There are some disturbing simularities. Here is some information from [St. Lous Zoo I found about PZP:](https://archive.ph/dwo7Z) >**Latency to effectiveness** – PZP is not effective until after at least **2 injections (typically given at 2-4 week intervals)**, depending upon species and adjuvant. **There must be a minimum 2-week interval after the last injection** before the male is placed with the female. The timing of booster inoculations is species-dependent and each institution will be advised regarding booster inoculation intervals... # #blow dart compatible >3) animals requiring remote delivery of a contraceptive rather than hands on; remote delivery is possible with the 1.0cc volume. # #weird bleeding lady problems >**Estrous cycles during contraceptive treatment** – PZP should not suppress estrous cycles and may extend the breeding season beyond what is considered typical, resulting in additional estrous cycles. # #familiar schedule >**Duration of efficacy and reversibility** – PZP becomes effective after initial inoculations, typically given at a 2-4 week interval, depending upon the species. >**Consideration for seasonal breeders** - Because PZP is not effective until after at least 2, preferably 3, injections (typically given at 2-4 week intervals), depending upon species and adjuvant, treatment should be initiated at least 2 months before the anticipated onset of the breeding season.