Effect van bezettingsdichtheid op botsterkte en fluctuerende asymmetrie bij vleeskippen

Stephanie Buijs, Els Van Poucke, Stefan Van Dongen, Luc Lens, Jeroen Baert, Frank Tuyttens

    Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikel

    Uittreksel

    Because broiler chickens are juvenile animals
    undergoing physical development, stocking density
    during rearing may influence this development. Some of
    these physical changes may cause welfare problems, for
    example, decreased bone quality, which may lead to
    fracture during catching and transport. Others do not
    influence welfare directly but can be used as indicators
    of the animal’s ability to cope with its environment
    (e.g., fluctuating asymmetry). The present study evaluates
    the effect of stocking density on bone quality and
    fluctuating asymmetry. Birds were stocked at densities
    of 2.4, 5.8, 8.8, 12.1, 13.6, 15.5, 18.5, and 21.8 birds/
    m2 from 1 until 39 d of age. Increased stocking density
    had a negative effect on some aspects of bone quality
    (tibia curvature and shear strength). Tibias were
    shorter at high density, possibly due to increased curvature.
    Several other bone quality aspects (tibia weight,
    torsion, and dyschondroplasia, and femur curvature
    and epiphysis shape) remained unaffected. Middle-toe
    length was the only character that showed a significant
    increase with increasing density when each character
    was analyzed separately. Nevertheless, a composite index
    of fluctuating asymmetry, which combined data
    on all 11 measured characters, tended to increase with
    stocking density. Such increased fluctuating asymmetry
    may indicate decreased welfare. However, one of the assumptions
    of fluctuating asymmetry is that the animal
    is subjected to the same environmental influences on
    both sides. This assumption may not be fulfilled when
    leg deformations occur, as these may lead to asymmetric
    changes in bone growth by altering the division of
    force over the 2 legs. In addition, leg deformations decrease
    the accuracy of bone length measurements made
    in a straight line. This raises some concerns on the applicability
    of fluctuating asymmetry measurements on
    broiler chicken legs, especially because stocking density
    did not effect the asymmetry of the head.
    TaalEngels
    TijdschriftPoultry science
    Volume91
    Pagina's (van-tot)1759–1767
    Aantal pagina's9
    ISSN0032-5791
    DOI's
    StatusGepubliceerd - 2012

    Trefwoorden

    • B340-dierenmorfologie
    • B401-pluimveeteelt

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