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Sensitivity of ruminal bacteria isolates of sheep, cattle and buffalo to some heavy metals

AuthorsSalem, A. Z. M.; Ammar, H.; López, Secundino ; Gohar, Y. M.; González, Jesús Salvador
KeywordsHeavy metals
Clearance zone
Ruminal bacteria isolates
Issue Date2011
CitationAnimal Feed Science and Technology 163(2-4) : 143-149 (2011)
AbstractThis study was conducted to investigate the toxicity of 12 heavy metals (i.e., HM), namely Hg, Cd, Co, Ni, Cr, Cu, Ag, Mo, Zn, Pb, Li and Na on bacterial isolates from the rumen of sheep, cattle and buffaloes. Rumen samples were collected immediately after slaughter during the dry season. Ruminal bacterial isolates, 59, were obtained from two sheep, five cows and nine buffaloes. Sensitivity of ruminal bacterial isolates to each HM was determined by the clearance zone (CZ) using the Kirby-Bauer disc diffusion susceptibility test. Bacterial populations isolated from the rumens of sheep and buffalo had a lower resistance (P<0.001) to HM toxicity than did cattle. Regardless of ruminant species, bacterial isolates revealed a higher tolerance (P<0.001) to Li and Na, whereas Hg and Cd were the most toxic HM for all isolates. We conclude that inhibition of these HM to the isolated microbial population of sheep, cattle and buffalo is ranked: Hg (most toxic) > Cd > Co similar to Ag similar to Cu similar to Cr similar to Ni > Mo similar to Zn similar to Pb > Li similar to Na. Further research is required to explain the mechanism of toxicity of these HM, and also to explore the variation among ruminant species.
Description7 páginas, 2 figuras.
Publisher version (URL)http://dx.doi.org/10.1016/j.anifeedsci.2010.10.017
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