What role does green tea and oregano play in cow diets?

In a recent study oregano and green tea extracts were fed to Jersey cows during the transition period. Researchers looked at the impact of these plant extracts on Jersey cows. The study: Impact of oregano and green tea extracts on transitioning cows The research, which was carried out in Brazil by E.F. Vizzotto et al., looked at plant extracts oregano and green tea and their impact on the transitioning Jersey cow. The extracts were fed to Jersey cows from approximately 21 d before calving t