Effect of heat stress on the day of breeding

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Impact of Heat Stress ..

Freie Universität Berlin, Clinic for Animal Reproduction:

 

The Conception rate ... is highly affected by heat stress

... The THI of 73 is the most likely threshold for the influence of heat stress on CR although negative effects of heat stress are apparent already at lower levels.

... The conception rate of lactating dairy cows in the moderate climate is highly affected by heat stress. The THI of 73 is the most likely threshold for the influence of heat stress on CR although negative effects of heat stress are apparent already at lower levels of THI. The CR of lactating dairy cows is negatively affected by heat stress both, before and after the day of breeding. The period from d 21 to d 1 before the day of breeding is most sensitive to heat stress. Thus, heat abatement strategies should maintain a low and constant THI to avoid fluctuations in heat stress over a period of at least 3 weeks before to 3 weeks after the day of breeding.

https://www.researchgate.net/publication/280523408_Impact_of_heat_stress_on_conception_rate_of_dairy_cows_in_the_moderate_climate