Friday, May 29, 2020

BLM Tests Fertility Drug to Control Wild Herd Growth - full article

Oocyte growth factor (OGF) lasts three years or longer and is a potential alternative to PZP.

Posted by Pat Raia | May 28, 2020

The Bureau of Land Management (BLM) has begun testing a new fertility-control vaccine it hopes will become an alternative to contraceptive porcine zona pellucida (PZP) for controlling wild herd growth. While some wild horse advocates believe the vaccine could reduce the need for controversial wild horse gathers, others maintain that the agency is not allowing enough public scrutiny of the testing.

In use by the BLM since the 1990s, PZP is injected into wild mares to produce antibodies that prevent sperm from attaching to an egg and fertilizing it. Mares on the range receive PZP via dart gun, while gathered mares are administered by syringe. The contraceptive is effective for about a year...

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