Title
Cage size and enrichment effects on the bone quality and fluctuating asymmetry of fattening rabbits Cage size and enrichment effects on the bone quality and fluctuating asymmetry of fattening rabbits
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Champaign, Ill. ,
Subject
Biology
Source (journal)
Journal of animal science. - Champaign, Ill., 1942, currens
Volume/pages
90(2012) :10 , p. 3568-3573
ISSN
0021-8812
1525-3163
ISI
000309590700028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We studied the effect of increased cage size on different aspects of bone quality (bone strength, diameter, weight, and length) and fluctuating asymmetry (FA). Such characteristics may indicate improved animal welfare, as greater bone quality may decrease fracture incidence during handling, whereas decreased FA has been suggested to signal decreased stress. As stress is likely not only influenced by the quantity of space, but also by its quality, we also studied the effect of environmental enrichment. Groups of 8 rabbits were housed in wire open-top cages of 0.40, 0.46, 0.53, 0.64, 0.80, 1.07, and 1.60 m(2) from weaning until slaughter. All cages of 0.40 and 0.46 m(2) (12 cages/size) were left barren to allow sufficient mobility. One-half of the larger cages were enriched with a wooden-enrichment structure that could be used to gnaw on, hide in, or lie in (6 cages per size x enrichment treatment). Increased cage size led to an increase in tibiofibula diameter (P = 0.008), a tendency for increased tibiofibula weight (P = 0.051), and decreased FA (P = 0.010), suggesting improved welfare. Bone length and strength were not affected by cage size (P > 0.1). Enrichment did not affect FA (P > 0.1), in contrast with our expectations based on previous glucocorticoid analysis. This discrepancy between indicators may be due to sensitivity to other types of stressors or different sensitive periods. In summary, rabbits housed in larger cages had wider, heavier bones, but the absence of changes in bone strength indicate that this is unlikely to result in decreased fracture incidence. In larger cages, FA was lower, suggesting a favorable effect on welfare, whereas no effect of enrichment was shown.
E-info
https://repository.uantwerpen.be/docman/iruaauth/7bd70a/b983496.pdf
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