RNA, Ribosomal, 18S - genetics, Fungi - isolation & purification, Silage - analysis, Archaea - isolation & purification, Alveolata - isolation & purification, Bacteria - genetics, Fungi - genetics, Cattle - microbiology, Dietary Supplements - analysis, Alveolata - genetics, Feces - microbiology, Bacteria - isolation & purification, Animals, Animal Nutritiona...