Beak trimming in laying hens reduces feather pecking but causes welfare harm that reduction and alternatives are addressing.
Beak trimming causes acute pain and potential chronic neuropathic pain from severing neural tissue. The justification is reduction of feather pecking in crowded systems. However, enriched environments that address the root causes of feather pecking reduce the incidence below levels requiring trimming. Reform is moving toward elimination of trimming through environmental enrichment rather than just improving the trimming method.