Annie Mears, [22 Sep 2022 at 13:08:08]: Does anyone know what range of species you can use PZP for? Are there any studies? Mostly thinking zebra and donkeys? Erik Verrynne, [22 Sep 2022 at 13:21:25]: There are a few papers published. I can put you in touch with Henk Bertschinger which developed it and supervised extensive use in elephants with Audrey Delsink, and Grace Kahler, who was HSuS field program manager for the PZP in wild asses in Arizona for first hand information if you want to Henry Labuschagne, [22 Sep 2022 at 14:16:39]: Porcine zona pellucida (PZP) immunocontraception of wild horses (Equus caballus) in Nevada: a 10 year study - PubMed Porcine zona pellucida (PZP) immunocontraception was investigated for possible use in free-roaming wild horses in the western USA. A protocol of two injections (3-4 weeks apart) of vaccine lasting 1 year was first used and a single-injection controlled-release vaccine of 1 year duration was developed ... https://pubmed.ncbi.nlm.nih.gov/12220157/