Table 1.

Individual therapeutic antibiotic treatments administered to members of the studied herd of 763 cattle

Mo and yr	No. of injections of indicated antibiotic(s)a								Total no. of antibiotic injections	No. of animals injected with antibiotics
	Ceftiofur	Cloxacillin and oxytetracycline	Enrofloxacin	Florfenicol	Florfenicol and sulfadimethoxine	Oxytetracycline	Penicillin G	Tulathromycin
March 2009	0	0	0	0	0	0	0	0	0	0
April 2009	0	1	0	1	0	0	0	0	2	2
May 2009	0	0	0	0	0	0	0	0	0	0
June 2009	1	0	0	0	1	0	0	0	2	2
July 2009	3	10	0	3	1	2	0	0	19	18b
August 2009	6	4	0	0	0	0	0	0	10	10
September 2009	10	8	0	0	0	3	2	0	23	23
October 2009	52	0	0	0	0	1	0	0	53	51c
November 2009	14	0	0	0	0	1	0	1	16	15d
December 2009	4	0	1	1	0	0	0	0	6	6
January 2010	0	0	0	0	0	5	0	0	5	5
February 2010	6	0	0	0	0	0	0	0	6	6
March 2010	3	0	0	0	0	0	0	0	3	3
April 2010	1	0	0	0	0	0	0	0	1	1
May 2010	3	0	0	0	0	0	0	1	4	4
June 2010	3	0	0	0	0	0	0	0	3	3
July 2010	4	0	0	0	0	0	0	0	4	4
Total over life spans of herd cattle (March 2009 to July 2010)	110	23	1	5	2	12	2	2	157	137e

^aTwo antibiotics listed in the same column indicate injection of the same animal with both antibiotics simultaneously.

^bIn July 2009 an animal was injected with ceftiofur and then 3 days latter injected with oxytetracycline.

^cTwo animals each received two ceftiofur injections in October 2009.

^dOne animal received two ceftiofur injections in November 2009.

^eOne hundred thirty-seven cattle were injected with antibiotics, 16 cattle were injected with antibiotics on more than one occasion.