Urease is an enzyme of wide distribution as evidenced by the fact that some 200 species of bacteria, as well as higher plants and animals have been found to possess it (Sumner and Somers, 1953). Pasteur and Miguel were reported to have isolated "urobacilli" from air, soil, and sewage (Cooke and Keith, 1927). Subsequently, the enzyme was found in many soil and intestinal bacteria (Gibson, 1934; ...

Developing novel strategies for improving the fatty acid composition of ruminant products relies upon increasing our understanding of rumen bacterial lipid metabolism. This study investigated whether flax or echium oil supplementation of steer diets could alter the rumen fatty acids and change the microbiome. Six Hereford × Friesian steers were offered grass silage/sugar beet pulp only (GS), or...