Dietary Addition of Garlic Straw Improved the Intestinal Barrier in Rabbits1

Weanling rabbits frequently exhibit diarrhea or flatulence. Our experiment was conducted to investigate the effect of garlic straw on the performance and intestinal barrier of rabbits. Hyla rabbits (60 d, n = 160) with similar body weight were divided into 4 groups (4 replicates per group and 10 rabbits per replicate): fed a basal diet (control) or fed an experimental diet with 5%, 10%, or 15% garlic straw powder supplement. The results showed that the dietary addition of garlic straw increased significantly the average daily gain and average daily feed intake. Compared with the control, dietary addition of 10% and 15% garlic straw decreased significantly the death rate of rabbit. Rabbits in 10% garlic straw group had a higher secretory immunoglobulins A and immunoglobulins G concentration in jejunum and ileum than control while lower tumor necrosis factor α (TNFα) concentration in jejunum. Compared with the control, dietary addition of 10% garlic straw increased significantly genes expression of zonula occluden protein 2 (ZO2) in jejunum and ileum and mucin4 in ileum while did not alter the genes expression of junctional adhesion molecule 2 (JAM2), JAM3, ZO1, occluding, claudin1, mucin1, mucin6, and toll-like receptor 4 in jejunum and ileum and mucin4 in jejunum. In conclusion, dietary supplement of garlic straw modulates immune responses and enhances intestinal barrier, meanwhile inhibits the synthesis of pro-inflammatory cytokine of TNFα. Besides, our experiment offers positive evidence in improving rabbit health of garlic instead of antibiotics.