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Table 4 Estimates (standard error: SE) and P-values of piglets born alive and sow herd size group in the mixed-effects model for age of piglet death in 91 herds

From: A 10-year trend in piglet pre-weaning mortality in breeding herds associated with sow herd size and number of piglets born alive

Effects

Ages of piglets died (%)

Estimate (SE)

P-value

Intercept (SE)a

0.4731 (0.4417)

0.26

Piglets born alive

− 0.3351 (0.2121)

0.10

Piglets born alive squared

−0.0955 (0.0402)

0.02

Sow herd size group

−0.0762 (0.4710)

0.87

Sow herd size group x Piglets born alive

−0.0347 (0.1430)

0.80

Year

0.3585 (0.0879)

<  0.01

Year x Year

−0.0170 (0.0053)

<  0.01

Year x Piglets born alive

0.1220 (0.0245)

< 0.01

Year x Sow herd size group

0.0061 (0.0570)

0.90

Stillborn piglets

−0.8707 (0.3640)

0.92

Piglets born alive x Stillborn piglets

−0.8851 (0.7457)

0.16

Year x Stillborn piglets

−0.0491 (0.0551)

0.37

Sow herd size group x Stillborn piglets

0.2414 (0.3146)

0.44

  1. aSEs were obtained from the statistical model