Furthermore, addition of PO and RPO in the diets increased milk fat while supplementation of
RPM resulted in greater milk protein and Fibrobacter succinogenes numbers (p < 0.05). The population of Ruminococcus
flavefaciens and Ruminococcus albus were not affected by any treatments. The findings on the present study
showed that supplementation with RPM and RPO to diets of cows improved the rumen environment and
increased milk yield, content of milk protein and milk fat.