The use illumina sequencing technique in studying rumen bacteria diversity of Bali cattle given a feed comprised of elephant grass and rice straw

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Abstract

The diversity of rumen bacteria in ruminant animals is highly determined by various factors, including the age and the breed of the animal as well as the feed consumed. The purpose of this study was to evaluate the diversity of rumen bacteria of Bali cattle due to the provision of ration consisted of rice straw and elephant grass as a basal diet. Three adult Bali cattle were given a ration consisted of rice straw and elephant grass ad libitum for four weeks before taking the rumen fluid samples. In addition to the basal diet, each animal was also given a concentrate at the rate of 0.5% of the body weight. Rumen fluid samples were analyzed for pH, NH3 and VFA, while the diversity of the rumen bacteria was determined by the Illumina Sequencing technique. The results of the study showed that rumen conditions of the animal were ideal for the growth of the rumen bacteria, indicated by the value of rumen pH, NH3, and VFA of 6.8, 156.7 mg/L, and 114.3 mmol/L, respectively. Furthermore, based on SILVA taxonomy, two dominant phyla, i.e., Bacteroidetes and Firmicutes, were successfully identified in this study. At the genera level, the most dominant group identified was Prevotella 1, followed by the Christencenellaceae R-7 group. The analysis also showed the existence of an uncultured rumen bacterium with a percentage of 6.98%. In conclusion, the feed provided for the animal was good enough to support the growth of rumen bacteria and the Illumina sequencing technique used in this particular study was able to identify the existence of dominant rumen bacteria as well as the uncultured rumen bacterial of Bali cattle under such feeding conditions.

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Munir, M., Ako, A., Syahrir, S., & Natsir, A. (2020). The use illumina sequencing technique in studying rumen bacteria diversity of Bali cattle given a feed comprised of elephant grass and rice straw. In IOP Conference Series: Earth and Environmental Science (Vol. 492). Institute of Physics Publishing. https://doi.org/10.1088/1755-1315/492/1/012019

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