Yes, when mares are in-season their hormone activity is changing and they can become very high spirited or high strung. Other emotions/ behaviors include depression, anxienty, or strong bonding with certain people (trainer, owner, etc.) or animals (stablemates-other horses, sheep, cows, goats, etc.- barn cats, dogs that may be in the barn, etc.)
He was really high spirited when he beat Star Fox 64. OR Everyone was really high spirited during Christmas. OR I was really high spirited when my team beat the baseball game. Hope this helps : )
All the years I have been with horses and learning about them, I have never heard of horses eating manure. Usually when mares are in season, they lift their tail up high and do what I always called "winking". Mares in season also stick their butt in the stallions face and pee more than usual. I think you should ask a vet or someone who knows a lot about horses in your neighborhood what does it mean when horses eat manure.
High spirited enthusiasm
A high-spirited; boisterous.man
Spirited Content High-spirited Enthusiastic
High-spirited or pleasing temperment.
jovial
Characterizd by energetic enthusiasm
A horse with a high spirit is typically referred to as being "spirited" or "high-spirited." The term "semi-wild horse" usually describes a horse that has some wild or feral characteristics but has been exposed to human interaction or domestication to some degree.
Generally the winter is high season and the summer low season because of the extremely hot temperatures. If you talk about hotel rates the days around certain large exhibitions become suddenly very high season.
Full of high-spirited delight.
Boisterous, joyful, luxuriant, high-spirited.