I have no experience with this, but here are some threads on prolapse from our FAQ page:
Prolapse:
https://www.backyardchickens.com/forum/viewtopic.php?id=32448
https://www.backyardchickens.com/forum/viewtopic.php?id=26390&p=1
https://www.backyardchickens.com/forum/viewtopic.php?id=20555