The temperature should be lowered by 1° at lockdown, the same time that you raise the humidity.
IMO, this step is purely optional as is pretty much every other 'lock down' rule and even 'lock down' itself... Broody birds sitting on eggs can't and don't count and thus don't do anything different from day 1 until the birds hatch, their only real method of time keeping when sitting is when the birds emerge from the egg, keep rotating out eggs before they hatch and you can keep a bird broody for months, they just keep doing the same thing with no idea what day it is...
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