2019. The Effect of Red Seaweed (Gracilaria sp.) Supplementation in Beef Cattle Feed to digestibility of dry matter and organic matter with in Vitro method. ANGON: Journal of Animal Science and Technology. 1, 3 (Jul. 2019), 213–2018. DOI:https://doi.org/10.20884/1.angon.2019.1.3.p213-2018.