Skip to main content

Table 2 Significant associations between independent and dependant variables (Model 1: Yes versus No)

From: A survey of management practices on Irish dairy farms with emphasis on risk factors for Johne’s disease transmission

Dependent variable Odds ratio Pvalue Conf. interval (95%)
  Independent Variable
Is the CA overcrowded?
  >99 cows vs. 66–99 cows 5.0 0.001 1.9, 13.0
  >99 cows vs. 31–65 cows 7.8 <0.001 2.6, 23.6
Do new born calves stay in CA for more than six hours?
  31-65 cows vs. >99 cows 3.1 0.009 0.1, 0.8
  Non-spring >99cows vs. spring 31–65 cows 28.1 0.016 1.9, 421.4
Is the CA cleaned and bedded between every calving?
  31-65 cows vs. >99 cows 3.6 0.001 0.1, 0.6
Are heifer calves fed pooled colostrum?
  66-99 cows vs. 31–65 cows 2.2 0.039 1.0, 4.5
  >99 cows vs. 31–65 cows 4.8 <0.001 2.3, 9.9
  >99 cows vs. 66–99 cows 2.2 0.024 1.1, 4.4
Is colostrum collected without teat disinfection?
  Mixed enterprise vs. Dairy only 1.8 0.049 0.3, 0.9
Are heifer calves fed waste milk from sick cows?
  Mixed enterprise vs. Dairy only 2.2 0.009 1.2, 3.9
Do calves have direct contact with cows/ manure pre entering milking herd?
  Non-dairy dense vs. Dairy dense 2.5 0.034 0.2, 0.9
Do heifers have direct contact with cows/ manure pre entering milking herd?
  >99 cows vs. 66–99 cows 2.5 0.019 1.2, 5.2
Do heifers have access to pasture spread with cow slurry?
  >99 cows vs. 66–99 cows 7.5 0.028 0.1, 0.9
  1. P Value: Significant P <0.05. CA: calving area.