Table 5.

Results of a logistic regression analysis to determine factors associated with the isolation of Mycoplasma bovis from nasal, joint, and lungs swabs collected at arrival, treatment, and postmortem of cattle at a southern Saskatchewan feedlot during the fall of 2007 and 2008. Cattle were allocated to receive oxytetracycline metaphylaxis on arrival to the feedlot (META) or no antimicrobials (NO-META) on arrival and by first BRD treatment of two 20 mg/kg body weight (BW) IM doses of florfenicol administered 48 h apart (HOLD) or a single 40 mg/kg BW SQ dose of florfenicol on first diagnosis (HOME). The independent variables, odds ratio, 95% confidence interval (CI), and P-values are reported

Outcome	Independent variable	Odds ratio	95% CI	P-value
Isolation of Mycoplasma bovis	Treatment versus Arrival	60	13–280	< 0.01
	Death versus Arrival	40	9–172	< 0.01
	2007 versus 2008	1.2	0.82–1.6	0.38
	META versus NO-META	0.91	0.33–4.5	0.81
	Treated for BRD (Yes or No)	2.2	0.83–5.3	0.42
	Treated for Arthritis (Yes or No)	4.7	0.21–16	0.59