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How tall should a mink cage be? Using animals’ preferences for different ceiling heights to improve cage design

By María Díez-León, Margaret Quinton, Georgia Mason

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Abstract

Regulations and guidelines assume that taller cages are better for mink, because they permit more diverse postures (e.g. standing upright) and freedom to move. New Canadian Codes of Practice therefore stipulate cage ceiling heights of at least 38cm, while in Europe cages must be 46cm or taller. However, minks’ food is placed on the cage top. To eat, adults must therefore stand upright, and young mink must even climb (in great contrast to wild mink, who eat their prey on the ground). Furthermore, these new Codes overlook that some North American cages have ‘drop-in’ nest boxes that restrict vertical space inside the cage. We therefore investigated how ceiling heights affect welfare, testing the hypotheses that mink prefer lower cage ceilings to feed from (Experiment 1), but higher ceilings for performing other behaviours under (Experiment 2). Experiment 1 involved 64 2.5 month-old male-female pairs (in cages 75L×61Wcm). Cage height was 46cm, except for a modified feeding area (15L×61Wcm) accommodating four heights: 25, 38, 46 or 53cm (spanning the range used in Canada and Europe). After mink were habituated to feeding from each height, food was delivered onto all heights and feeding observed, a procedure repeated monthly until animals were adult body length (at 7 months old). Experiment 2 gave 32 adults (half of each sex) free access to a compartment with a moveable ceiling (with one small covered patch mimicking the underside of a nestbox). This was set to 13cm (approximating the space under a drop-in nestbox) for 16 animals, being progressively raised every 3 weeks by 13cm; and to 51cm for 16 mink, being progressively lowered every 3 weeks by 13cm. How ceiling height affected compartment use was assessed. Experiment 1’s results were clear: the highest feeding heights (from which mink could not eat while sitting) were always avoided by females, and by males once 5+ months old (p

Publication Title Applied Animal Behaviour Science
Volume 192
Pages 24-34
ISBN/ISSN 0168-1591
DOI https://doi.org/10.1016/j.applanim.2017.03.002
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Tags
  1. Animal behavior
  2. Animal welfare
  3. Cages
  4. preferences
  5. regulations