Effect of age and season on the thyroid hormone activity of Mizoram strain female mithun (Bos frontalis)

Lalsangpuii,; Ali, M. Ayub; Devi, Latha; Behera, Parthasarathi; Ralte, Lalsanglura

doi:10.14202/vetworld.2015.1375-1378

Cited by 5 publications

(1 citation statement)

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“…The obtained data confirm the presence of high concentrations of circulating T 3 and T 4 hormones in calves, previously reported in the calves and heifers of Bos frontalis [30,31], and during the first 6 months of life [32]. Furthermore, the highest concentration of T 3 observed at 10 days in calves and then decreasing with advancing age is in accordance with Garg et al [30] and Lalsangpuii et al [31] showing a probably adaptive mechanism to overcome the stressful period compared to other age periods; it is therefore reasonable that a decreased T 3 metabolic clearance occurred, due to low capability of its degrading enzymatic system observed in heifer [31] and/or to lower metabolic load [32].…”

Section: Discussionsupporting

confidence: 91%

Age-related functional changes of total thyroid hormones and glycosaminoglycans in growing calves

et al. 2020

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Background and Aim: During the physiological growing, thyroid and proteoglycan glycosaminoglycan (GAG) changes dynamically occur, according to genetic and non-genetic factors. The purpose of this research was to compare the effects of early postnatal development (10 days) until 210 days of life on the triiodothyronine (T3), thyroxine (T4), the relative T4:T3 ratio, and GAGs profile, and to define the different reference intervals of the calf's development through the various growing phases. Materials and Methods: The effect of growing on total thyroid hormones and GAG profiles was studied from 10 days to 210 days of age in 64 clinically healthy Brown calves, 30 males and 34 females. Blood samples were collected at 10, 20, 30, 60, 90, 120, 150, 180, and 210 days of age. Results: The results showed a significant effect of a calf's growth on T3, T4, and GAG values (p<0.0001). Significant correlations between T3 and T4 were observed. Compared to the previous time point, T3 showed a significant decrease at 20 days and at 60 days (p<0.01), while a significant increase was observed at 90 days and 210 days (p<0.05); T4 showed a significant decrease at 20 days (p<0.01), while significant increases were observed at both 180 days and 210 days (p<0.05); GAGs showed a significant increase at 120 days and 210 days (p<0.05). Positive and significant correlations between BW and GAGs in both males (p<0.0057) and females (p<0.0059) were observed. Conclusion: It can be concluded that the highest T3 and T4 concentrations have been associated with the early growing process (10 days), with an increasing trend also at 210 days, it is possible to hypothesize a probable metabolic effect of thyroid function in anabolic and/or catabolic directions during the calves' development. Likewise, it can be reasonably inferred that the highest plasma GAGs at 210 days may be due to their metabolic role during the development of growing calves. Taken together, these findings suggest the potential and relative contribution made by thyroid and GAGs effects on the dynamics of growing calves.

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Section: Discussionsupporting

confidence: 91%