A total of 43 female elephants have received the first of three immuno-contraceptive injections that will render them temporarily sterile in the largest elephant contraception exercise yet to be undertaken.
Largest Elephant Contraception Exercise Begins
By Melissa Wray
Chief executive Andrew Parker said, "We feel that the elephant population is already at its upper limit" and the decision to introduce contraception was discussed at the reserve's last annual general meeting.The reserve also plans to decrease its elephant population by relocating about 10 animals to the Eastern Cape. The 43 elephants to undergo contraception have been injected from a helicopter with a dart containing PZP (porcine zona pellucida). PZP contains pig proteins that cause the elephant's immune system to create antibodies.The antibodies stop sperm from fertilising eggs, and so make the elephant temporarily sterile without affecting its reproductive hormones. Three shots are needed per elephant, administered about a month apart, to ensure effective contraception when the programme is started.After that, a booster shot once a year keeps antibody levels high enough to prevent the elephants from becoming pregnant. Welgevonden will appoint a full time elephant monitoring assistant to ensure the contraception programme has no adverse effects. They are currently looking for a suitable candidate for the position.