The effect of green tea waste extract on ruminal degradability and intestinal digestibility of barley grain

This study was conducted to investigate the effects of different levels of green tea waste extract (GE) on ruminal degradability and intestinal digestibility of dry matter (DM), crude protein (CP), and starch of barley grain. Therefore, barley grain was treated with 0 as control, and 5%, 10%, 15%, and 20% of GE. The potential of DM degradability (a + b) of barley grain treated with 15% and 20% of GE was significantly lower compared to other treatments (Linear [L] P < 0.05). The lowest (a + b) fraction of CP degradability was found in the barley grain treated with 20% GE (L P < 0.05). The (a + b) fraction and effective degradability of starch in barley grain treated with 15% and 20% of GE were significantly lower than those in other treatments (L and quadratic [Q] P < 0.05). The highest intestinal DM, CP, and starch digestibility were associated with barley grain treated with 10% GE (L and Q P < 0.05). Rased on recent results, processing barley grain with GE leads to a decrease of DM, CP, and starch degradability. The treatment of 10% GE improved intestinal digestibility of the aforementioned nutrients; therefore, it can be used to protect barley grain against ruminal degradability.