I fed my Paint filly the Equine Junior Development from Purina until she was about 2, but only as an "extra" and not as a main source of food. I'm no expert in nutrition so hopefully others will have something to add...
You probably don't want to follow the guidelines on the bag as they are calculating it as if it is the only source of food, making it up to 3-5 kg of the stuff if I remember right (6-10 pounds!!)
I found it was a good feed, and it is balanced for young growing horses, I would just not feed according to the recommendations on the bag.
My filly was outside 24 hours a day in the summer and 12 hours a day in the winter and was primarily eating grass hay. She was getting about 3 lbs of Junior Development per day as a yearling during the winter months. And I wasn't trying to grow a halter baby - she is my future competitive trail/endurance horse, so I was very concerned about not overdoing anything in terms of nutrition. She was not fat, her ribs could be easily felt and she did not have any growth issues.
Hope this helps a little :)
Lysane
I was going to switch to Purina's Equine Junior: http://horse.purinamills.com/products/prd_EquineJunior.html but it looks like it's for halter-babies? They say "hay is optional". I want this guy outside being a horse, but I want to make sure his nutrition is being met without over-doing it. Can I still feed this stuff at about 1.5 to 2 pounds a day? Or if there are other suggestions, I'm open to those as well. As the temps plummet and the pasture becomes fully dormant, I will be adding a little alfalfa hay to the grass hay.
