Age-related changes in testicular parameters and their relationship to thyroid hormones and testosterone in male Murrah buffaloes
The present study aims to investigate the age-related changes in testicular parameters and their association with plasma triiodothyronine (T<sub>3</sub>), thyroxine (T<sub>4</sub>), and testosterone in male Murrah buffaloes. Testicular measurements and single blood samples...
Main Authors: | , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2018-05-01
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Series: | Archives Animal Breeding |
Online Access: | https://www.arch-anim-breed.net/61/191/2018/aab-61-191-2018.pdf |
Summary: | The present study aims to investigate the age-related changes in testicular
parameters and their association with plasma triiodothyronine (T<sub>3</sub>),
thyroxine (T<sub>4</sub>), and testosterone in male Murrah buffaloes. Testicular
measurements and single blood samples were collected from male Murrah
buffaloes (<i>n</i> = 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 <i>Y</i> = 1.48 × <i>x</i><sup>0.005</sup> (<i>r</i> = 0.90; <i>R</i><sup>2</sup> = 0.79). Plasma
T<sub>4</sub> and testosterone increased significantly (<i>p</i> < 0.001) with age and
their levels ranged between 12.9 and 41.8 and 0.05 and 1.48 ng mL<sup>−1</sup>, respectively.
With respect to associations between testicular parameters and plasma hormone
levels, we observed significant (<i>p</i> < 0.01) correlations between ATL, PTW,
SC, TW, and plasma T<sub>4</sub>. A significant correlation (<i>r</i> = 0.31; <i>p</i> < 0.01) between plasma T<sub>4</sub> and testosterone levels was also observed.
However, the correlations between plasma T<sub>3</sub> and testicular parameters
and plasma T<sub>3</sub> and testosterone were non-significant. From the present
study, we conclude that plasma T<sub>4</sub> is positively correlated with
testicular parameters and plasma testosterone, indicating its role in testis
development and steroidogenesis. |
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ISSN: | 0003-9438 2363-9822 |