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. 2019 May 20;13(11):2612–2620. doi: 10.1017/S1751731119000661

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© The Animal Consortium 2019

This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits noncommercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.

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(a) Conventional pen with farrowing crate (FC); (b) Single loose housing (LH) pen; (c) Group-housing system for lactating sows (GH). CoA = common area. © Big Dutchman; CrA = creep area; Sw = swing gate.