Table 7.

Percent (number) of herds^a recording various antimicrobial drug treatments used in cows/heifers from January 1 to June 1, 2002.

Treatment	Never used, percent (number)	Used 1–3 times, percent (number)	Used 4–10 times, percent (number)	Used >10 times, percent (number)	Herds ever used, percent (number)
Cow oxytetrcycline LAb	48 (98)	23 (46)	19 (38)	10.0 (21)	52 (105)
Cow oxytetetrcycline SAc	97 (197)	2.0 (4)	1.0 (2)	0.0 (0)	3.0 (6)
Cow tetracycline bolus	98 (199)	1.0 (2)	1.0 (2)	0.0 (0)	2.0 (4)
Cow LAb penicillin	79 (160)	13 (26)	5.4 (11)	3.0 (6)	21 (43)
Cow SAc penicillin	89 (180)	6.9 (14)	3.0 (6)	1.5 (3)	11 (23)
Cow tilmicosin	92 (187)	7.4 (15)	0.5 (1)	0.0 (0)	7.9 (16)
Cow trimethoprim/sulphadiazine	95 (192)	4.9 (10)	0.0 (0)	0.5 (1)	5.4 (11)
Cow oral sulphonamides	97 (197)	2.5 (5)	0.5 (1)	0.0 (0)	3.0 (6)
Cow florfenicol	96 (194)	3.9 (8)	0.5 (1)	0.0 (0)	4.4 (9)
Cow sulbactam-ampicillin injectable	97 (197)	0.5 (1)	0.0 (0)	2.5 (5)	3.0 (6)
Cow ceftiofur	99 (200)	1.5 (3)	0.0 (0)	0.0 (0)	1.5 (3)
Cow spectinomycin hydrochloride	100 (202)	0.5 (1)	0.0 (0)	0.0 (0)	0.5 (1)
Cow dihydrostreptomycin	100 (202)	0.5 (1)	0.0 (0)	0.0 (0)	0.5 (1)
Cow amprolium hydrochloride oral	100 (202)	0.5 (1)	0.0 (0)	0.0 (0)	0.5 (1)
Cow novobiocin/penicillin G intramammary	98 (199)	1.0 (2)	0.5 (1)	0.5 (1)	2.0 (4)
Cow cephapirin sodium intramammary	99 (200)	1.0 (2)	0.0 (0)	0.5 (1)	1.5 (3)

^aTotal number of herds enrolled, N = 203.

^bLA = long acting.

^cSA = short acting.