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Volume 61, issue 2 | Copyright
Arch. Anim. Breed., 61, 191-195, 2018
https://doi.org/10.5194/aab-61-191-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Original study 08 May 2018

Original study | 08 May 2018

Age-related changes in testicular parameters and their relationship to thyroid hormones and testosterone in male Murrah buffaloes

Vyankat Gangadhar Jadhav, Bagepalli Sathyanarayana Bharath Kumar, and Sujata Pandita Vyankat Gangadhar Jadhav et al.
  • Animal Physiology Division, ICAR-National Dairy Research Institute, Karnal, India

Abstract. The present study aims to investigate the age-related changes in testicular parameters and their association with plasma triiodothyronine (T3), thyroxine (T4), and testosterone in male Murrah buffaloes. Testicular measurements and single blood samples were collected from male Murrah buffaloes (n = 103) aged between 6 months and 8 years. The correlation coefficients of average testicular length (ATL), paired testis width (PTW), and scrotal circumference (SC) in relation to age were 0.88, 0.91, and 0.90, respectively. The regression equation between testicular weight (TW) and age was Y = 1.48 × x0.005 (r = 0.90; R2 = 0.79). Plasma T4 and testosterone increased significantly (p < 0.001) with age and their levels ranged between 12.9 and 41.8 and 0.05 and 1.48ngmL−1, respectively. With respect to associations between testicular parameters and plasma hormone levels, we observed significant (p < 0.01) correlations between ATL, PTW, SC, TW, and plasma T4. A significant correlation (r = 0.31; p < 0.01) between plasma T4 and testosterone levels was also observed. However, the correlations between plasma T3 and testicular parameters and plasma T3 and testosterone were non-significant. From the present study, we conclude that plasma T4 is positively correlated with testicular parameters and plasma testosterone, indicating its role in testis development and steroidogenesis.

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Developmental changes in testicular parameters and their association with plasma triiodothyronine (T3), thyroxine (T4), and testosterone in male Murrah buffaloes were determined. Plasma T4 and testosterone increased significantly with age. Plasma T4 levels were positively correlated with testicular parameters and plasma testosterone, whereas plasma T3 was not associated with either. This study demonstrated the developmental and steroidogenic effects of thyroid hormones on the testis.
Developmental changes in testicular parameters and their association with plasma...
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