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CCA illustrating the relationship between the structure of the bacterial community (A) or methanogen community (B) with the rumen fermentation pattern in the Rusitec system. Arrows show the direction of the gradient and their length is proportional to the correlation. Arrows longer that the dotted circle are significant (P < 0.05). Centroid is indicated for each treatment: Control (CON), chitosan (CHI) and ivy fruit saponins (IVY). Animals used as donors are indicated in numbers.
