"Heat Stress In Dairy Calculator" - The software predicts and sets the threshold for heat stress on dairy cows.
The software gives accurate diagnoses of weather and heat stress on dairy cows based on:
1. Get regional weather data from the world's leading weather APIs: Open-meteo.com, Weatherapi.com,...
2: Provide heat stress warning according to current weather and solution direction.
3: Can accurately calculate the sub-climate of the barn when you provide data to the app
4: Can run offline or online by itself
5: Data is completely confidential, I do not collect any data. Using only precise location data to share and interact with weather APIs improves app performance and accuracy.
6. Data analysis based on formulas:
THI = 0.8*Tdb+ (RH/100)*(Tdb - 14.4) +46.4; (Mader 2003) (1)
Where:
Tdb dry bulb air temperature (°C)
RH relative air humidity(%)
THIadj = 4.51 + THI - (WS*1.992) + (0.0068*SR); (Maderet al 2006) (2)
where:
THI:temperature humidity index,
V:air velocity, m/s
SR:intensity of solar radiation, W/m2
Equations to the reduction of heat in barns for dairy cows at different heat stress level with applied cooling system (based on St-Pierre et al. 2003) From: Environmental parameters to improve of heat stress in dairy cattle—a review
System of fans or forced ventilation: ΔTHI = − 11.06 + (0.25∙Ta) + (0.02∙RH)
Combination of fans and sprinklers: ΔTHI = − 17.6 + (0.36∙Ta) + (0.04 RH)
High-pressure evaporative cooling system: ΔTHI = − 11.7 − (0.16∙Ta) + (0.18∙RH)
Where: THI decrease of the apparent THI due to the use of the cooling system, Ta ambient air temperature, °C, RH ambient relative air humidity, %
Threshold values of heat stress among cows based on CCI (based on Mader et al. 2010) From: Environmental parameters to improve of heat stress in dairy cattle—a review
Environment conditions: Hot conditions and Cold conditions
1. No stress : 25 °C < Tbd > 5 °C
2. Mild stress: 31 °C > Tbd > 25 °C and 6°C > Tbd > -1°C
3. Moderate Stress: 36°C > Tbd > 30°C and 0°C > Tbd > -6°C
4. Severe stress: 41°C > Tbd > 35°C and -5°C > Tbd > -11°C
5. Extreme stress: 46°C > Tbd > 40°C and -10°C > Tbd > -16°C
6. Extreme danger: 45°C< Tdb and Tdb<-15°C
The software gives accurate diagnoses of weather and heat stress on dairy cows based on:
1. Get regional weather data from the world's leading weather APIs: Open-meteo.com, Weatherapi.com,...
2: Provide heat stress warning according to current weather and solution direction.
3: Can accurately calculate the sub-climate of the barn when you provide data to the app
4: Can run offline or online by itself
5: Data is completely confidential, I do not collect any data. Using only precise location data to share and interact with weather APIs improves app performance and accuracy.
6. Data analysis based on formulas:
THI = 0.8*Tdb+ (RH/100)*(Tdb - 14.4) +46.4; (Mader 2003) (1)
Where:
Tdb dry bulb air temperature (°C)
RH relative air humidity(%)
THIadj = 4.51 + THI - (WS*1.992) + (0.0068*SR); (Maderet al 2006) (2)
where:
THI:temperature humidity index,
V:air velocity, m/s
SR:intensity of solar radiation, W/m2
Equations to the reduction of heat in barns for dairy cows at different heat stress level with applied cooling system (based on St-Pierre et al. 2003) From: Environmental parameters to improve of heat stress in dairy cattle—a review
System of fans or forced ventilation: ΔTHI = − 11.06 + (0.25∙Ta) + (0.02∙RH)
Combination of fans and sprinklers: ΔTHI = − 17.6 + (0.36∙Ta) + (0.04 RH)
High-pressure evaporative cooling system: ΔTHI = − 11.7 − (0.16∙Ta) + (0.18∙RH)
Where: THI decrease of the apparent THI due to the use of the cooling system, Ta ambient air temperature, °C, RH ambient relative air humidity, %
Threshold values of heat stress among cows based on CCI (based on Mader et al. 2010) From: Environmental parameters to improve of heat stress in dairy cattle—a review
Environment conditions: Hot conditions and Cold conditions
1. No stress : 25 °C < Tbd > 5 °C
2. Mild stress: 31 °C > Tbd > 25 °C and 6°C > Tbd > -1°C
3. Moderate Stress: 36°C > Tbd > 30°C and 0°C > Tbd > -6°C
4. Severe stress: 41°C > Tbd > 35°C and -5°C > Tbd > -11°C
5. Extreme stress: 46°C > Tbd > 40°C and -10°C > Tbd > -16°C
6. Extreme danger: 45°C< Tdb and Tdb<-15°C
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