Variable

Stratum

Estimate

Difference

SE^*

P^**

Constant

4982.05

193.40

<0.0001

AFC (months)

<26

4817.36

−354.78

46.50

<0.0001

26 - 33.6

5066.54

−105.60

41.87

0.0117

>33.6

5172.14

0

0

0

Zone^***

LM-wf

5432.86

1311.38

175.72

<0.0001

P-wf

5393.09

1271.61

169.17

<0.0001

P-vwf

4650.61

529.13

179.00

0.0031

T-vwf

5264.67

1143.18

167.29

<0.0001

LM-rf

4703.54

582.06

169.24

0.0006

P-rf

5564.53

1443.04

172.42

<0.0001

M-vwf

4121.48

0

0

0

Type of parturition^****

Normal

5058.29

79.21

53.95

0.1421

Distocic

4979.08

0

0

0

Without RFM

5115.72

194.08

81.13

0.0168

With RFM

4921.64

0

0

0

First lactation length

<256

3648.58

−2281.33

40.85

<0.0001

(days)

256 - 375

5477.55

−452.36

27.51

<0.0001

>375

5929.91

0

0

0

Inbreeding coefficient

<6.25%

5086.16

134.94

57.7

0.0196

≥6.25%

4951.20

0

0

0