Growth-promoting feed and drink

摘要

Animal feeds and drinks containing small amounts of compounds of the formula Ia or Ib <IMAGE> Ia <IMAGE> Ib where R1 is hydrogen, low molecular weight alkyl or alkoxy, or halogen, R2 is hydrogen or low molecular weight alkyl and R3 and R4 are hydrogen or a low molecular weight aliphatic or araliphatic radical. The compounds of the formulae Ia and Ib promote growth without exerting an antibiotic action.