Horses heavy breathing and coughing

[ZMEquestrian_x]

My mare has been in our top field since April, when she first went in there she didn’t cough or breathe heavily at all, after a couple months being in there however she started to cough and the start of rides and just generally made a wheezy noise when walking in from the field etc. I started giving her some turmeric and bought her some easy breathe licks however nothing seems to be helping.
We brought another elderly mare into the same field around July/ August time and now she’s seeming quite wheezy too?! I’m wondering if it’s something to do with the grass in that field, I read somewhere about there being red or grey on the tips of leaves but I can’t remeber the specifics?
Anyone know what the possible causes of this could be? Thanks

 

[Highflinger]

My boy gets wheezy each year from about late May to early Oct (subsiding now) which is pollen/allergy related. Even in summer when it is raining he is much better - this summer we had virtually no rain for 3 months!! Have tried various "breatheasy" type supplements which have not worked. Ventapulmin works well when he is really bad and I also use a human asthma inhaler with a babyspacer which certainly helps.
I think grass pollen is the main culprit but probably some trees as well.

 

[Annagain]

I think I'd have the vet out to give them the once over.