Table 6.

A summary of the average and range of Dice similarity coefficients between 51 isolates of Mycoplasma bovis collected from nasal, joint, and lung swabs at arrival, treatment, and postmortem of cattle at a southern Saskatchewan feedlot during the fall of 2007 and 2008. The pairwise comparisons are summarized by calf, pen, and study year. 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)

				Isolates	Average (range) of pairwise comparisons between isolates
Year	Pen	Animal	Treatment group	Sites and DOFa	Calf	Pen	Year
2007	1	21	META	Arth-76		78 (62–95)	83 (48–100)
		148	NO-META: HOME	BRD-19, PM-lung-31	95
		227	META: HOLD	Arth-56
	2	98	META: HOME	PM-lung-57		100
	3	114	META: HOME	BRD-79, PM-lung-91	95	82 (70–95)
		130	META: HOME	PM-joint-24, PM-lung-24	76
	4	91	NO-META: HOLD	BRD-35, BRD-37	93	93 (93–93)
		150	META: HOME	PM-lung-23
	6	211	NO-META: HOLD	BRD-18, PM-lung-37	98	98
	7	5	META	Arth-34		87 (56–100)
		22	META: HOME	BRD-22
		23		Control-arrival
		77	META	Arth-24
		110	META: HOME	PM-lung-22
		144		Control-arrival
		159	META: HOLD	BRD-4, BRD-6, PM-lung-57, PM-joint-57	80 (60–100)
		257	NO-META: HOLD	BRD-1, BRD-3, BRD-13, PM-lung-21	95 (92–98)
2008	11	21	META: HOLD	BRD-27		86 (49–100)	84 (49–100)
		37	META	PM-lung-71
		106	META: HOME	PM-lung-31
		175	NO-META: HOLD	BRD-54
		193	NO-META: HOLD	BRD-23
		243	NO-META: HOLD	Arth-23, BRD-49, PM-lung-64	90 (86–100)
		246	NO-META: HOME	PM-lung-64
	13	173	META	Arth-41		100
		218	META: HOME	Arth-34
	14	135	META	Arth-58		77 (54–97)
		200	META: HOME	Arth-31, Arth-43	97
		220	META: HOME	BRD-36
	15	55	NO-META	PM-lung-98		96 (90–100)
		111	NO-META	PM-lung-35
		160	NO-META	Arth-16
		179	NO-META: HOLD	BRD-13, BRD-21	97
		186	NO-META: HOME	PM-lung-29
		206	META: HOME	BRD-19
		231	META: HOLD	BRD-15

^aSites: deep nasal swab taken at treatment of BRD or arthritis; swab collected from lung or joint at postmortem; followed by days on feed (DOF) of sample collection.