Just a thought - you are not going to get much of a price for 8 week old lambs. It will not cover the price of keeping the ewe over the past year. Also, it seems a shame to sell lambs so young when they are still fairly dependent on their mothers, so will suffer quite a set back on weaning. If you are short of grass this year, will you not be equally short of grass next year? So would you not be better reducing your flock size altogether and selling sufficient ewes with their lambs now, so that you have enough grass left to keep the rest with their lambs and wean them a month later when they will be bigger and fetch a better price?