Ridgetop
Herd Master
Well.... a huge belly simply could mean she has great rumen development, and is eating a bunch of brush.
A belly on a goat has little to do with fat.
For fat on a goat you look at ribs and spine.
You want to be able to feel the individual ribs, but not really see them. You want to feel the spine and not have it prominent or have it hidden.
If you want her to reduce extra fat (depending on what you see and feel) I would cut out the grain. Is her "buddy" a wether for market? If so, he can continue getting grain as long as he does not get fat.
If you are judging her by how she looks compared to your market wether, don't. A good breeding doe or ewe should have a nice deep brisket and large rumen. A large rumen will allow the doe to take in enough food capacity during pregnancy while allowing enough room for the kids to grow. A small rumen is a flaw in a breeding animal. The thing to look for is not the stomach size, but the amount of fat (not muscled flesh) on the doe. Is she small framed or large framed This will make a difference in how much muscle covering she needs. Do you have a 4-H breeding goat or sheep leader? If so they can feel your animal and help you determine condition scores.
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