Positive Effects of Elevated Platforms and Straw Bales on the Welfare of Fast-Growing Broiler Chickens Reared at Two Different Stocking Densities.

Frédérique Mocz,Virginie Michel,Mathilde Janvrot,Maryse Guinebretière,Jean-Philippe Moysan,Alassane Keita,Anja B Riber

doi:10.3390/ani12050542

Abstract

Simple SummaryFast-growing broiler chickens commonly experience welfare issues, such as foot and hock lesions or walking difficulties due to their genetics or the barren environment. This study assessed the impacts of elevated platforms and straw bales on the welfare of fast-growing broilers reared at two different stocking densities. The higher stocking density had negative impacts on foot and hock lesions and walking ability, whereas these welfare issues were partly positively affected by enrichments at both stocking densities.In conventional rearing systems, fast-growing broiler chickens commonly experience welfare issues, such as contact dermatitis, walking difficulties or a lack of expression of species-specific behaviours. Enriching their environment may be a way to improve their welfare. The objective of this study was to evaluate the benefits of elevated platforms and straw bales on the welfare of fast-growing broiler chickens reared at two different stocking densities. A total of 14,994 Ross 308 broilers were housed in 12 pens according to 4 treatments: 31 kg/m2 with or without enrichments and 41 kg/m2 with or without enrichments. The broilers’ walking ability, footpad dermatitis (FPD), hock burns (HB), weight, mortality and litter quality were assessed. Stocking density had a negative effect on FPD and HB, whereas enrichments reduced the occurrence of FPD and HB at both densities. There was a positive enrichment effect and a negative density effect on body weight at 25 days and on walking ability, but no effect on the litter quality or mortality rate. These results confirm that an enriched environment improves animal welfare in confined chickens, regardless of the stocking density. Reducing stocking density clearly appears to be an important means of increasing animal welfare.

Highlights

Rearing fast-growing broiler chickens in conventional systems is commonly associated with welfare issues, such as lameness, footpad dermatitis or a lack of expression of speciesspecific behaviour [1]
There was an effect of enrichment (p = 0.01) and of density (p = 0.05) on the body weight assessed at 25 days of age
There was an effect of enrichments in broilers housed at 31 kg/m2 but not in birds rearedThaet r4e1wkags/man2. eAffte3c1t okfg/emnr2icwhimtheonuttseinnrbicrhomileernstsh,omusoerde baitr3d1s khga/dmse2vbeuret nfooottipnabdirled-s srieoanrsed(scaotr4e1ck) g(p/m< 02..0A00t13)1ankdg/fmew2ewr ihthadoumt iennorricfhomotepnatds,dmeromreatbiitrisds(shcoardesbe)v(epre

Summary

Introduction

Rearing fast-growing broiler chickens in conventional systems is commonly associated with welfare issues, such as lameness, footpad dermatitis or a lack of expression of speciesspecific behaviour [1]. Enriching the environment could improve rearing conditions and broiler welfare. Elevated platforms seem to be more suitable than perches for fast-growing broiler chickens due to the broilers’ weight, leg weakness and difficulties in finding their balance on “traditional” perches like bars [3]. These studies assessed several parameters, such as economics [13], health [14] and animal welfare [8,15,16,17]. The outcomes of these studies are sometimes contradictory [3], but for the studies where only a limited improvement was found in animal welfare, it may be explained by an insufficient platform surface area [5], late provision (after 7 days old) [5] or lack of access ramps [5,6]

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