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The interactions between probiotic bacteria and the immune system in animals are known, but particularly in rabbits have not been sufficiently documented. Therefore the present study deals with the effect of the enterocin-producing probiotic strain Enterococcus faecium CCM7420 on the growth performance and jejunal morphometry in rabbits. Forty-eight weaned rabbits of male sex (NZB breed) at 5 weeks of age were randomly divided into experimental (EF) and control group (CG) with 24 rabbits in each group. Each day of the treatment period (21 days), the rabbits in the EF group were administered a fresh culture of the E. faecium CCM7420 strain (5.0 × 108 CFU/animal/day in their drinking water); for the next 21 days after probiotic cessation the rabbits had untreated drinking water (the whole experiment lasted for 42 days). All animals had access to water ad libitum. Three animals from each group were randomly selected for slaughter at days 21 and 42 of the experiment to measure morphological parameters (villus height (VH), crypt depth (CD), VH : CD ratio) of the intestinal tissue in the proximal jejunum. The average daily gain was higher in EF group (39.49 g) than in CG (39.04 g). The jejunum VH, surface area, and VH : CD ratio increased, while CD decreased in EF group compared to CG. Inferring from these results, we conclude that administration of E. faecium CCM7420 strain to rabbits may improve weight gain due to better utilization of feed and larger absorption surface in the gut and also may positively influence the health status via enhancing the gut health in rabbits.

czech journal of animal science

Effect of rabbit-origin enterocin-producing probiotic strain Enterococcus faecium CCM7420 application on growth performance and gut morphometry in rabbits