Comparing methods for catching and crating broiler chicken flocks: A trade-off between animal welfare, ergonomics and economics

Abstract

Catching, carrying, and loading of broilers before transport to the slaughterhouse causes stress. In this study three catching methods (two manual (inverted, upright) and one mechanical) were compared using a cost-benefit analysis of animal welfare, ergonomics and economic analysis. Depopulation of approximately 5,000 broilers per catching method per flock (upright vs. inverted vs. mechanical: n=3; upright vs. inverted: n=9; inverted vs. mechanical: n=3 flocks) was analyzed on 15 commercial farms. Economic considerations (person-hours per 1,000 chickens), ergonomics (catcher survey, ergonomic assessment of simulated catching), and animal welfare on-farm (wing flapping frequency, catcher-bird interaction) and at the slaughterhouse (catch damage and DOA prevalence) were considered. Wing flapping frequency was lower (2.0 ± 0.1 vs. 5.4 ± 0.1, P < 0.001), and catcher-bird interaction was better (3.7 ± 0.2 vs. 4.4 ± 0.2, P < 0.01) for upright catching compared to inverted catching based on a 7-point Likert scale. Prevalence of catch damage was lower for upright versus mechanical catching (15.5 ± 1.3% vs. 17.7 ± 1.4%, P = 0.046). More person-hours per 1,000 broilers were required for upright versus inverted (1.6 ± 0.1 h vs. 1.0 ± 0.1 h) and mechanical catching (0.6 ± 0.3 h) (P < 0.001). Upright catching was 1.5 and 1.2 times more expensive than inverted and mechanical catching based on 20,000 broilers. Compared to inverted catching, fair compensation would increase by €0.012 (upright) and €0.006 (mechanical) per kg of live weight. An ergonomics expert rated manual catching as very demanding, but catchers (n = 16) disliked upright catching (more labor-intensive). This study revealed animal welfare benefits of upright versus inverted (less wing flapping, better catcher-bird interaction) and mechanical catching (less catch damage), whereas mechanical catching provided the best labor conditions. Widespread application of upright catching would require testing of entire flocks and collaboration with the poultry sector to determine fair compensation, improve labor conditions and identify strategies to minimize catch and load duration.