my sow has been crushing piglets, every time i go into shed another one, this is her second litter and she was great with the first, she seems depressed and tired alot wont get up when i shake feed bucket, she is eating but not herself,she had 9 piglets alive and 7 dead now ive only 6 left and counting,i dont have a farrowing crate but have farrowing rails round the shed but no good they have a corner of shed boxed off ply with heat lamp in it but are always out beside sow.