Pioneer of PZP in Wild Horses Dies at 75

PZP has been used in fertility control programs in the United States since 1989.  Through the years, advances in PZP and other fertility control vaccines have improved delivery and efficacy making them a more viable alternative to lethal control methods.

Jay Kirkpatrick was arguably the most influential person in the development of this humane method of controlling over abundant species.

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Pioneer of PZP birth control in wild horses dies at 75

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