You are two weeks post winter solstice. The queen typically starts producing at this time. I would place a winter patty on the hives in addition to the sugar. A winter patty is mostly sugar but has some protein in it, enough hopefully for the new brood to be fed. Rusty Burlew of www.honeybeesuite.com recommends pollen sub anytime after winter solstice. If you do feed pollen sub, make sure they have plenty of sugar too.
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