[Chlortetracycline residues in the meat of slaughter calves in relation to transmissible microbial resistance to antibiotics].
The occurrence of chlortetracycline residues in the meat of slaughter calves in 62% herds under study (the additive of the medicated premix AUREOVIT to feed without observing the withdrawal times) did not influence significantly the Gram-negative resistant and R+ microflora isolated from the same material, in comparison with control herds that were administered no antibiotics. Neither was the spectrum of donors and transferring R plasmids influenced significantly nor the incidence of different resistance determinants. The effect of chlortetracycline addition to feed was negative (at P = 0.05) only in the occurrence of R+ microflora isolated from stable environment where the slaughtered calves had been housed.
D000818:Animals; D001419:Bacteria / Q000187:drug effects / Q000302:isolation & purification*; D002417:Cattle; D002751:Chlortetracycline / Q000032:analysis*; D004352:Drug Resistance, Microbial; D005516:Food Microbiology; D008460:Meat / Q000032:analysis*; D011815:R Factors
D002751:Chlortetracycline
Rezidua chlortetracyklinu u jatecných telat ve vztahu k prenosné mikrobiální rezistenci na antibiotika.