October 2017, № 11 (211), pages 88–92

doi: 10.25198/1814-6457-211-88

Eremenko V.I., Stasenkova Yu.V., Lebedeva N.V. FUNCTIONAL STATE OF THE ADRENAL CORTEX IN COWS OF DIFFERENT LINESFurther increase in milk production depends on the level of breeding work in dairy herds of cows. Studies of various authors found that the adaptive properties of the body of animals with an increase in the level of dairy productivity are reduced. A special role in the adaptation processes of the body is played by the adrenal cortex. Proceeding from this, the goal was to determine the level of cortisol and the functional reserves of the adrenal cortex in lactating cows of the 2nd lactation of the Simmental breed of the different lines Romulus, Redad, Haxle and Honig. The research was conducted in OOO “Protective” in the Shchigrovsky district of the Kursk region. The level of cortisol in the blood of cows of different lines showed that the lowest level was at the beginning of lactation and at 8 months. The maximum level of the hormone was noted on the 3^rd month of lactation (lactation peak). Between the concentration of cortisol in the blood and the level of milk productivity of cows of different lines a positive correlation is established r = 0.59–0.64. In the first half of the lactation, the concentration of cortisol was higher in Romulus cows compared to other lines, but these differences were statistically unreliable (P > 0.05). The results of functional loads on the adrenal cortex with the help of ACTH testify that the cows belonging to the Romulus line possess higher functional reserves of the adrenal cortex. The index of activity of the adrenal cortex (Iakne) was higher for them than for the line of Redad, Huxle and Honig and at lactations of 1.16 and 1.18 for 3 and 6 months, for the cows of the Rhedad line 1.03 and 1.10, for the Huxle line 1.00 and 1.09, at the Honig line 1.02 and 1.08. This indicates a higher adaptive capacity of the animal organism of the Romulus line, which allows us to recommend this line of cows for use in the dairy herd.Key words: lactating cows, cow lines, cortisol, functional load, adrenocorticotropic hormone (ACTH).

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About this article

Authors: Eremenko V.I., Stasenkova Yu.V., Lebedeva N.V.

Year: 2017

doi: 10.25198/1814-6457-211-88

Editor-in-chief

Sergey Aleksandrovich
MIROSHNIKOV

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