Bovine mastitis: prevalence, risk factors and isolation of Staphylococcus aureus in dairy herds at Hawassa milk shed, South Ethiopia

Table 4 Univariable logistic regression analysis of the association of cow-level mastitis with different risk factors

Variable	Number	No. pos	Prevalence (%)	p
Management type				<0.001
Semi-intensive	200	92	46.0
Intensive	329	239	72.6
Herd size				<0.001
≤ 10	200	92	46.0
> 10	329	239	72.6
Bedding material				<0.001
Yes	145	61	42.1
No	384	270	70.3
Udder washing				0.707
Whole udder	291	180	61.9
Teats only	238	151	63.5
Udder drying after washing				0.774
Yes	295	183	62.0
No	234	148	63.3
Milking mastitic cow last				0.001
Yes	202	109	54.0
No	327	222	67.9
Breed				<0.001
Local	83	33	39.8
Cross	446	298	66.8
Age				<0.001
≤ 5 years	227	85	37.4
> 5 years	302	246	81.5
Parity				<0.001
1	66	17	25.8
2	145	60	41.4
3	115	75	65.2
≥ 4	203	179	88.2
Stage of lactation				<0.001
1 – 2 months	198	158	79.8
3 – 6 months	186	80	43.0
≥ 7 months	145	93	64.1
Udder & leg hygiene score				<0.001
Slightly dirty	241	120	49.8
Moderately dirty	203	136	67.0
Very dirty	85	75	88.2
Udder position				<0.001
Normal	315	162	51.4
Pendulous	214	169	79.0
Teat end shape				<0.001
Pointed	175	74	42.3
Round	197	126	64.0
Flat	157	131	83.4
History of mastitis				0.174
No	189	111	58.7
Yes	340	220	64.7

ISSN: 1746-6148