Developed PZP for use in 85 species          Jay Kirkpatrick,  75,  for more than 40 years a leading developer of contraceptive vaccines for wild horses,  deer,  elk,  and other wildlife,  died on December 16,  2015 in Billings,  Montana “from a brief but serious illness,”  family and friends said. Kirkpatrick,  originally from Bucks County,  Pennsylvania,  spent […]