Table 7 For high prolific sows^a, estimates of fixed factors and random effect variance included in the final linear mixed effects models for number of piglets born alive and for piglets weaned

Intercept

12.31 (0.20)

<  0.01

9.35 (0.15)

<  0.01

Farm groups^d

<  0.01

<  0.01

 High-performing (HP) farms

1.00 (0.22)

1.64 (0.18)

 Intermediate-performing (IP) farms

0.38 (0.22)

0.95 (0.17)

Parity groups (Py)

<  0.01

<  0.01

 1

3.32 (0.20)

0.96 (0.14)

 2

0.01 (0.20)

0.64 (0.15)

 3

0.41 (0.21)

0.61 (0.15)

 4

0.52 (0.21)

0.55 (0.15)

 5

0.21 (0.21)

0.53 (0.16)

Farm x Py

<  0.01

<  0.01

 HP farms x Py 1

- 0.81 (0.21)

- 0.62 (0.15)

 HP farms x Py 2

- 0.25 (0.21)

- 0.25 (0.15)

 HP farms x Py 3

- 0.05 (0.22)

- 0.28 (0.16)

 HP farms x Py 4

- 0.07 (0.22)

- 0.38 (0.16)

 HP farms x Py 5

0.07 (0.22)

- 0.47 (0.16)

 IP farms x Py 1

- 0.24 (0.22)

- 0.36 (0.16)

 IP farms x Py 2

- 0.04 (0.22)

- 0.17 (0.16)

 IP farms x Py 3

0.01 (0.23)

- 0.30 (0.16)

 IP farms x Py 4

- 0.24 (0.23)

- 0.36 (0.17)

 IP farms x Py 5

- 0.11 (0.23)

- 0.37 (0.17)

Intercept variance at farm level

0.19 (0.04)

–

0.18 (0.03)

–

Intercept variance at sow level

0.12 (0.01)

–

0.07 (0.01)

–

ICC (records within the same farm), %

2.4

–

4.3

–

ICC (records within the same sow), %

4.0

–

6.0

–