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Table 4 Parameter estimates for the final generalised linear mixed model for the individual animal risk of repeat breeder.

From: Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle

Variable β ORa (95% confidence intervals)
Intercept -3.034 n.a.b
FCM23c -0.030 1.28 (1.20–1.36)
Lactation number:   
   1 -1.375 n.a.
   2 -0.629 n.a.
   3+ 0 n.a.
Parturition   
   Normal or not known -0.119 0.89 (0.69–1.14)
   Difficult or dystocia -0.301 1.35 (1.00–1.82)
   Twins (normal parturition) 0 1
Season at 1st service:   
   January -0.177 1.19 (1.07–1.33)
   February-March -0.035 0.97 (0.88–1.06)
   April-September -0.259 0.77 (0.70–0.85)
   October-December 0 1
RB in previous lactation:   
   No -1.084 n.a.
   Yes -1.414 n.a.
   not known 0 n.a.
Days in milk at 1st serviced -0.016 0.62 (0.59–0.66)
Veterinary treated e case of reproductive disorder   
   Yes -0.254 1.29 (1.09–1.52)
   No 0 1
Interaction lactation number*RB in previous lactation   
   1 No -1.145 3.72 (2.65–5.23)
   1 Yes -1.270 4.57 (2.84–7.34)
   1 not known 0 3.96 (2.76–5.67)
   2 No -0.631 2.95 (2.10–4.14)
   2 Yes -0.699 3.84 (2.54–5.80)
   2 not known 0 1.88 (1.22–2.88)
   3+ No 0 2.96 (2.11–4.14)
   3+ Yes 0 4.11 (2.76–6.14)
   3+ not known 0 1
  1. a Odds ratio
  2. b not applicable
  3. c Average of daily fat-corrected milk yield recorded at 2nd and 3rd official test-month after calving; OR evaluated at an interquartile range of 8 kg
  4. d OR evaluated at an interquartile range of 30 days
  5. e Only treatments occurring before 1st service