Zarei M A, Farshad A, Akhondzadeh S
Department of Biological Sciences, Faculty of Basic Sciences, University of Kurdistan, Sanandaj, Kurdistan, Islamic Republic of Iran.
Pak J Biol Sci. 2009 Nov 1;12(21):1420-4. doi: 10.3923/pjbs.2009.1420.1424.
The aim of this study was to determine the profile of changes in T3, T4 and TSH levels during breeding season and estrous cycle in Markhoz (Angora) Goats. Whereas the peaks of T3 were recorded in January, concentrations of T4 and TSH were highest in October. Variations in T3 and TSH concentrations among the different months of experiments period were not significant, although T4 concentration was significantly higher during September, October and November in comparison to December and January. Weekly variations in serum T4 and TSH concentrations were directly correlated to the changes in photoperiod and temperature. Monthly variation in serum T3 and TSH did not have a significant (p>0.05) relationship with the changes in photoperiod and temperature, but there was a highly significant positive relationship between serum T4 and temperature. This study showed that T4 concentration was high in the early phase but decreased in the late phase of the breeding season, but T3 and TSH concentrations varied markedly from week to week. However, it appears that weekly rhythms are controlled by photoperiod and temperature because, changes in these factors resulted in different profiles of both T4 and TSH, but there was not any correlation between T3 and those factors.
本研究的目的是确定马尔霍兹（安哥拉）山羊繁殖季节和发情周期期间T3、T4和TSH水平的变化情况。T3的峰值出现在1月，而T4和TSH的浓度在10月最高。实验期间不同月份T3和TSH浓度的变化不显著，尽管与12月和1月相比，9月、10月和11月的T4浓度显著更高。血清T4和TSH浓度的每周变化与光周期和温度的变化直接相关。血清T3和TSH的每月变化与光周期和温度的变化没有显著（p>0.05）关系，但血清T4与温度之间存在高度显著的正相关关系。本研究表明，繁殖季节早期T4浓度较高，但后期降低，而T3和TSH浓度每周变化明显。然而，似乎每周节律受光周期和温度控制，因为这些因素的变化导致了T4和TSH的不同变化情况，但T3与这些因素之间没有任何相关性。
