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 = Т1 –Т0 / Т0, 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. |
- Pawlicki P, Duliban M, Tuz R, Ptak A, Milon A, Gorowska-Wojtowicz E, et al. Do G-protein coupled estrogen receptor and bisphenol A analogs influence on Leydig cell epigenetic regulation in immature boar testis ex vivo? Anim Reprod Sci. 2019;207:21-35.
- Tang W, Wu J, Jin S, He L, Lin Q, Luo F, et al. Glutamate and aspartate alleviate testicular/epididymal oxidative stress by supporting antioxidant enzymes and immune defense systems in boars. Sci China Life Sci. 2020;63(1):116-24.
- Zoels S, Reiter S, Ritzmann M, Weiss C, Numberger J, Schutz A, et al. Influences of Immunocastration on Endocrine Parameters, Growth Performance and Carcass Quality, as Well as on Boar Taint and Penile Injuries. Animals (Basel). 2020;10(2).
- Bielas W, Nizanski W, Nicpon J, Nicpon JE, Partyka A, Mordak R, et al. Effect of zearalenone on circulating testosterone concentration, testicular and epididymal morphology and epididymal sperm characteristics in wild boars. Theriogenology. 2017;102:59-66.
- Kotula-Balak M, Duliban M, Pawlicki P, Tuz R, Bilinska B, Plachno BJ, et al. The meaning of non-classical estrogen receptors and peroxisome proliferator-activated receptor for boar Leydig cell of immature testis. Acta Histochem. 2020;122(3):151526.
- Kucera H, Puschner B, Conley A, Berger T. Tissue steroid levels in response to reduced testicular estrogen synthesis in the male pig, Sus scrofa. PLoS One. 2019;14(4):e0215390.
- Lin Y, Wei D, Wang K, Wu, Zhang J, Che L, et al. Proteomic analysis reveals key proteins involved in arginine promotion of testicular development in boars. Theriogenology. 2020;154:181-9.
- Krejcirova R, Manasova M, Sommerova V, Langhamerova E, Rajmon R, Manaskova-Postlerova P. G protein-coupled estrogen receptor (GPER) in adult boar testes, epididymis and spermatozoa during epididymal maturation. Int J Biol Macromol. 2018;116:113-9.
- Stojanovic S, Uscebrka G, Zikic D, Stukelj M. Histological and morphometric examination of the testes of boars and male pigs immunocastrated with Improvac®. Acta Scientiae Veterinariae. 2017;45(1):7.
- Lents CA, Thorson JF, Desaulniers AT, White BR. RFamide-related peptide 3 and gonadotropin-releasing hormone-II are autocrine-paracrine regulators of testicular function in the boar. Mol Reprod Dev. 2017;84(9):994-1003.
- Ng’eno AK. Effects of two endocrine disrupting compounds (17β-estradiol & alkyphenol) in Nairobi river-water on boar testicular descent and seminiferous epithelium: University of Nairobi; 2017.
- Shen H, Fan X, Zhang Z, Xi H, Ji R, Liu Y, et al. Effects of elevated ambient temperature and local testicular heating on the expressions of heat shock protein 70 and androgen receptor in boar testes. Acta Histochem. 2019;121(3):297-302.
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