Herd A | |||||||||

Age (weeks) | a | b | c | d | P value | a–c (NV) | b–d (V) | P* value | |

Weaning | 3 | 25.4 (15/59) | 14.9 (10/67) | 14.7 (9/61) | 13.3 (8/60) | 0.277 | 20.0 (24/120) | 14.2 (18/127) | 0.225 |

Nursery period | 4 | 12.5 (7/56) | 0.0 (0/66) | 1.7 (1/59) | 1.8 (1/57) | 0.088 | 7.0 (8/115)^{A} | 0.8 (1/123)^{B} | 0.039 |

Herd B | |||||||||

Age (weeks) | a | b | c | d | P value | a–c (NV) | b–d (V) | P* value | |

Weaning | 4 | 0.0 (0/65) | 0.0 (0/57) | 1.6 (1/61) | 1.7 (1/58) | 0.997 | 0.8 (1/126) | 0.9 (1/115) | 0.948 |

Nursery period | 5 | 3.1 (2/64) | 1.8 (1/55) | 1.7 (1/58) | 1.8 (1/55) | 0.943 | 2.5 (3/122) | 1.8 (2/110) | 0.738 |

Vaccination status: NV (pigs originating from non-vaccinated sow farrowing batches) and V (pigs originating from vaccinated sow farrowing batches). The P value refers to the comparisons between the individual farrowing batches, and the P* value to the comparisons between the summaries of the NV (a–c) and V (b–d) batches. Values with different superscripts within a row are significantly different (P<0.05).