I have a QH mare that I keep on hay only. Due to having to change boarding stables twice this spring, we are having trouble getting her access to free choice hay. I have her eat hay only as she gets hot on grain. Her latest boarding facility wants to add hay stretcher or grain to her diet as she is slightly thin.
Important Note: She is a 4.5 on the body conditioning scale and her vet says he likes horses to be at that score - he is very happy with her weight
My question is this: can hay stretcher make her hot? She gets 5-6 flakes a hay a day and pasture turn out all day every 3rd day right now. (14.2, and approx 830lb mare) The woman who owns the barn would like her to gain 100 or so pounds to "look better". She has no physical problems and is a joy to ride right now. In the past, on grain, she has been like a bronc horse - just insane - its not good for her (injuries) or me. I'd love to see a little more weight on her - but not at the risk of her going cuckoo. I'd rather she be healthy, happy and be able to barely see 4-5 ribs, than risk her injuring herself because she got hot.
Would appreciate any thoughts. Thanks in advance.