Sechman A, Paczoska-Eliasiewicz H, Rzasa J, Hrabia A
Department of Animal Physiology, University of Agriculture, Kraków, Poland.
Folia Biol (Krakow). 2000;48(1-2):7-12.
The concentrations of ovarian steroids (estradiol--E2, progesterone--P4 and testosterone--T) and thyroid hormones (thyroxine--T4 and triiodothyronine--T3) were determined in blood plasma of the domestic hen during sexual maturation and the initial period of egg lay. Blood samples were collected from Hy-Line pullets at 3 day intervals from days 87 to 144 day of life, i.e. 42 days before and 14 days after the onset of egg lay (OEL). Ovarian and thyroid hormones were measured by RIA methods. During sexual maturation an increase in ovarian steroids in the blood plasma was observed. The maximum E2 and P4 levels were recorded on day 6 and day 3 prior to OEL, respectively. In the case of plasma T level, an increase from 42 to 18 days before OEL followed by a decrease and a renewed increase from day 9 till OEL was observed. The relatively unchanged plasma level of T4 until day 9 before OEL decreased significantly just before the first oviposition while the T3 level gradually decreased between day 42 and day 9 before OEL, and then increased and again decreased from day 3 before till day 3 after OEL. During sexual maturation the following statistically significant coefficients of correlation between ovarian steroids and T3 were found: E2 vs. T3-->r = -0.551 and P4 vs. T3-->r = -0.373. There was no significant correlation between T and T3 or between the examined steroids and T4. The data obtained indicate that during sexual maturation of the domestic hen there is a negative relationship between the ovary and the thyroid gland.
在性成熟和产蛋初期，测定了家鸡血浆中卵巢类固醇（雌二醇 - E2、孕酮 - P4 和睾酮 - T）和甲状腺激素（甲状腺素 - T4 和三碘甲状腺原氨酸 - T3）的浓度。从海兰蛋鸡雏鸡出生后第 87 天至 144 天，每隔 3 天采集一次血样，即产蛋开始前 42 天和产蛋开始后 14 天。采用放射免疫分析法测定卵巢和甲状腺激素。在性成熟过程中，观察到血浆中卵巢类固醇增加。E2 和 P4 的最高水平分别记录在产蛋开始前第 6 天和第 3 天。就血浆 T 水平而言，在产蛋开始前 42 天至 18 天升高，随后下降，从第 9 天直至产蛋开始又再次升高。在产蛋开始前第 9 天之前，T4 的血浆水平相对稳定，在首次产卵前显著下降，而 T3 水平在产蛋开始前第 42 天至第 9 天逐渐下降，然后在产蛋开始前第 3 天直至产蛋开始后第 3 天升高，随后又下降。在性成熟过程中，发现卵巢类固醇与 T3 之间存在以下具有统计学意义的相关系数：E2 与 T3→r = -0.551，P4 与 T3→r = -0.373。T 与 T3 之间或所检测的类固醇与 T4 之间均无显著相关性。所获得的数据表明，在家鸡性成熟过程中，卵巢与甲状腺之间存在负相关关系。
