We lost our first ever lamb ..... dead in the field in a tight bag. Felt so guilty that I hadnt spotted that mum was in labour.

My favourite little ewe too.
Can recognise now when they are close, though some give very little warning. Very few gave any of the signs that I had read about eg. pawing of ground, isolation from flock. One ewe stayed in the middle of everyone butting them out of her way until the last minute!
We only have field shelters to lamb in. Most of the ewes went at the very last minute into one paticular shelter and gave birth in there. All we had to do was close the gates and they stayed in until we were sure they had bonded. It worked quire well but only have 7 ewes and the births were spread out.
Checked them every hour and a half during the day, often a lot more frequently. Have to say I found it quite exhausting, partly nervous energy I think. Only had 7 to lamb ...... cant imagine how you would feel with a bigger flock.I think we may have lost a couple of twins if we had not been there, because as you say they were delivered in their bags. The first time mums were so busy with their first borns that they didnt seem to notice the bag on the floor!
Did wish for a barn when the last twins were born, luckily in the shelter, in the early hours, on a very icy night. Hubbie was away ... so just my ten year old and I with our head torches!
Keep going. When it was finished, we were a bit sad that it was over!
