Utilizing local microorganisms with different dosages and duration of fermentation towards digestibility and rumen activity of oil palm frond in vitroRandi Mulianda, Ma’ruf Tafsin, Nevy Diana Hanafi and dan YulinasE3S Web Conf., 52 (2018) 00036DOI: https://doi.org/10.1051/e3sconf/20185200036