If they have still plenty of grass and a wee bit of concnetrate, they shouldn't need any additional feed until about 6 to 8 weeks before they are due (plenty of hay after Christmas, especially if snow on the ground) I don't feed any licks until February, but mine are now on hay (not ad lib) and a very small amount of concentrate, as I need them to come into a pen every day for a check ony limping ones. (I have been battling lots of scald attacks). We have now also snow on the ground.