I am not sure just how old they were as I forgot to write it down but I think I went through 50 kilos of milk and they were on lamb pellets for quite a while. I have the sales invoices in one of my boxes but have been putting stuff up in the loft and I am pretty sure that's where my box will be. Its not a cheap way of raising lambs, buying a ewe with a couple of new Born's might suit you better. I have also had lambs go to slaughter in February and they were just as good, again I fed them through the winter which is added on cost.