Hen beak-trimming review finds uncertain mortality and welfare results
The overall hot-blade mortality estimate was not statistically significant, while trimming-depth analyses reported reductions. Evidence on egg production and corticosterone remained inconsistent.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
This animal research review assessed mortality, egg production, feather pecking, and corticosterone after beak trimming. The overall hot-blade analysis did not establish a statistically significant mortality reduction, although analyses grouped by trimming depth reported reductions. Findings for egg production and corticosterone were inconsistent, leaving uncertainty about performance and physiological welfare effects.
This abstract-based account has limited quantitative detail on infrared trimming. Results varied substantially across the hot-blade mortality studies, while few studies and methodological differences limited interpretation of egg production and corticosterone findings.
What researchers found
Mortality after hot-blade trimming
Estimated mortality risk was 0.47 times that in untrimmed hens—a lower relative risk, not an absolute risk reduction. The result was not statistically significant. Follow-up duration was not reported.
Separate analyses
The abstract reports mortality reductions within both shallow and deep trimming categories. These separate analyses do not resolve the uncertainty in the overall hot-blade estimate or establish which trimming depth is preferable.
Unresolved welfare questions
The authors describe infrared trimming favorably, but the abstract supplies no corresponding effect estimate. Inconsistent corticosterone findings also do not demonstrate that physiological stress stays unchanged after trimming.
The original publication
Productive and welfare parameters in trimmed laying hens: A systematic review-meta-analysis.
Gallina HS, Canozzi MEA, Molinari PV et al.
Res Vet Sci · 2025
- PubMed ID
- 40914139
- Record checked
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