Mare's often produce some additional vaginal fluid during heat due to hormonal changes. Technically this is a discharge however, with no description of the discharge being observed it is not really possible to know if it is normal.
Yellowish, green, smelly, brownish, bloody...abnormal. Clear, translucent barely white probably fine.
They can, but usually not. Horses will mostly only mate once the mare is in heat.
Strangles
no
They don't have periods, but they do come in heat. When in heat, they will let out some yellow discharge.
Answer. Horses usually do very well in heat but if they still have a long coat on while it is hot you need to shave the horse, so it does not over heat.
low dish sper heat
yes they do and you have to keep mopping it up an every time they sit then move there is a patch of red discharge
Your horse will rub her rump against the fence or stall. She will try to cycle with your horses including fillies and mares! She will get very moody. She will have some vaginal discharge too.
Discharge!
Horses with Strangles may initially only be lethargic, run a mild fever or have a clear nasal discharge. As the condition progress, nasal discharge will become thick and yellow and swelling will appear between the jaws or even under the ears where the head and neck meet and the fever may become quite high. Horses may stop eating or have difficulty eating. In severe cases horses can have serious difficulty breathing.
A shield which protects the horses pulling the sun from its heat.
Wait at least two weeks after the discharge stops. The heat period lasts approximately three weeks, but she'll only have a discharge during the first week. For safety sake, it is best to wait three weeks after the discharge stops just to be sure.