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Table 3 Multilevel regression of feed conversion efficiency in pigs infected with influenza A(H1N1)pdm09 virus

From: Adverse effects of Influenza A(H1N1)pdm09 virus infection on growth performance of Norwegian pigs - a longitudinal study at a boar testing station

Feed Conversion Efficiency (FCE)

Predictors

Coefficients

SE

P value

95% CI

Breed

     

Landrace

Reference

    

Duroc

0.0426

0.010

<0.001

0.0230

0.0622

Growth phase

     

GF1(33_60 kg)

Reference

    

GF2(61_80 kg)

0.2865

0.011

<0.001

0.26

0.31

GF3(81_100 kg)

0.5442

0.014

<0.001

0.52

0.57

Birthdate

-0.0002

0.00001

<0.001

-0.0002

-0.0001

Average daily feed intake

0.0238

0.010

0.019

0.004

0.044

Interaction term: INGP*GF

   

SERONEG*GF(1-3)

Reference

    

SEROPOS*GF1

-0.015

0.011

0.159

-0.037

0.006

SEROPOS*GF2

0.002

0.010

0.849

-0.018

0.022

SEROPOS*GF3

0.029

0.010

0.004

0.010

0.049

VIR1*GF1

-0.001

0.023

0.951

-0.046

0.043

VIR1*GF2

0.058

0.020

0.004

0.018

0.097

VIR1*GF3

0.125

0.020

<0.001

0.086

0.165

VIR2*GF1

-0.049

0.037

0.189

-0.121

0.024

VIR2*GF2

0.122

0.036

0.001

0.051

0.192

VIR2*GF3

0.033

0.036

0.361

-0.038

0.103

VIR3*GF1

-0.016

0.037

0.659

-0.089

0.056

VIR3*GF2

0.045

0.035

0.196

-0.023

0.112

VIR3*GF3

0.091

0.035

0.008

0.023

0.159

Constant (β 0 )

4.6609

0.1934

<0.001

4.282

5.040

  1. Abbreviations: SERONEG Seronegative pigs, SEROPOS Seropositive pigs (not tested for virus), VIR1 pigs viral positive between bodyweight 33 kg and 60 kg, VIR2 pigs viral positive between bodyweight 61 kg and 80 kg, VIR3 pigs viral positive between bodyweight 81 kg and 100 kg. The model is hierarchical with three levels; observations (n = 5865); pig (n = 1955) and herd (n = 43). *denotes interaction term.