Thanks guys! Good to know.
4 flakes was kind of a randomly thrown out number.
So I would adjust it to how much she's actually eating. Of the alfalfa she's getting right now, she's getting about a flake and a half (they're very small flakes, maybe 2ftx1ft, about 1 inch wide) everyday and about 3 flakes of grass hay (but it's REALLY yucky grass hay) and holding her weight pretty ok. I'd like to be feeding a lot less of the grass hay just because I know she doesn't hold her weight well on it (last winter she was up to 8 flakes of it A DAY and she got way too skinny).
Also, I'm thinking about getting her some beet pulp and starting her on that... Just for extra oomph.
She loses a lot of condition in the winter and I'd really like to get rid of the extreme difference between summer and winter. In the summer she is a little too chubby but in the winter, her spine just pops out like no other (it's not doing that yet but it's trying to come out to play) and I want this to be the winter where she looks great all winter. I think the thing with her is that to build good muscle she needs to look rounder and her ribs need to be completely covered, no way to feel them (if you can feel them, the rest of her body looks like it needs food), so in the winter when she loses that 50lbs, or whatever, that's making her round, she has a hard time building the muscle and keeping it. If that makes any sense whatsoever. Haha
How much pasture does she have?
Too much alfala/lucerne throws out the calcium/phosphorous ratio. If you balance it out by supplementing, you should be fine.
She has about 2 acres of pasture, that's fully covered in "grass". However, I'm not sure at all about the nutritional quality of the grass since we've already had major frost, a light snow, and we were below 15F for a few days.
What do you mean about supplementing? I'm totally new to this.