Table 4

Univariable analysis of risk factors associated with SCM in lactating cow on herds in the Savannah region of Nigeria
Variable OR (crude) SE z Pvalue 95 % CI
Quarter 0.918 0.048 −1.65 0.100 0.828; 1.016
Month 1.223 0.098 2.52 0.012 1.046; 1.430
Herd size 0.910 0.002 −0.31 0.758 0.996; 1.003
Management system 1.254 0.150 1.89 0.059 0.992; 1.585
Breed 1.241 0.094 2.85 0.004 1.069; 1.439
Cow type 1.333 0.159 2.40 0.016 1.054; 1.685
Cow origin 0.987 0.115 −0.11 0.914 0.785; 1.241
Age (years) 2.041 0.243 5.99 <0.001 1.616; 2.577
Parity 2.081 0.271 5.62 <0.001 1.611; 2.686
BCS 0.999 0.069 −0.01 0.991 0.873; 1.144
Washing of teat 0.755 0.100 −2.11 0.035 0.582; 0.980
Pre-striping before milking 0.359 0.155 −2.37 0.018 0.154; 0.836
Washing hands before milking 0.314 0.085 −4.28 <0.001 0.184; 0.533
Heifer and cow 0.245 0.121 −2.86 0.004 0.093; 0.643
Replacement heifers 0.926 0.130 −0.55 0.584 0.703; 1.219
Feeding after milking 2.787 1.203 2.37 0.018 1.196; 6.496

*Associations were evaluated by obtaining a crude OR estimate; variables with values of P ≤ 0.20 were considered significant and included in subsequent multivariable analysis; SCM = sub-clinical mastitis.

Shittu et al.

Shittu et al. BMC Veterinary Research 2012 8:134   doi:10.1186/1746-6148-8-134

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