My 2 jills are coming up to 9months now & are working great.I suppose it may take some ferts longer than others to cotton on what it,s all about.I had a couple of messing about sessions to get them familar with locator collars,nets etc in october in a few easy burrows before going to my proper ground.They sharp grew up soon as they relized what it,s all about now there mad for it can,t wait to get down them burrows