There is a book I have just bought (Storeys guide to goat keeping for meat) and it has a table in it. If you measure the goat's girth just behind from legs there is a conversion to weight. Saves struggling to balance on bathroom scales!!
Stupid Me! I'd forgotten that, I have a table from a web site, downloaded for checking weight for worming doses, also a line-graph type 'thingy', got a way to go anyway I think
. As long as they stay happy in the bottom field I'll be happy to leave them munching.