Victorian dairy farmers are being urged to do all they can to keep their cattle cool as hot humid conditions cross the state.
Temperatures are forecast to hit over 40C, at Mildura, in the north-east, to 38C in Melbourne.
Dairy Australia has a that gives farmers advice on how to prevent heat stress and a loss of milk production in their herd.
Dairy Australia consultant, Steve Little, says the website also provides a new tool that factors in the effects of wind speed and the amount of direct solar radiation on cattle.
He says it will help farmers make those day-to-day decisions about how to care for the cows.
"How do I change my paddock rotation? Should I have the sprinklers on in the dairy in the morning as well as the afternoon milking," he said.
"How hot it is and what the relative humidity is, the amount of wind, the amount of air movement because that really helps with evaporation."
© ABC 2012
16:38 EST Organisers of the Mulga Bill Quick Shear at Yeoval, in Central West New South Wales on the weekend, were a bit nervous about the weather on Saturday morning; there'd been good rain on Friday night and they didn't have a 'Plan B' if things didn't clear up.