When do you plan on breeding them?

I would guess that your hay and the lick tub would be sufficient to grow them out.

We like to see ours go to grass at a green 650-700 lbs. The bulls don't go out until July 1 so they are really on the gain by then. 84 head this year, 7 open, 6 outside the first cycle. They weigh 900 to 1000 lbs now. Big enough for us.

The emptys were 2 younger heifers and 5 of the biggest heifers.

Barley is close to $400 per metric ton delivered here, rolled. GSP pellets are about $240 and can be very poor in quality. Ours will get average hay, lick tubs and a bit of oat and pea silage about 140 days (all the bale silage we have). Have not done this before so it will be interesting how they do.

As BMR said, don't get them too fat. 3 lbs is not too much if your hay is average to poorer quality.