Usually horses weigh more than 100 lbs unless they are newborns. I would guess that a 100lbs horse should be fed about 1/4 of a scoop of grain. You can buy the scoops I'm talking about at Tractor Supply. If your horse was bought at an auction wieghing that little, I would suggest taking it to a vet nearby to check for any medical issues. Underfeeding a horse is a terrible sign of neglect, so it is best to ease it into eating the ammount I told you so you don't have to worry about your horse collicking.
100lbs per year
It just depends how much they exercise, how tall they are, how much they eat, or how many calories they burn.
It's ok for horses to eat some Daisy's but too much of anything can be bad so just be sure they don't eat too much.
100lbs- 200lbs
What ever you give them and what ever grass they can eat!
All horses are different, and that means they eat different amts. of food. Some horses will eat until they get sick, and some may not eat enough. Therefore, there is no specific amt. for horses to eat.
It depends how tall you are, what you eat and how much exercise you get. If your in a healthy-ish condition, I would say 80-100lbs
5'0 100lbs
About 100lbs...on the moon.
100lbs
You would weigh 106.4 pounds on Saturn if you weighed 100lbs on earth
horses can graze (eat) for up to 16 hours a day.