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. 2020 Aug 18;98(Suppl 1):S36–S51. doi: 10.1093/jas/skaa145

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© The Author(s) 2020. Published by Oxford University Press on behalf of the American Society of Animal Science.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — The number of studies assessing KBF (total of 88 studies) published over the last 30 yr (1989 to 2018). Scientific and regulatory milestones discussing the improvement of poultry welfare are indicated with arrows.