she doesn't seem to drop gain when she chews and does well with her hay (we do wet it for her to help her out a bit). .... but I now think that she needs a round bale which she can munch on at night ....She also gets 900grams of Purina Integri-T soaked to a mash (it's the highest protein/fibre/fat) complete feed
I would be cautious about feeding her grain, but I suppose you mean the Purina stuff? Is this a ration balancer? Ingredients look OK except for ground wheat
. I would be wanting to make sure it does indeed balance out with the pasture/hay she gets, esp considering the wheat & high protein, which can be problematic especially with older horses. Perhaps speak to a nutritionist or get onto feedxl.com or such. I would avoid feeding sweets to your horses.
If she's got grazing over night, I wouldn't generally worry about making sure there was always hay, but if she's otherwise going hungry for any length of time, then yes, hay over night too. Wetting hay isn't a bad idea IMO, because it can often be dusty & sometimes a bit mouldy(tho that's best not fed anyway), but it won't 'help her out' because of her age - either her teeth are ok or they aren't. If they are, she's also better off getting fibrous feed that needs chewing, rather than a mash. Chewing creates saliva which is an important buffer against stomach acids.
when we got her before the winter she was a little more filled out (I do not like seeing her spine it seems to stick out on the top of her back) and it was not like that in the fall.
Perhaps she was obese then & a bit better now, but lacking muscle, hence the spine & angular rump. Yes, IME that's the normal tummy shape for an unfit horse who has spent long years as a broody.