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. 2019 Jul 3;5(4):500–507. doi: 10.1002/vms3.184

Figure 3.

Figure 3

Pecking stones and alfalfa bales are frequently used enrichment materials in chicks (a), pullets and laying hens (b). However, consistent results have not been found regarding the effects of these enrichment materials on the occurrence of feather pecking in housing systems with litter (see Table 1)