Hi, basically agree with all above. But I wouldn't necessarily start feeding more if the horse started dropping weight.... thinking of all the fatties I know that desperately need a big drop!
Originally Posted by toke
How much more grain and hay will she have to eat to make up for not being able to eat grass outside all day (For example, will she need twice as much hay as she usually gets and the same amount of grain)?
Horses need on average 2-2.5%bwt daily in roughage. Can't tell you whether that'd be twice as much as you're giving now, cos don't know how much you're giving now. She won't need grain just because it's winter. High starch, hard to digest feeds like that aren't the best for horses anyway & if she needs more than the hay/grazing gives her, I'd give her more of that and perhaps include a little lucerne/alfalfa hay &/or beet pulp &/or ricebran or such instead of grain.
I do believe well balanced nutrition is important for health & most horse's diets are deficient/imbalanced in a range of nutrients, so you'll have to weigh up what she's getting compared to what she needs, to work out what supps may be appropriate for her. FeedXL Horse Nutrition: The D.I.Y. Equine diet planner
is a great resource for that.