Physical Sciences and Mathematics Commons^™

Contraception Of Wild And Feral Equids, Jay F. Kirkpatrick, J.W. Turner Jr., I.K.M. Liu

Contraception in Wildlife Management

Fertility control in wild horses has been attempted with both stallions and mares. Nonreversible surgical sterilazaiton by means of vasectomy has been successful in inhibiting reporcution in wild horses in Montana and Nevada. Administration of a microencapsulated form of testosterone to wild stallions reduced sperm counts and motility and foal counts. In a third approach, intraperitoneal Silastic^TM implants containing ethinylesdtradiol and progesterone blocked ovulation in wild mares for up to 3 years.

The first immunological fertility control of free-ranging wildlife was accomplished with wild horses, Initial experiments demonstrated that immunization with porcine zonae pellucidae was capable of causing contraception …