Ruminants: calculate the THI index to assess the risk of thermal stress
In the event of thermal stress, ruminants suffer a lower feed intake, and their dairy and reproductive performances decline rapidly. Adding Bicar®Z to the rations during hot periods is essential to obtain a BACA level of 300 and 350 mEq / Kg of MS to compensate the animal’s physiological losses.
How can the risk of thermal stress be assessed?
More important than the outdoor temperature itself, the atmospheric temperature and humidity are a basic index used to measure potential heat stroke in animals.
Solvay has developed a THI – Temperature - Humidity Index calculator – enabling the risk of thermal stress to be assessed instantly.
THI = (1,8 x T + 32) - ((0,55 -0,0055 x HR) x (1,8 x T - 26))
T = temperature in °C and HR = relative humidity
This calculator is for information purposes only
If the THI is ≥72 (25°C and 50% relative humidity), then thermal stress occurs. In this case, 250 to 300g of Bicar®Z should be added to the ration.
Impact of the Temperature-humidity Index on ruminant reproduction
|>73||Sudden drop in fertility|
|>55||Start of decrease in fertility|