**3.1.1** *Salmonella* **from ranch cattle**

Of the 212 cattle (115 adult cattle, 97 calves) investigated by Theis et al (2007), 15 (7%) tested positive for *Salmonella*. The prevalence of *Salmonella* among adult cattle and calves was 9/115 (7.8%) and 6/97 (6.2%), respectively. The 15 cattle that tested positive to *Salmonella* were distributed in three of the four counties with the majority originating from Billings county and no animal from Mercer county as follows: Stark (7/92, 7.6%), Billings (5/30, 6.6%), Dunn (3/60,5.0%), and Mercer (0/30, 0.0%). Thirteen (87%) of the 15 *Salmonella* isolates recovered were *Salmonella* Typhimurium (Copenhagen) and the rest (2/15, 13%) were *Salmonella* Worthington. All 15 *Salmonella* isolates from healthy cattle were susceptible to Apramycin, Ceftiofur, Entrofloxacin, Gentamicin, and Neomycin. All samples were resistant to Chlortetracycline, Clindamycin, Erythromycin, Florfenicol, Oxytetracycline,

Penicillin, Sulphachlorophridazine, Sulphadimethoxime, Sulphathiazole, Tiamulin, Tilmicosin. Two isolates (both *Salmonella* Worthington), were susceptible to Ampicillin, whereas the other thirteen samples (all *Salmonella* Typhimurium (Copenhagen), were resistant to Ampicillin and to Spectinomycin.
