| Description: |
Stocking density, space availability, and lameness are important aspects affecting broiler chicken behavior and welfare. Stocking density refers to the weight of broiler chickens per a set area of space typically measured as kg/m2. Space availability is the amount of space per individual broiler chicken typically measured as m2/bird. Stocking density and space availability can contribute to lameness and other aspects of welfare such as footpad dermatitis, hock burn, and feather cleanliness. The behavior of broiler chickens can also be modified by stocking density, space availability, and lameness. All of these aspects are typically related to a change in activity levels which could be used as an indicator of animal welfare. To date, the majority of research that has examined the walking ability of broiler chickens has assessed how stocking density influences the development of gait problems when applied during the grower phase. However, not all broilers develop gait problems at the same point in time and it is unknown whether broilers that initially have sound gait develop gait problems at a similar rate to broilers that are initially classified as having affected gait. Further, the influence of stocking density on the progression of gait abnormalities of broilers with sound and poor gait is unknown. Finally, since space becomes more and more limited as broiler chickens increase in body weight and age, it is unknown how the provision of space during the finisher phase, when broiler chickens are gaining weight rapidly, can influence their walking ability and welfare outcomes. Stocking density is calculated based on projected final weights of broiler chickens from the time they are placed on a commercial farm, and that projected stocking density remains the same from the chick placement date. As stocking densities are increased, there is also an increase in the prevalence of lameness. Age is also known to be related to walking ability, and as broiler chickens age, there is an increase in the prevalence of ... |