Brazilian and Egyptian propolis as modifiers for rumen fermentation and methane mitigation in vitro - Morsy, Amr S; Abdalla, Adibe Luiz; Soltan, Yosra A; Sallam, Sobhy Mohamed Abdallah; Alencar, Severino Matias de; Louvandini, Helder (International Seminar of the FAO-CIHEAM Network on Sheep and Goats – Sub-Network on Nutrition, 2012)