| 摘要 |
Certain novel bipyridine substituted imidazoylidene compounds, their metal complexes (Cu, Fe and Ni) which are effective to improve feed efficiency and promote growth in food-producing animals, particularly ruminants. The compounds are described by the general formula <IMAGE> in which R1 and R2 are hydrogen, alkyl or phenyl, and including the cuprous, nickelous and ferrous salts thereof. |
