one more thing to add to what the first person said, I dont know what kind of blanket but, I would be afraid she may get caught up in her blanketand if it rains she cant get dry! youd be better off giving her more shelter, the weather (cold) will help her grow a thicker coat where as the blanket, if its on all the time will retard that winter coat growthalso corn is a heat producer, make sure its either in her regfeed or add some to it, or get ears of it and throw one or 2 in with her feed.
Considering she is a Thoroughbred, yes you need to blanket herGet her the heaviest, best rug on the marketYou need to rethink keeping your horse there, if she doesn't have a shelter and is out yearly then that is animal abuseI am sure that you can find somewhere that is the same price that you are paying for already that at least has a shelter !
We put on waterproof lightweight blankets on the thoroughbreds only when it's raining out and below 50 degreesA horse will grow the hair it needs.If you put the blanket on though she will not grow her winter coat very thickI agree with the answer that you need to keep her hay supplied so she can keep warmShe really does need a better shelter though.
Studies show that horses are their most comfortable at around 50 degreesWe humans think they are cold and they are just loving it! When you blanket a horse, you collapse the hair to their skinNormally the hair allows a layer of warn air to stay next to the skin and keep them warmBlanketing just ruins their natural heating systemBetter to put a couple of roof out there, maybe one with three sides for rainAlso, free-choice hayHorses stay warm by eatingI know it is pasture but some inexpensive grass hay on a cold night will make them warm and toasty and happyI only have a blanket for cold rainy nightsIf they get wet, the hair also does not keep the warm layerThey are loving their chilly nights!
