Yes, Horse back riding is very physically demanding when done properly also there is care of the horse including mucking out, grooming etc.
Oats and grains are high energy foods, great for horses that get frequent exercize.
the horses owners
No, not unless you cut their feed or exercize them more with out raising the about of feed, but you can do that in winter too.
some horse owners do not know and some are aware of what is happening to their horses.
The horses are owned for transport, or in other countries for food.
The horses carry loads to wherever their owners want them to.
They can kick their owners, fight w/ the other horses, injurse people, etc.
Yes.
Yes
from horse owners
Some owners geld their horses because stallions have a tendency to get distracted easier when mares or fillies walk by. Especially with racehorses. Their focus is better,
Light and heat.