.91×107 cfu/g, the trypsin activity in gut was significantly increased, too (P<0.05). Compared with those in control group, the activities of alkaline phosphatase, Na+,K+-ATPase and γ-glutamyl transpeptidase in foregut, midgut and hindgut, and creatine kinase in gut of juvenile Jian carp in L. fermentum supplementation groups were significantly increased (P<0.05 or P<0.01). These results indicate that L. fermentum supplementation can promote the growth, improve the growth and development of digestive organs and enhance the digestive and absorptive function of juvenile Jian carp. The optimal L. fermentum supplementation for maximum weight gain ratio of juvenile Jian carp is 0.99×107 cfu/g diet based on broken-line regression.［Chinese Journal of Animal Nutrition, 2011, 23（8）：1386 -1393］
LIU Yu,FENG Lin,CHEN Gangfu,LIU Yang,WU Pei,ZHOU Xiaoqiu
. Effect of Lactobacillus fermentum Supplementation on Growth Performance, Digestive and Absorptive Function of Juvenile Jian Carp
(Cyprinus carpio var. Jian)[J]. Chinese Journal of Animal Nutrition, 2011
, 23(08)
: 1386
-1393
.
DOI: 10.3969/j.issn.1006-267x.2011.08.018
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