ISSN:
1432-0614
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Summary The effect of the feedlot antibiotic avoparcin (trade name Avotan) on pure and mixed cultures of rumen bacteria has been studied. Of the Gram negative bacteria tested, all except Bacteroides succinogenes were able to grow in the presence of 200 μg avoparcin ml−1. Some strains of Lactobacillus acidophilus and L. casei also grew in the presence of high concentrations of avoparcin, but most Gram positive bacteria, even after adaptation, could not grow in the presence of 8 μg avoparcin ml−1. Of the cellulolytic bacteria, Ruminococcus flavefaciens was most susceptible to growth inhibition by avoparcin and this organism, unlike the majority of Gram positive bacteria tested, failed to increase its avoparcin tolerance by adaptation. When added to a mixture of rumen contents and buffer in vitro at 5 and 10 μg ml−1, avoparcin had little effect on the digestion of dried grass and straw. The results are discussed in relation to the possible mode of action of avoparcin on the rumen bacterial flora.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00508023
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