The effects of dietary Lactococcus spp. on growth performance, glucose absorption and metabolism of common carp, Cyprinus carpio L.

Abstract Based on beneficial effects of Lactococcus spp. and their extracellular polysaccharides on common carp (Cyprinus carpio L.) in previous studies, the main purpose of this paper was to investigate the functions of single or multi-strains of Lactococcus spp. on the growth performance, glucose absorption and metabolism of common carp. The results showed that when the fish consumed diets containing single (Lactococcus lactis Q-8, L. lactis Q-9, L. lactis Z-2) or multi-strains of Lactococcus spp. (5 × 108 CFU g−1 of feed) for 60 days, the final weight, weight gain (WG), specific growth rate (SGR) and condition factor (CF) had significantly (P   .05). For the glucose absorption, Lactococcus spp. addition groups significantly increased the blood glucose concentration and up-regulated the expression of Sglt1 and Gult2 in intestine compared with the control group (P