Skip to main content

Advertisement

Table 4 Multivariate Cox proportional hazards model for pregnancy rate using detection of lameness before and after ESD as time dependent variables. Farm is included as a cluster effect in the analysis. There were no significant interactions in the model

From: The effect of Lameness before and during the breeding season on fertility in 10 pasture-based Irish dairy herds

Variable N Coefficient (SE) P-value Hazard ratio (95 % CI)
Lameness detection group     
NN 612    1.00
YN 47 −0.13 (0.17) >0.05 0.88 (0.62 – 1.29)
NY 69 −0.42 (0.15) <0.01 0.65 (0.52 – 0.81)
YY 43 −0.46 (0.19) <0.05 0.62 (0.42 – 0.93)
BCS at Calving     
≤2.75 162    1.00
3.0 314 0.25 (0.13) <0.05 1.28 (1.01 – 1.64)
3.25 243 0.44 (0.15) <0.01 1.55 (1.15 – 2.07)
≥3.5 52 0.41 (0.23) >0.05 1.51 (0.96 – 2.36)
Max BCS loss after Calving     
0 143    1.00
0.25 315 −0.41 (0.12) <0.01 0.66 (0.52 – 0.85)
0.5 252 −0.53 (0.14) <0.01 0.59 (0.44 – 0.78)
>0.5 61 −1.0 (0.23) <0.01 0.37 (0.23 – 0.57)
Month of Calving     
Jan/Feb 457    1.00
March 206 −0.33 (0.10) <0.01 0.72 (0.60 – 0.86)
Apr/May 108 −0.69 (0.15) <0.01 0.50 (0.37 – 0.68)
EBI overall (€) 771 0.01 (0.001) <0.01 1.00 (1.00 – 1.01)