Seasonal variation in thyroidal 131i uptake and thyroxine secretion rate in buffalo (Bubalus bubalis)
Prakash, P.; Sharma, D.
Acta Veterinaria Academiae Scientiarum Hungaricae 25(4): 369-375
1975
ISSN/ISBN: 0001-7205 PMID: 1233880 Document Number: 90888
The seasonal variations in thyroidal uptake of 131I (UT) and thyroxine secretion rate (TSR) in buffalo calves of different age groups of both sexes were determined. The percent UT in the male buffalo calves increased from 28 to 40 from summer to winter; in female calves the variation was from 25 to 37. The peak UT values were obtained at 36 h during winter, and at 42 h during autumn and summer. The mean values of the daily TSR showed an increase from 0.29 to 0.60 mg/100 kg body weight from summer to winter in the male buffalo calves of different age groups. An increase from 0.30 to 0.62 mg/100 kg body wt was observed in the female calves. A reduction in TSR values due to advancing age was noticed in buffalo calves of both sexes during different seasons.