| continuous non-therapeutic use of antibacterial drugs in feed and drug resistance of the gram-negative enteric florae of food-producing animals. | fecal samples from illinois farm animals and montana range cattle were examined for the frequency of gram-negative enteric organisms resistant to oxytetracycline, dihydrostreptomycin, or ampicillin. the illinois farm animals were continually fed rations containing various antibacterial drugs. the montana range cattle had minimal exposure to antibacterial drugs. the majority of samples from illinois farm animals demonstrated 10% or more antibiotic-resistant organisms. in contrast, resistant organ ... | 1974 | 4615630 |
| incidence of clostridium perfringens in neonatal enteritis of montana calves. | | 1970 | 4317474 |
| occurrence and characteristics of enterotoxigenic escherichia coli isolated from calves with diarrhea. | of 1,004 isolates of escherichia coli obtained during the spring of 1975 in seven different states from calves with diarrhea, 124 isolates were enterotoxigenic based upon ability to cause distention of the calf ligated intestinal segment. isolates of enterotoxigenic e. coli (etec) were obtained from calves in six of the seven states. etec were detected in calves in 118 of 355 herds in montana during the 1974 and 1975 spring beef calving seasons. the occurrence and serotypes of etec isolated from ... | 1976 | 776828 |