title: Contribution of protozoa to lysine synthesis in the in vitro rumen microbial ecosystem.
abstract: Isotopic tracer experiments were conducted in vitro to determine contribution of protozoa toward the biosynthesis of lysine in the rumen microbial ecosystem. The presence of protozoa in a rumen microbial suspension always increased lysine synthesis from aspartate. Rumen contents from a faunated goat produced a higher amount of lysine than did those from a defaunated one.
mesh_terms: D000818:Animals; D001224:Aspartic Acid / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D056890:Eukaryota / Q000378:metabolism*; D005260:Female; D006041:Goats / Q000382:microbiology / Q000469:parasitology*; D008239:Lysine / Q000096:biosynthesis*; D012417:Rumen / Q000382:microbiology / Q000469:parasitology*
chemical_list: D001224:Aspartic Acid; D008239:Lysine