Dead trees are exempt. Dying ash trees are a different matter as that gets a bit subjective. I would drop the elms or other dead trees pronto. I've cut some down before that you could nearly push over. Terrible shame and I hope the nation's ash trees don't all go the same way.
Maintaining grass quality during mid-season grazing is important. Farmers can maintain quality by entering ideal grazing covers of 1,300 – 1,500kg DM/ha, and grazing down to a residual of 4cm every rotation.
If you are now in a situation where cows are not cleaning out paddocks as well as they should be, leading to the development of steamy grass within the sward, here are some options.
Common options for rejuvenating swards include:
Take a silage cut, probably into bales, remove the material and start again with the aftermath...