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. 2022 Dec 30;13(1):143. doi: 10.3390/ani13010143

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Effect on aggression using different types of enrichment. Note, this includes experiments where either one specific enrichment is used, or when several enrichments are used in combination. In the figure, the category other (11 observations) is excluded due to the variation of enrichments included in that category. Gnawing device is excluded due to a low number of observations (2). Four observations with different outcomes, dependent on the method used to measure aggression, are also excluded.