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Table 3 Model selection for two-level mixed-effects log-binomial regression models for served gilts

From: Culling in served females and farrowed sows at consecutive parities in Spanish pig herds

 

Model specification

pseudo-AIC

Model for culling risk of served gilts

 
 

Fixed effecta,b

Random effect

Parity

Model No.

AFS

HG

Interaction

Herds

0

AFS × HG

1

  

39187c

2

 

 

41,896

3

NC

4

 

39,189

COVTEST for final Model

 

<0.01

  1. AFS age at first-service, HG herd groups
  2. aEntry years were included into all models
  3. bThe univariate models were not shown because the AIC were higher than those shown in Models 1 and 2
  4. cFinal model is selected by the lowest pseudo-AIC
  5. NC means the models did not converge