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Space needs of broilers

Published online by Cambridge University Press:  01 January 2023

EAM Bokkers ,
IJM de Boer  and
P Koene
EAM Bokkers*
Affiliation:
Animal Production Systems Group, Wageningen Institute of Animal Sciences, Wageningen University, PO Box 338, 6700 AH, Wageningen, The Netherlands
IJM de Boer
Affiliation:
Animal Production Systems Group, Wageningen Institute of Animal Sciences, Wageningen University, PO Box 338, 6700 AH, Wageningen, The Netherlands
P Koene
Affiliation:
Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AH, Wageningen, The Netherlands
*
* Contact for correspondence and requests for reprints: eddie.bokkers@wur.nl
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Abstract

There is continuing debate about the space needs and requirements of broiler chickens, The aims of this study were to measure the amount of floor area a six-week-old broiler occupies for different behaviours and to use the obtained results in two models to estimate the number of birds that can be kept per m2 in large flocks simulating different levels of behavioural synchronisation. Photographs were taken of overhead projections of broilers (2.468 kg on average) kept in floor pens of 1 m2 with either eight (low density) or 16 birds (high density) per pen. Individual body space was measured from these photographs for seven behaviours. Posture and density affected body space of the behaviours idle, drinking, and ground pecking. The first model, computing space needed per bird performing a behaviour in relation to flock size, showed that 15.3-15.7 birds m−2 (37.8-38.7 kg m−2) can be housed maximally, based on low density measurements and 18.5-19.4 birds m−2 (45.7-47.9 kg m−2) based on high density measurements. The second model, computing stocking density based on synchronisation of behaviour and body space, showed that 13.7-15.9 birds m−2 (33.8-39.2 kg m−2) can be housed maximally based on low density measurements and 15.4-18.6 birds m−2 (38.0-45.9 kg m−2) based on high density measurements. Results based on high density measurements implied that birds are compressed. Given the restrictions of a limited number of behaviours and no inclusion of movement and social interactions in the models of this study, stocking density in large flocks should not exceed 16 birds m−2 (39.4 kg) because that would lead to compression of birds which will suppress opportunities for behavioural expression and therefore impair welfare.

Keywords

animal welfarebehaviourbroiler chickenmodellingspace occupationsynchronisation

Information

Type
Research Article
Information
Animal Welfare , Volume 20 , Issue 4 , November 2011 , pp. 623 - 632
Copyright
© 2011 Universities Federation for Animal Welfare

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