Maral does hormonal status during the rutting season depending on the use of estrus synchronization various schemes

The purpose of the study is to determine the hormonal status of marals during the rut. Objectives: to select the optimal stimulating drugs and synchronization schemes for red deer during the rutting period, to determine the hormonal status of red deer during the rutting period, depending on the synchronization schemes used. The studies were carried out the Novotalitskoye Experiment Station, Federal State Budget-Funded Scientific Institution, Charyshsky District, Altai Region, in 2019-2021. The object of the study were deer (n=100), the age ranged from 5 to 9 years, the animals were placed in separate fenced parks to prevent stag deer from accessing them. The sexual cycle of deer was synchronized with releasing hormones and prostaglandin (Ovsynch program), according to the SIDR - Synch protocol, and with progesterone, prostaglandin, and serum gonadotropin of in-foal mares. Synchronization schemes were carried out during the natural rut of animals (September); before artificial insemination, the deer were divided into nine groups. Artificial insemination of marals was carried out by the rectocervical method. Clinical changes in the form of the opening of the cervix were recorded in 20-83 % of the test animals at the time of artificial insemination, which indicates that the approved synchronization schemes are effective in red deer breeding. At all stages of preparation administration, the maral does were taken blood samples in order to determine the level of the hormones, such as cortisol, estradiol, progesterone, and testosterone. The level of the hormone cortisol at the time of artificial insemination ranges from 90.49 to 336.03 nmol/l, estradiol from 0.43 to 3.06 nmol/l. Progesterone is a more informative hormone for the introduction of drugs of synchronization schemes, it shows a significant difference both between groups of animals and between the days of blood sampling, while the level of progesterone in the blood of deer at the time of artificial insemination ranged from 1.84 to 8.67 nmol/l.