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Heat Stress

Heat stress

Heat stress is most marked when it comes in short bursts with no time for the cow to adapt to the rising temperatures.

When heat stressed:

  • A cows’ feed intake milk yield decline. Intakes can decline by 10-30%.  Milk yield can decline by as much as 20%.
  • There will also be a reduction in fertility, including an increase in embryonic loss.
  • There is also evidence of an increase in the risk of clinical mastitis.

 

Minimise the effects of heat stress on animals

Water

  • Provision of clean drinking water is critical for all animals during hot weather
  • As temperatures rise, cows will drink up to 30% more water (in excess of 100 litres/day)
  • As they will need water more often, it is important that cows are not forced to walk long distances for water
  • If possible, make water available to cows before and/or after milking so that cows have their needs met

Shade from direct sunlight

  • Provide shade areas to allow cows to keep cool away from direct sunlight
  • Where possible, use paddocks with trees for shade or allow access to housed areas during the day
  • Reduce the time cows spend in holding yards to a minimum
  • Watch for sunburn, especially in white coloured cows, and keep these cows indoors day and night if required