Changes in cow Heat stress
Thermal stress is defined as the point where the cow can not eliminate the appropriate amount of heat , in order to maintain the necessary physical thermal balance.
Thermal stress called so-called stress can cause to the animal some changes. These changes include:
- Increase body temperature
- Increased breathing rates
- Increased energy requirement for maintenance
Dairy cows activate maintenance mechanisms to remove excessive heat and of course maintain their body temperature. When the animal is in heat stress condition, the maintenance energy requirement increases by 20-30%. As a result, it reduces production functions such as milk production.
4.Exploitation of nutrients
Increased loss of sodium and potassium is usually associated with thermal stress. This is due to the losses associated with increased breathing rate.
5. Milk production
The reduction in milk production can be either temporary or long-term. Depending on the severity of thermal stress. If heat stress reduces milk production at the beginning of lactation, then milk production will be reduced. In later lactation cows can regain their strength.
The effects on reproduction may be prolonged and affect the animal for some months