Sponging involves inserting a sponge that contains hormones into the vagina of the sheep. The hormones in the sponge stimulate the reproductive system to become active, but crucially, for the egg to be released 48-55 hours after the sponge is removed. The tup (we're using Winston this year) is then added to the mix and then theoretically, all of the ewes should lamb within a window of a couple of days in the spring.
This is the first time that we have tried this on Bebington High School Farm and in this video, Jess Fleet demonstrates how the sponge is applied:
We've got our fingers crossed that this technique works for us - we've read mixed reviews, but you never really know until you try it yourself!