Abstract
This article considers the influence of dairy cows productivity on heat stress with different types of stress resistance, divided according to the level of cortisol concentration in blood. The research has shown that in Holstein cows the level of cortisol varies in the range of 30,27–184,12 nmol/l. The division by types of stress resistance was carried out according to Sturges' rules. The obtained data indicate that high temperature range, or heat stress, significantly affects gross milk yields of dairy cows. At the same time, cows with low type of stress tolerance have the greatest share of influence on this decrease in gross milk yields
Keywords
References
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