Seems net-neg. Research here using 10 commercial farms who each kept a flock of beak-trimmed hens and non-beak-trimmed hens.
“omitting beak trimming had negative consequences for the condition of plumage, skin, and keel bone, and tended to increase mortality, highlighting the risk of reduced welfare when keeping layers with intact beaks.”
Seems net-neg. Research here using 10 commercial farms who each kept a flock of beak-trimmed hens and non-beak-trimmed hens.
“omitting beak trimming had negative consequences for the condition of plumage, skin, and keel bone, and tended to increase mortality, highlighting the risk of reduced welfare when keeping layers with intact beaks.”