Ok-so I've been riding for 40 years, and teaching and training for 20. I have always based a horses' jump on his athletic abilities, scopiness, etc. I've seen the solid, 2'6 packers that can stretch to 3' but are better suited to the 2'6 job.
Bioactive vitamin D or calcitriol is a steroid hormone that has long been known for its important role in regulating body levels of calcium and phosphorus, and in mineralization of bone.
Vitamin D. Vitamin D aids the body's absorption of calcium. It is a a fat-soluble vitamin, meaning it is stored in the liver and fatty tissues. Vitamin D is essential for bone strength, hardness and growth, but is found in very few foods. The main source of vitamin D is sunlight, although it is added to some foods.f you take a supplement, try salmon over a leafy green salad to get both vitamins C and D with your calcium. A glass of vitamin D-fortified milk is another great way to get calcium in your diet. Not only does it pair calcium with vitamin D, but the lactase in the milk even helps your body absorb the calcium.