ДИНАМИКА ПРОГЕСТЕРОНА И ГОНАДОТРОПИНОВ В КРОВИ ТЕЛОК ПРИ СИНХРОНИЗАЦИИ ПОЛОВОЙ ОХОТЫ С ИСПОЛЬЗОВАНИЕМ УДЧ ДИОКСИДА КРЕМНИЯ

Abstract

The paper presents the results of studying the possibility of controlling the links of hormonal regulation of the reproductive cycle of cattle using silicon dioxide in an ultra-dispersed form to increase fertilization during frontal insemination. The aim of the study was to analyze the effect of silicon dioxide UDPs when used in the scheme for synchronizing the sexual cycle of heifers on the dynamics of progesterone, FSH and LH and the fertilization of animals from frontal insemination. The studies were carried out on breeding age heifers of the red steppe breed. We formed two groups by 10 heifers – the control and the experimental one. In both groups, the synchronization of estrus was carried out by double application of estrophan. In the experimental group, the animals were simultaneously injected with estrophan with a solution of silicon dioxide ultra-dispersed particles in isotonic sodium chloride solution (dose of silicon dioxide 10 μg/kg). Blood for the determination of hormones was taken from heifers on the 1st, the 11th and 14th days of the experiment. All animals were inseminated frontally with deep-frozen semen by the rectocervical method. It was found that in the experimental and control groups, the dynamics of gonadotropins during the induced sexual cycle was similar; however, the LH level before insemination in heifers of the experimental group exceeded that in the control by 0.81 ng/ml (34.4%). Fertility of heifers in the experimental group was 70.0%, in the control – 50.0%. The effect of silicon dioxide in the UDP form on the dynamics of sex hormones and the fertility of heifers from frontal insemination during estrus synchronization was studied for the first time.