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. 2021 Sep 1;76(3):649-657.
doi: 10.22092/ari.2021.355354.1676. eCollection 2021 Summer.

The Endocrine Function of Testes in 12- and 18-Month-Old Boars of Different Breeds

V I Eremenko  1 , A V Titovskii  1 , A A Manshin  2 , O S Dolgikh  2 , A V Golovastikova  2 , I F Velichko  3
Affiliations

The Endocrine Function of Testes in 12- and 18-Month-Old Boars of Different Breeds

V I Eremenko et al. Arch Razi Inst. .

Abstract

Testes have several primary functions, such as male gametes production (spermatozoa) and secretion of several endocrine factors, including the production of steroid and protein hormones which facilitate elements in the healthy reproductive function of mammals. The potential of an animal functional endocrine reservoir could be an interesting finding in animal reproduction management. Therefore, the current study aimed to analyze the functional endocrine reserves of testes in 12- and 18-month-old boars of four different boar breeds, namely Large White, Landrace, Duroc, and Tempo, as the animal model in this research (n=10). To determine the functional endocrine reserves of the testes at 12 and 18 months of age, boars received injections of human chorionic gonadotropin (hCG) 3 times every 72 hours. Testosterone was measured in blood samples (10 mL) taken from the jugular vein before the administration of hCG as well as 2, 12, 24, 48, and 72 hours after administration of each of three hCG injections. The index of endocrine activity of the testes was determined by the formula: Ita = T1 -T0 / T0 , where Ita is the index of endocrine activity of the testes, T0 is the testosterone concentration before the administration of hCG, and T1 is the maximum testosterone concentration after the third administration of hCG. The effects of the hCG injection on boar testes at different age periods indicated that the testes of Large White and Duroc boars have higher potential endocrine reserves compared with the Landrace and Tempo breeds.

Keywords: Large White; chorionic gonadotropin; Duroc; Landrace; Tempo; boars; breeds; testosterone.

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Figures

Figure 1
Figure 1
Testosterone levels in the blood of 12-month-old boars following the 1st CG administration
Figure 2
Figure 2
Testosterone levels in the blood of 12-month-old boars following the 2nd hCG injection (given 72 h after the first round of hCG administration)
Figure 3
Figure 3
Testosterone levels in the blood of 12-month-old boars after the 3rd CG administration
Figure 4
Figure 4
Testosterone levels in the blood of 18-month-old boars after the 1st CG administration
Figure 5
Figure 5
Testosterone levels in the blood of 18-month-old boars after the 2nd hCG administration
Figure 6
Figure 6
Testosterone levels in the blood of 18-month-old boars after the 3rd CG administration
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