because it make sheep nosieThe ewe may isolate herself from the flock, and find an area to lamb, she will appear to be straining/contracting her muscles to expel the foetus.
by checking the teeth, different sets of lamb teeth are lost at different ages, after all the adult teeth are in then you check for tooth wear. The teeth wear down at a fairly predictable rate.
Well, if she was a naughty sheep in the night, she'll probably be ashamed and either not tell you for several months, or else she will try to get an abortion to hide her nocturnal activities from you...
If you would like to raise, show or breed sheep for fun and profit it is best to know as much as possible. There are many good books out there that deal with sheep. Check out Storeys Guide to Sheep,...