I'm been having some problems with Baby Girl recently. We've been doing 50 miles rides every other weekend, plus moderate riding in between. She's gradually lost weight all season, but two weeks ago I really noticed. I could see her ribs. Her neck no longer ties "smoothly" into the rest of her body. No crease down her back; a decent ridge though. I sat on her bareback, and I could strongly feel her spine and withers. Her body score is usually on the heavy end of a 5, but she's dropped to a 4 at least.
She has 24/7 round bale access. She eats 2 pounds a day of alfalfa cubes and 2 cups a day of oil (along with a multivitamin, electrolytes, and a digestive supplement). What should I increase? Advice?
I have three weeks until my next 50, and then a long break over the summer to get her back looking normal.