I wouldn't have agreed with him, but she is now vastly overdue (March 21st and today is April 19th!!
She doesn't even LOOK in foal, partly because she is slowly gaining condition. I have opened up a new very rich field to them today but nothing has meandered through, looks like they will have to be led and shown the grass. Our own home bred mares tend to know a yell of "Come up!" means fresh grass and come at a canter, these have yet to learn that.