The Effect of Yerba Mate (Ilex Paraguariensis) Supplementation on Nutrient Degradability in Dairy Cows: in Sacco and in Vitro Study

This study was carried out to investigate the effects of Yerba Mate supplementation on nutrients’ degradation, in vitro dry matter disappearance, gas production and rumen ammonia concentration. Three rumen-fistulated Holstein Friesian cows were used for the in situ incubations and provided rumen liquor for in vitro incubations. The inclusion of Yerba Mate (YM) in a control diet (pasture + pellets) affected some in sacco degradation parameters. YM supplementation decreased the effective degradability and degradation rate of pasture CP and it seems to slow down the degradation of pasture NDF. A significant increase of degradation of pasture ADF was detected after YM inclusion in the control diet. YM supplementation reduced in vitro gas production of pasture and ammonia concentration of pellets. The addition of Yerba Mate in ruminant diet could decrease ammonia production and increase protein availability for productive purposes. The moderate presence of tannins in Yerba Mate could have affected the degradation kinetics of pasture CP and ADF and the ammonia production of pellets