Not sure where you are located but here with hay protein being of great quality and intensive grazing along with free choice feed it's not a hard reach for us
We have raised Jersey beef for years and marketing it at a premium for just as long.i can say this about it when we fed whole grain it took a lot of feed but since we started roasting it we use about 1 quarter less feed and finish up in fourteen months around a thousand lbs
If you. Can get a mix of 75%corn11%beans14%barley this I find is best for Jersey growth.we are averaging 2..88lbs a day on this feed and roast all our grain as well to Increase tdn for them they have full access to hay or grass and finish around 1000 lbs in 12 months and dress 580