During the warm, longer days of spring and summer a mare will go into season or estrus every 2 to 4 weeks until she gets pregnant or cold weather sets in. For several months when days are short and the weather is chilly her cycles may go dormant or may be less noticeable. This can vary with individuals and is never set in stone.
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A horses hair is longer in winter months and then it sheds out in the summer.
wild horses by The Sundays
Horses are usually vacinated yearly.
yes.
In late fall or early spring
Yes, donkeys often graze with horses.
ticks
mares are in season in the late winter so the foals get borne in the spring or summer. and also the mare stays in heat for 7 days or less. Mares come into "heat" every month. Gestation for a horse is 11 months.
In horses, parturition(the birthing process) is often called "Droping the foal."
"The Funeral" by Band of Horses
yes and any other season too