Several studies in the past have highlighted significant differences in sensitivity to heat stress between breeds and species. In particular, in the case of dairy cows, some researchers estimated genetic correlations ranging from -0.23 to -0.41 between resistance to heat stress and productive and reproductive traits (Ravagnolo et al., 2000, 2002).
This means that the exclusive selection for productive traits tends to select animals that are more sensitive to heat and humidity. Improving the functional traits of the herd will therefore indirectly increase the level of heat tolerance of the animals.
In December 2017, the first official index for heat stress resistance was published in Australia, a topic that soon became one of the objectives of the LATTeco project by ANAFIBJ. With the data release of April 2022, there will be significant news on this topic!