Comparison of the in vitro efficiency of supplementary bee propolis extracts of different origin in enhancing the ruminal degradability of organic matter and mitigating the formation of methane - Morsy, Amr Salah; Soltan, Yosra Ahmed; Sallam, Sobhy Mohamed Abdallah; Kreuzer, Michael; Alencar, Severino Matias de; Abdalla, Adibe Luiz (Animal Feed Science and Technology, 2015)