Changes in climate conditions and their effects on production and reproduction of medium yielding cows in temperate continental climate

Abstract

The increased air temperature combined with the reduction of rainfall during hot season impairs the capacity of cows to maintain the optimal body temperature. This study tested the hypothesis that climate changes affect the medium yielding cows in temperate continental climate. The productive-reproductive parameters of 8607 milking cows from a dairy farm in North-eastern Romania were examined and correlated with changes in ambient temperatures and rainfall between the years of 1983 and 2010. We observed that the number of artificial inseminations served to cows showed a decreasing trend. The reduction in this parameter was significantly influenced by the increase in the average and maximum temperatures during hot season associated with the reduction in rainfall, as shown by regression analysis. Other studied parameters such as milk production, calving to conception interval, calving to first artificial insemination interval and conception rates at first, second and more than two services were not related to the changes in average annual temperatures, annual temperatures amplitude and annual precipitation quantities. This study suggests that, although present, the effects of climate changes on some productive-reproductive parameters of medium yielding cows in geographic areas with temperate continental climate are not as dramatic as described in other studies.

Problems of livestock reproduction with a focus on climate change

“…A decline in cow insemination efficiency in recent decades is associated with the increase in average and maximum temperatures and reduced rainfall (Borş et al 2019). Heat stress (HS) is a major problem.…”

“…The United States' losses run into hundreds of millions of dollars per year (Laporta et al 2020). However, this is not a critical issue for the middle-yielding cows in a moderately continental climate of Europe (Borş et al 2019).…”