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Background  Application the innovative method which is in ovo technology provides a means of modulating the immune system at early embryonic stages. The aim of study was to determine influence of the in ovo stimulation, on d 12 of incubation, with synbiotics (synbiotic 1-  L. salivarius  IBB3154 + Bi 2 tos, Clasado Ltd. and the synbiotic 2 -  L. plantarum  IBB3036 + lupin RFOs) on the microstructure of duodenum, jejunum and ileum in the 1 st  and 42 nd  day of rearing.    Results  On the 1 st  day of chickens life, in the duodenum of both experimental groups (SYN1 and SYN2), a significantly higher and wider intestinal villi as well as a significantly larger absorbent surface of these villi were found in comparison with the Control group ( P  ≤ 0.01). On the 42 nd  day of rearing the beneficial effect of synbiotic 1 was reflected by the numerically higher villi (no statistical differences) with a larger surface ( P  ≤ 0.01) in the duodenum in the SYN1 group compare to the Control group. In the jejunum on the 1 st  day of life, in the SYN1 group, significantly higher villi than in the Control group, with a simultaneous decrease in the depth of crypts ( P  ≤ 0.01), and also the largest width of villi and their absorbent area ( P  ≤ 0.01) in comparison to the other groups were found. On the 42 nd  day of life, in the jejunum, an increase in the height of the villi whilst reducing the crypt depth in the SYN2 group was found ( P  ≤ 0.01). In turn, in the SYN1 group, there were significantly more neutral goblet cells observed compared with the control group ( P  ≤ 0.05). In the ileum of 1-day-old chickens, the widest villi ( P  ≤ 0.05) and the deepest crypts ( P  ≤ 0.01) were found in the SYN2 group. In the same group, there was also the least amount of neutral goblet cells in comparison to the other groups ( P  ≤ 0.05).    Conclusions  We observed that synbiotic 1 and 2 beneficially affected the examined characteristics on the 1 st  and 42 nd  day of life. The obtained results allow us to conclude that the use of synbiotics significantly affect gut structure which should contribute to improvement in nutrient absorption by the gut.

journal of animal science and biotechnology/journal of animal science and biotechnology

The impact of synbiotic administration through in ovo technology on the microstructure of a broiler chicken small intestine tissue on the 1st and 42nd day of rearing