Iophenoxic acid as a quantitative bait marker for foxes [Vulpes vulpes]
1993
Saunders, G. | Harris, S. (Bristol Univ. (United Kingdom). Dept. of Zoology) | Eason, C.T. (Manaaki Whenua Landcare Research, Christchurch (New Zealand))
The potential of iophenoxic acid as a quantitative bait marker for red foxes was investigated. Groups of adult foxes were administered doses of either 20, 40 or 60 mg, representing 1, 2 or 3 baits. Baseline concentrations of plasma iodine were compared with samples collected 1, 3, 6 and 10 weeks after exposure. Plasma iodine levels were elevated by 17-18 times base-line estimates after 6 weeks and had returned to pre-treatment levels in approximately half the foxes by 10 weeks. Application of regression analyses provided a relationship that could be used to estimate the number of baits eaten from post-exposure plasma iodine levels and the number of weeks after bait was offered.
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