Burke W H, Marks H L
Poult Sci. 1984 Feb;63(2):207-13. doi: 10.3382/ps.0630207.
Plasma growth hormone (GH), triiodothyronine (T3), and thyroxine (T4) levels were compared in four lines of Japanese quail (C,P,T, and S) from 1 to 4 weeks of age in two experiments. Lines P and T were derived from line C by 59 generations of selection for high 4-week body weight. Line P was selected under the same nutritional regimen as line C (28% protein) while line T was selected under a restricted protein (20%) ration containing .2% thiouracil. Line S was developed as a subline from T by continuing the thiouracil stress but with the birds on 28% protein ration. Marked differences in body weight have resulted with C line birds being lightest followed by T,S, and P, line birds, respectively. There were significant line, age, and experiment differences in GH. Levels decreased with age in all lines. The GH levels of the largest and smallest (P and C) lines were higher than those of the intermediate-sized birds at 1 and 2 weeks of age but not thereafter. Levels of T3 decreased with age in Experiment 1, but in Experiment 2 they increased from 1 to 2 weeks and declined thereafter. In general, T3 levels of all three selected lines were lower than the control line with S and T being lowest and P intermediate.
在两项实验中，对1至4周龄的四系日本鹌鹑（C、P、T和S）的血浆生长激素（GH）、三碘甲状腺原氨酸（T3）和甲状腺素（T4）水平进行了比较。品系P和T是由品系C经过59代对4周龄体重的选育而来。品系P在与品系C相同的营养方案（28%蛋白质）下进行选育，而品系T在含0.2%硫脲嘧啶的低蛋白（20%）日粮下选育。品系S是从品系T继续施加硫脲嘧啶应激但日粮蛋白质含量为28%的情况下培育而成的亚系。体重出现了显著差异，C系鹌鹑最轻，其次分别是T、S和P系鹌鹑。GH存在显著的品系、年龄和实验差异。所有品系中GH水平均随年龄下降。最大和最小（P和C）品系在1周龄和2周龄时的GH水平高于中等体型的鹌鹑，但之后并非如此。在实验1中，T3水平随年龄下降，但在实验2中，T3水平从1周龄到2周龄升高，之后下降。总体而言，所有三个选育品系的T3水平均低于对照品系，其中S和T最低，P居中。
