Track our heat stress monitor farms

Lallemand Animal Nutrition is working in partnership with Dr Tom Chamberlain on a project launched to provide real-time data on heat stress in cows.
The graphs show THI (Temperature and Humidity Index) for housed cattle and DHLI (Dairy Heat Load Index) for grazing situations. Hover your mouse over the graph for more accurate readings.

The below table outlines parameters for benchmarking THI and DHLI

Assessment Est. milk yield loss THI Scores DHLI Scores
None 0 l/day under 62 under 23
Moderate 0 – 2 l/day 62 to 72 23 to 36
High 2 – 4 l/day 73 to 79 37 to 46
Severe over 4 l/day over 79 over 46

See below for more information.

Graham Whitting – North Gloucestershire
No of cows: 600 Holstein
Calving pattern: All year round
Average yield cow/yr: 9,000

Chris Withecombe – North Devon
No of cows: 680 Holstein & Norwegian cross
Calving pattern: All Year Round
Average yield cow/yr: 10,400

Phil Nash – West Sussex
No of cows: 270 Holstein
Calving pattern: All Year Round
Average yield cow/yr: 10,600

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Carl Charney – Berkshire
No of cows: 475 Holstein
Calving pattern: All Year Round
Average yield cow/yr: 11,500

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Andrew Williams – Monmouthshire
No of cows: 220 Holstein Friesians
Calving pattern: All Year Round
Average yield cow/yr: 9,000

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David Hastie – East Lothian
No of cows: 600 Jersey
Calving pattern: All Year Round
Average yield cow/yr: 8,300

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Chris Stockdale – Yorkshire
No of cows: 170 Holstein
Calving pattern: Autumn
Average yield cow/yr: 10,400

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Dave Higgins – Shropshire
No of cows: 190 Holstein
Calving pattern: All Year Round
Average yield cow/yr: 9,800

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Download our heat stress
farmer testimonial

Uk & Ire landing page with PDF download option
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Click here to find out more about the farms

The above farms have agreed to take part in our joint heat stress monitoring project, the project involves each farm having two heat stress monitors on their farm, one in the housed buildings and the second in/around the grazing platform.

We will be monitoring the THI and DHLI on the farms throughout the summer and posting tips and advice for farmers to help manage heat stress.

You can also see some additional farms on Tom’s website by clicking the image below:

Click here to watch our heat stress videos or click image below to watch our 2021 Webinar from the start the project.