M. Ayub Ali

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

Aim: The aim of the present study was to generate baseline data on the normal values of the thyroidhormone (TH) activity as well as their correlation with age and season. Materials and Methods: Blood samples (10 ml) were collected from jugular vein of 30 female mithun’s of three different age groups viz. Calves (6 months to 1 year), heifer (1-3 years) and adult (above 3 years) during the three season’s viz. Monsoon, winter and spring of a year. The serum was analyzed for thyroid stimulating hormone (TSH), triiodothyronine (T3), and thyroxine (T4) activity. Result: The result showed a significantly (p<0.05) a higher T3 level in heifers followed by adults and calves and higher T4 level in adults followed by heifers and calves in all the seasons. The TSH level was higher in heifers in all the seasons. The winter season recorded higher level of T3, T4, and TSH as compared to the other seasons of a year. Conclusion: The TSH and T3 level were the highest for aheifer, whereas T4 level was the highest for adults inall the season. Furthermore, the higher level of TH was observed in winter season. The increased level of the TH during the winter season signifies their calorigenic effect. Similarly in heifers, the increased T3 concentrations show its importance in reproductive physiology and its association with ovarian activity. This indicates that age and season have aprofound effect on TH activity of Mizoram strain female mithun.

Serum biochemical profile of Mizoram strain female Mithun (Bos frontalis) at different age and season

Abstract The present investigation aimed at generating baseline biochemical profile of Mizoram strain female mithun (Bos frontalis) at the age groups of calves (6 months to 1 year), heifer (1 to 3 years) and adult (above 3 years) during monsoon, winter and spring of a year. Glucose level was significantly (p ≤ 0.01) highest in heifers during monsoon season and lowest in adults in all the seasons. Protein level was significantly (p ≤ 0.01) highest during monsoon season in heifers and lowest in calves. Albumin level was significantly (p ≤ 0.01) highest in heifers and lowest in calves. Globulin and A: G ratio showed non-significant variation with age. Calves (23.05 ± 4.20) and heifer (23.13 ± 4.88) have significantly (p ≤ 0.01) higher urea concentration during winter and in adult (38.66 ± 1.35) during spring season. Creatinine level was highest in calves during monsoon which decreased significantly (p ≤ 0.01) with age in this season. Direct bilirubin level significantly (p ≤ 0.01) decreased as age increases and the highest concentration was observed during spring season. Total cholesterol, HDL-cholesterol and triglyceride level increased significantly (p ≤ 0.01) with age in all seasons with the highest values observed during winter season.