Reported highest observed disease incidence by cow parity, stage of lactation and stage of calving season presented by herd size and calving pattern (% of respondents to a transition period survey in Ireland).

<p><sup>a</sup>Herds were categorized by herd size (large: >150 cows, above average: 100–150 cows, average: 60–100 cows, or small: <60 cows) using the Irish national dairy herd average as reference (93 cows; [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0314987#pone.0314987.ref009" target="_blank">9</a>]), and by calving pattern (spring-calving: cows calving in spring, or split-calving: cows calving in spring and autumn). <sup>b</sup>Stages of lactation: Fresh calver: First 3 weeks after calving, early lactation: from week 3 to end of 3<sup>rd</sup> month of lactation, mid lactation: from start of 4<sup>th</sup> month to end of 7<sup>th</sup> month of lactation, late lactation: from start of 8<sup>th</sup> month of lactation to dry-off, far-off dry: from dry-off to close-up, close-up dry: last 3 weeks of pregnancy.</p> <p>(DOCX)</p>