light a candle in a jar and place in the drinker............may i add,mine have been frozen untill 2pm last two days and none dived for the drinker.maybe more of a problem for the early breeders though...
get the BHW stopped the RP.i found the RP to be good some weeks crap others i miss the r adams bits and m lycett column.must add dont learn much from BHW though just keeps you up to date with the rpra.the net is the place if you want to improve your results.