A.A. Solomakhin, O.S. Mityashova, R.A. Rykov, A.A. Smekalova, I.Yu. Lebedeva
L.K. Ernst All-Russian Research Institute of Animal Husbandry, pos. Dubrovitsy, 60, Podol’skii r-n, Moskovskaya obl., 142132, Russian Federation
Abstract. We compared biochemical indicators of metabolism and endocrine profile during the second half of the first trimester of lactation of 39 first-calf cows of Holstein breed with different forms of ovarian hypofunction providing elimination of seasonal factors. The examination of animal reproductive systems and blood sampling for analysis were performed simultaneously, on a farm in Belgorod region. The cows were divided into groups according to the ovarian functional state, which was assessed by the rectal palpation technique and ultrasound investigation. Animals restored the sexual cyclicity were included in the group I (n = 24). Cows from the other groups did not express signs of a rut. Animals with ovaries containing one or several medium-sized follicles (no more than 8 mm) in the absence of yellow bodies were ascribed to the group II (the moderate form of ovarian hypofunction, n = 7). The group III (n = 8) included cows with the profound form of ovarian hypofunction that was confirmed by a decrease in the size of both ovaries containing no yellow bodies as well as follicles greater than 3–4 mm in diameter. In cows of groups II and III, the content of total cholesterol and phospholipids in the blood was 1.2-1.3 times lower than in the blood of group I cows (6.07 and 3.48 mmol/L, respectively). Furthermore, an increased (1.4 times) concentration of triglycerides and reduced (1.4 times) concentration of magnesium were found in the blood of animals of the group III as compared to animals of the group I (0.258 and 1.059 mmol/L, respectively). Serum levels of cortisol, thyroxine, and triiodothyronine (free and bound) were similar in animals from all groups. Thus, during the second half of the first trimester of lactation, the metabolic state of first-calf cows with ovarian hypofunction is characterized by a modified lipid metabolism that can be indirectly associated with the state of the thyroid system of the animals.
Keywords: milk cows, ovarian hypofunction, metabolism, metabolic hormones.
Author Details: A.A. Solomakhin, Cаnd. Sc. (Biol.), senior research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); O.S. Mityashova, Cаnd. Sc. (Biol.), senior research fellow; R.A. Rykov, research fellow; A.A. Smekalova, junior research fellow; I.Yu. Lebedeva, D. Sc. (Biol.), chief research fellow, head of laboratory (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).
For citation: Solomakhin A.A., Mityashova O.S., Rykov R.A., Smekalova A.A., Lebedeva I.Yu. Biochemical Indicators of Metabolism and Endocrine Profile of Cows with Ovarian Hypofunction during the First Lactation. Dostizheniya nauki i tekhniki APK. 2017. Vol. 31. No. 11. Pp. 59-63 (in Russ.).