Table 8.

Decision making on antimicrobial drugs (AMD) purchased and used to treat sick calves on California dairies.

Person making decision	Percent	SE	N	95% Confidence limits
				Lower	Upper
Purchase of AMD added in feed*
Owner	69.35	5.9	63	56.5	79.77
Veterinarian	49.2	6.35	63	36.83	61.68
Herd manager	25.4	5.53	63	15.97	37.89
Calf manager	20.63	5.14	63	12.19	32.75
Nutritionist	3.17	2.22	63	0.76	12.24
Purchase Injectable or oral AMD*
Owner	65.67	5.84	67	53.27	76.25
Veterinarian	46.27	6.14	67	34.47	58.5
Herd manager	31.34	5.71	67	21.18	43.68
Calf manager	25.37	5.36	67	16.2	37.42
Nutritionist	1.49	1.49	67	0.2	10.31
Othera	1.49	1.49	67	0.2	10.31
Treatment of preweaned calves on 1st day of illness*
Owner	50.06	6.16	66	43.65	67.76
Veterinarian	28.79	5.62	66	18.96	41.13
Herd manager	21.21	5.07	66	12.81	33.04
Calf manager	45.45	6.18	66	33.63	57.81
Nutritionist	0
Otherb	1.52	1.52	66	0.2	10.47

The dairy owner and the veterinarian were reported to play a major role in deciding on which AMD are purchased and stocked on the dairy, as well as the choice of the AMD used to treat calves on the 1st day of illness. N, total number of respondents who answered the specific question.

^*Some respondents chose more than one option.

^aSon of calf-feeder.

^bCalf-feeder.