Prevalence of bovine subclinical mastitis and isolation of its major causes in Bishoftu Town, Ethiopia

BMC Research Notes

Table 1 Association of different factors with subclinical mastitis

Risk factors	Number of cows examined	CMT			Bacteriology
Risk factors	Number of cows examined	Number positive	Mean and 95% CI	p-value	Number positive	Mean and 95% CI	p-value
Body condition score
Poor	7	3	42.9 (0–92.3)	0.92	3	42.1 (28.9–55.3)	0.78
Medium	198	78	39.4 (32.5–46.3)		74	37.4 (30.6–44.2)
Good	57	24	42.1 (28.9–55.3)		24	42.1 (28.9–55.3)
Milk yield (liters)
≥ 15	106	39	36.8 (27.5–46.1)	0.37	36	33.9 (24.8–43.1)	0.21
< 15	156	66	42.3 (34.5–50.1)	0.37	65	41.7 (33.8–49.5)	0.21
Age (years)
[2–6)	163	51	31.3 (24.1–38.5)	0.001	49	30 (22.9–37.2)	0.001
[6–9)	81	41	50.6 (39.5–61.7)		39	48.1 (37.0–59.3)
≥ 9	18	13	72.2 (49.3–95.1)		13	72.2 (49.3–95.1)
Number of parity
1–3	204	68	33.3 (26.8–39.8)	0.001	65	31.9 (25.4–38.3)	0.001
4–6	53	32	60.4 (46.8–73.9)		31	58.5 (44.8–72.2)
≥ 7	5	5	100		5	100

Keys: [for value included into the range,) for value not included into the range

ISSN: 1756-0500