Laying Hen Flock Mortality Across Housing Systems

Ten studies contributed data on 3,851 laying hen flocks to analyze mortality variation. The meta-analysis models cumulative mortality by age, breed, and housing system, with most data from 2,823 free-range flocks. It identifies relationships between mortality, beak trimming status, and environmental impacts like greenhouse gas emissions.

Use Cases

• Model the curvilinear increase in cumulative mortality with flock age across seven breed categories.
• Compare mortality levels between cage, loose, and free-range housing systems using producer-recorded data.
• Assess the impact of beak trimming status (intact vs. trimmed) on flock cumulative mortality.
• Estimate potential reductions in greenhouse gas emissions by lowering mortality to 1st quartile levels.
• Analyze the range of cumulative mortality (0% to 69.3%) reported for free-range flocks at 60-80 weeks of age.

Strengths

• Data aggregates records from 3,851 individual flocks across ten independent studies.
• Focuses on 2,823 free-range flocks, providing substantial sample size for that housing system.
• Analysis includes specific, reported metrics like a 10% average cumulative mortality at 60-80 weeks.

Limitations

• The dataset is a meta-analysis of aggregated study results, not raw, row-level flock records.
• Specific causes of mortality are not detailed, limiting etiological investigation.
• Geographic scope and time range of the underlying studies are not specified.

Provenance

Source

Dryad digital repository.

Collection Method

Meta-analysis combining data from ten previously published studies.

Time Range

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Freshness

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Geography

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