how much to feed pregnant heifer?

hi i was wondering how much hay we should be feeding a pregnant 2yr old heifer?she gets about 2lbs of grain a day.so how much hay would you all recomend feeding her?we also have a yearling bull. how mch for him? he also gets grain daily.they both have shelter from the weather. we are in northernlower mich. she is due to calf in may. thanks in advance cindy

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