Abstract

Coyotes (Canis latrans) have been and continue to be significant predators of livestock, mainly domestic sheep. Managing coyote predation remains a challenge. A variety of non-lethal population control methods including reproductive inhibitors are currently being tested. The primary constraint of an efficient, inexpensive biological control method is developing a species-specific method of delivery. The purpose of this study is to test the efficacy of the Coyote Lure Operative Device (CLOD) for delivery of oral reproductive inhibitors in Southeastern Wyoming in conjunction with enhanced sensory cues and winter weather variables. One hundred and ninety CLODs were activated during the study period, November 1, 2007–April 3, 2008. DNA analysis confirmed activations by 66 coyotes (Canis latrans ), 90 red fox (Vulpes vulpes) and 7 unknown canid species. Preference for activations of CLODs by coyotes with Karo® syrup when used in conjunction with a lure (Fatty Acid Scent) was significant (F _{3, 1052}=6.18, p=0.000). No correlations were found to exist between number of activations and weather patterns. This field research shows that oral reproductive inhibitors can be delivered to free ranging coyotes during the winter, via the CLOD. The data shows that the CLOD is not a species-specific delivery device; rather, it is a canid specific delivery device.