In-feed resin acids reduce matrix metalloproteinase activity in the ileal mucosa of healthy broilers without inducing major effects on the gut microbiota.

Although still numerically lower in the resin acids-supplemented group, this difference did not reach statistical significance when looking to the specific collagen type I or collagen type IV breakdown in the jejunal tissue ( p = 0.14 or p = 0.21 respectively, Figures 4 E and F).

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