Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Sharyn,
You are 100% correct! Your mare needs to be able to graze 24/7 in order to keep her digestive system healthy. And, the crazy thing is, that if you stress her by keeping her isolated and without something to nibble on, she will actually hold on to more body fat! This is due to the release of cortisol, a hormone that promotes body fat storage.
So, if you're going to cut back on anything, it would be on any starchy feeds. You didn't mention if you're feeding her any oats, sweet feeds, etc., but if you are, totally eliminate those from her diet. And, let her graze. The hay needs to be nutritious - so don't worry about the protein level. Grass hay is typically low in protein.
Beet pulp is an excellent source of calories for the horse that needs more in order to do work. It is a safe feed source, unlike too much grain.
Don't go with straw -- it is not only low in nutrients, but can cause choke. Instead, let her be a horse and graze. You should also provide her with a small amount of alfalfa pellets in order to improve the quality of the protein in her hay. This will allow her to use the protein to make body tissues, instead of being burned for energy or even stored as fat.
A good overall vitamin/mineral supplement is important (such as Accel). And, if she starts to put on fat deposits on her crest, rump, back, etc., then consider adding a magnesium supplement, as well, such as Quiessence.
I hope this is helpful. You're on the right track -- go with what you know to be correct.
All the best,
Dr. Getty
Where are you from? Bayfield, CO