| 摘要 |
This disclosure describes novel antibacterial agents designated LL-E19085 beta , LL-E19085 gamma , LL-E19085 zeta and LL-E19085 eta , their production by aerobic fermentation of a new subspecies of Micromonospora citrea NRRL 18351 and mutants thereof, and the isolation and purification thereof. This invention provides methods for increasing the growth rate of warm-blooded animals, for improving the efficiency of feed utilization by said animals, for increasing lactation in lactating ruminant animals and for increasing the wool production of sheep. The invention also relates to novel animal feed compositions and parenteral compositions useful in obtaining the above-described results. |
