On beef calves that size, I feed a 50/50 blend of corn gluten & soy hull pellets while on grass/hay. Some use a 40/60 blend of ddg & soy hulls. Get cheaper gains than using corn mixes. There are some feed suppliers that will blend different feeds in the delivery truck and not charge the $30+/ton mixing charge so it pays to shop around. Not sure I would feed 100% ddg or corn gluten (at high levels-not over 1% of bw) as the high sulfur levels can cause problems. Wheat midds are another byproduct that can be used with cgf or ddgs. Don't focus entirely on cost per ton as some ingredients have a higher feed value than others.
Especially on holstein calves, you should be able to put 300# + on them without getting them too fat while on a self feeder.
Don't focus entirely on cost per ton as some ingredients have a higher nutritional value than others.
OSU has a ration formulation spreadsheet you can download. I use it to calculate and compare different mixes and feeding rates. Have learned that a 2-300# calf is very feed efficient.
Just my 2 cents worth.
