Last week in the UK (29/06/15 – 05/07/15) we had an unusually hot couple of days, at some points reaching above 30°C. So here at eCow we decided to see if there was a correlation between ambient temperature (information from and internal rumen temperature (measured by the eBolus). Below is what we found.

Average (mean) daily rumen temperature displayed below shows a strong correlation with ambient temperature. Data collected from one cow in Somerset.

1226 Rumen and Ambient Temp

Drinking events (measured by observing the number of sharp drops in rumen temperature) also show some correlation with ambient temperature. Data from the same cow as above.

1226 Drinking Events

Our neighbours in France have been experiencing similar hot spells (to a slightly greater degree). Data from one cow from Paris showing a strong correlation between rumen and ambient temperature.

1102 Paris Rumen and Ambient Temp

As is evident, cow ruminal temperature rises with hotter weather, highlighting the need to monitor and protect cows when temperatures rise in order to prevent heat stress and reduced milk yields.

Each data point for rumen temperature is an averaged value of 96 recorded readings our bolus takes over a 24 hour period. And each reading the bolus records (every 15 mins) is an average of 15 readings taken at minute intervals.