[QUOTE=Eventer55;6434763]
Mare is only 60 days along, I’ll look into ration balancers.[/QUOTE]
This. I have a Mrs. Blimpy too.
The mare’s nutritional needs are just for herself until at least about 6 months. So, she needs nothing, especially no grain. If you’re worried, just do a small bit of ration balancing. For my Blimpy, she gets 3 times weekly a handful, (literally), of beet pulp in which I can stir in no-calorie Hoffman Minerals. Until she moves into her final trimester, I don’t alter too much for her. Our winters are usually brutal, so it tends to take care of Blimpy’s excessive weight problem, but she still does well on mixed hay of timothy/orchard/wee-bit alfalfa.
However, that all being said, first trimester pregnancy is NOT where you want to be on a radical weight loss program. You could risk losing the pregnancy.
It would be better to maintain her weight as is. As she moves into final trimester, this is where foal will peel some excess flab off her, but don’t let her drop below 1/2 inch over the ribs during pregnancy at any point. 1/2 inch of fat over the ribs offers some cushion for the radical caloric needs of lactation.
So, do what you need to do to keep her maintained and nutritionally correct. If she’s used to exercise, you can keep riding her lightly until pressure from the foal makes this too uncomfortable.
Final trimester note: As unborn baby starts to gobble up her calories, especially in months 8-9-10-11, watch her weight - she can lose weight seemingly overnight.
Just ensure her entire diet ratios make up 12% calcium to 8% phosphorous in her diet. Fetus needs lysine and especially Vit A, E. Note that Alfalfa offers the lysine and proteins, but hay offers very little A/E or other vits/minerals so ensure your balancer and/or kibble is appropriate for all elements for Mrs. Blimpy. Whereas green pasture offers plenty of Vit A.
However, that all being said, I’ve also watched some very easy keepers become startlingly hard keeping once newborn literally sucks the calories right out of her and it can happen practically overnight. Increase her caloric hay intake upon delivery, but try to keep her at about 0.5 inch of fat over the ribs