Noun
PZP
Initialism of porcine zona pellucida.
The BLM also uses limited amounts of contraceptives in the herd, in the form of PZP vaccinations; advocates say that additional use of these vaccines would help to diminish the excess number of horses currently under BLM management. Source: Internet
The BLM has dismissed widespread PZP implementation and giving wild horses freedom in their natural habitat. Source: Internet