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. 2020 Aug 7;99(11):5184–5196. doi: 10.1016/j.psj.2020.07.013

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© 2020 Published by Elsevier Inc. on behalf of Poultry Science Association Inc.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Distribution of the skin injury scores during the laying period in (A) brown-egg layers and (B) white-egg layers over time, as well as in (C) both genetic strains in their 48th week of age, depending on the supply of enrichment materials (alfalfa bales and pecking stones). Different indices (a, b) indicate statistically significant differences between the study groups within a genetic strain. V1 (−/−), variant 1 (no additional enrichment materials supplied over the whole study period); V2 (+/−), variant 2 (rearing period with and laying period without supply of additional enrichment materials); V3 (−/+), variant 3 (rearing period without and laying period with supply of additional enrichment materials; V4 (+/+), variant 4 (supply of additional enrichment materials over the whole study period). Abbreviation: WA, week of age.

Distribution of the skin injury scores during the laying period in (A) brown-egg layers and (B) white-egg layers over time, as well as in (C) both genetic strains in their 48th week of age, depending on the supply of enrichment materials (alfalfa bales and pecking stones). Different indices (a, b) indicate statistically significant differences between the study groups within a genetic strain. V1 (−/−), variant 1 (no additional enrichment materials supplied over the whole study period); V2 (+/−), variant 2 (rearing period with and laying period without supply of additional enrichment materials); V3 (−/+), variant 3 (rearing period without and laying period with supply of additional enrichment materials; V4 (+/+), variant 4 (supply of additional enrichment materials over the whole study period). Abbreviation: WA, week of age.