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Heat stress influences low conception of dairy herds
Date:9/6/2007

Although it has been described that hyperthermia in lactating dairy cows can occur at air temperatures as low as 27C, only maximum daily temperatures <20C led to a significant increase in fertility. It should be stressed that in our geographical area, the maximum temperature was only <20C for 170 days per year.

As an overall conclusion, climate factors seem to be highly relevant for conception rate. The use of maximum temperatures gives more information that the one provided by THI variables. Thus, the use of the THI or temperature to control a farm environment would depend on the individual farm and on each environmental situation, but it is important to check temperature and humidity to know when to adopt cooling measures. Further studies should try to establish the effect of global warming at the farm level. This problem is reflected with warm summers and even with peaks of temperatures in winter.


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Contact: Irina Garcia-Ispierto
Irina.Garcia@uab.es
34-935-811-091
Universitat Autonoma de Barcelona
Source:Eurekalert

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