Nir I, Harvey S, Cherry J A, Dunnington E A, Klandorf H, Siegel P B
Poult Sci. 1987 Jan;66(1):32-7. doi: 10.3382/ps.0660032.
Plasma levels of growth hormone (GH), triiodotyronine (T3), and thyroxine (T4) were compared at 25 and 61 days of age in parental lines and F1 crosses between parental lines under ad libitum and alternate day feeding. Parental lines included White Rocks selected for high and low body weight and a White Leghorn population. Differences among populations for hormone levels were more pronounced at 61 than at 25 d of age. Growth hormone decreased and T4 increased with age in all populations except the line selected for low body weight, whereas the pattern for T3 varied with genetic stock. On days when chicks were not fed, plasma GH and T4 increased and T3 decreased. On days of feeding, GH and T4 returned to the level of chicks fed ad libitum while T3 was either identical to or higher than that for the ad libitum chicks. Population by feeding regimen interactions were not significant at either age for any of the hormones measured showing that responses to the feeding regimens were similar for all populations.
在自由采食和隔日饲喂条件下，比较了亲本品系以及亲本品系之间的F1杂交后代在25日龄和61日龄时的血浆生长激素（GH）、三碘甲状腺原氨酸（T3）和甲状腺素（T4）水平。亲本品系包括选择用于高体重和低体重的白洛克鸡以及一个白来航鸡群体。61日龄时各群体间激素水平的差异比25日龄时更为明显。除了选择用于低体重的品系外，所有群体中生长激素随年龄降低，T4随年龄增加，而T3的模式因遗传品系而异。在雏鸡不喂食的日子里，血浆GH和T4增加，T3降低。在喂食的日子里，GH和T4恢复到自由采食雏鸡的水平，而T3与自由采食雏鸡的水平相同或更高。对于所测量的任何一种激素，在两个年龄时群体与饲喂方案的相互作用均不显著，这表明所有群体对饲喂方案的反应相似。
