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1 September 2006 PRELIMINARY TESTS OF A NEW REVERSIBLE MALE CONTRACEPTIVE IN BUSH DOG, SPEOTHOS VENATICUS: OPEN‐ENDED VASECTOMY AND MICROSCOPIC REVERSAL
Karen DeMatteo, Sherman Silber, Ingrid Porton, Kathy Lenahan, Randall Junge, Cheryl Asa
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Abstract

Open-ended vasectomies were performed on four male bush dogs (Speothos venaticus), with three having microscopic reversal surgery (vasovasostomy) between 10 and 20 mo post-vasectomy. The key to ease of reversal is leaving the distal (testicular) end open to allow leakage, resulting in a pressure-relieving granuloma. The proximal (abdominal) end is cauterized, providing an effective seal. This technique prevents the buildup of pressure in the epididymis, therefore limiting damage to the male's reproductive capacity. Described here are detailed procedures for both surgeries. One of the three males that underwent vasovasostomy has successfully impregnated his female partner. This study demonstrates that these techniques can be successfully applied to animals. With the two remaining pairs, none of the four individuals were proven breeders prior to the study, so it is not possible to eliminate the possibility of previously existing infertility. This technique may have limited application for carnivores, because vasectomy does not prevent potential adverse effects to females from prolonged, cyclic exposure to endogenous progesterone. In other taxonomic groups (e.g., primates, ungulates, marsupials, and rodents) in which multimale groupings are common, this reversible male sterilization technique could provide managers with the ability to control which males reproduce without eliminating their future reproductive capacity or social interaction.

Karen DeMatteo, Sherman Silber, Ingrid Porton, Kathy Lenahan, Randall Junge, and Cheryl Asa "PRELIMINARY TESTS OF A NEW REVERSIBLE MALE CONTRACEPTIVE IN BUSH DOG, SPEOTHOS VENATICUS: OPEN‐ENDED VASECTOMY AND MICROSCOPIC REVERSAL," Journal of Zoo and Wildlife Medicine 37(3), 313-317, (1 September 2006). https://doi.org/10.1638/05-069.1
Received: 7 July 2005; Published: 1 September 2006
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KEYWORDS
bush dogs
male contraception
open-ended vasectomy
reversible sterilization
Speothos venaticus
wildlife
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