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. 2016 May 21;58:31. doi: 10.1186/s13028-016-0213-8

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© Andersson et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Predicted stayability and litter size in first parity. Predicted probability (with 95 % CI) of a sow producing ≥4 litters in her lifetime (y-axis) versus the total number of piglets born in her first parity litter (x-axis). Predictions are from multivariable logistic regression including number of piglets, birth year of the sow, age at first farrowing and season at first farrowing as explanatory variables and herd included as a random variable. Data were selected from January 1 1997 to December 31 2009 from 24 Swedish piglet producing herds and included 38,346 observations