First thing-- if you say you are "grass fed" and put them on grain for 1 day they are no longer grass-fed-- call yourself "all natural" Beef instead and don't be giving us grass fed beef folks a bad name.
We wean at 7 months Most of our steers coming off clover in April wean in the 650 lb range ; heifers wean usually 50-80 lbs lighter(May), they go on Millet all summer, limit grazed; and steers gain about 2.7lbs/day and heifers gain somewhat less around 2.4 lbs per day.
Steers 650 beginning weight May June July Aug Sep ~ 350 lb gain (on forage) = 1000 lbs
Oct- clover baleage normally puts about 2.2 lbs of gain/day = 1066 lbs
Nov- clover baleage = 1130 lbs
Dec- Limit grazed on Rye and fed clover baleage 2.5lbs/day gain = 1205 lbs
Jan - Limit grazed on Rye and fed clover baleage 2.5lbs/day gain = 1280 lbs
Feb - 30 days on Clover(fresh) limit grazed to finish = 1350 lbs+
70% Grade High Choice YG 2
18% Grade Med Choice YG 2
2% Grade Low Prime YG 2
Just so you know--- Grass fed beef has 6 times as much Omega 3 fatty acids than does Grain fed beef.
It is this imbalance of the Omega 6 and Omega 3 essential fatty acids that makes the grain fed product less healthy for you
We retain ownership on grain fed cattle through the feedyard and there hasnt ever been a year where 70% of all our grain fed beef steers Graded High Choice YG 2 (but of course "we" weren't feeding them)
Last but not least-- people are willing to pay more money for real grass-fed beef