The two diets
differed only in their concentrate supplement. The control group received 450 g/head per day of a concentrate
feed without chestnut tannin extract, whereas the CHE group received 500 g/head per day of
a concentrate feed formulated with the same ingredients of the control concentrate plus 80.0 g/kg DM
of chestnut tannin extract. The amounts of concentrate offered to the animals of both groups were calculated
in order to obtain isoproteic and isoenergetic dietary treatments considering the expected DM
intake of animals. The inclusion of chestnut tannin in the concentrate resulted in a greater production
of milk (+18.64%; P < 0.001).