I got a rescue back in february of this year and have been trying my butt off every since then to get her to gain weight. She has put on some but it is only under her belly. Her back and ribs still show horribly. Her teeth are fine and she gets wormed every month (vet says to) with a different wormer each time. She gets fed Manna Pro Sweet 10 - high fat formula, about 2-2/12 scoops of soaked beat pulp as well as some corn oil at feeding time. I was told that corn oil would help with weight gain. She also has a round bale of grass hay available to her all day long. What can I do to get her to gain some weight? I have another horse with her, he gets fed the same as her and he is fat. Could I try a weight gain supplement?
Also, is it possible that she is pregnant? The place I got her from had many, many horses. I'm not sure if any were stallions but, she hasn't gone into heat in the 6 months that I've had her and she has only put on weight in the belly area. I have had horses for many years but never any pregnant mares so I don't know what to look for. I have also never had any skinny horses so I have no idea what to do with her.
Any advice will help.