McNabb F M, Dunnington E A, Freeman T B, Siegel P B
Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg 24061.
Growth Dev Aging. 1989 Autumn;53(3):87-92.
Lines of chickens divergently selected for high (HW) or low (LW) 56-day posthatch body weight were evaluated for growth, development of small intestine, liver and pectoral muscle, and plasma T3 and T4 concentrations. Measurements were taken at 11,17, and 20 days of incubation and 5, 12, 20, 31, and 61 days posthatch. HW chicks and their organs were consistently larger than LW chicks and their organs from day 17 of incubation onward, and followed growth patterns characteristic of these lines. Significant line by age interactions indicated that chickens divergently selected for juvenile body weight had different temporal patterns for plasma T3 and for T4 from 11 days of incubation to 61 days posthatch. There were no differences between males and females within each line for either T3 or T4. There were no simple relationships between the patterns of plasma concentrations of either T3 or T4 and the pattern of growth of the body or the organs studied.
对孵化后56天体重经高（HW）或低（LW）向选择的品系鸡，进行了生长、小肠、肝脏和胸肌发育以及血浆T3和T4浓度的评估。在孵化的第11、17和20天以及孵化后第5、12、20、31和61天进行测量。从孵化第17天起，HW品系雏鸡及其器官始终比LW品系雏鸡及其器官大，并遵循这些品系的生长模式。显著的品系与年龄交互作用表明，经幼体体重向选择的鸡，从孵化第11天到孵化后61天，血浆T3和T4具有不同的时间模式。每个品系内雄性和雌性之间的T3或T4均无差异。血浆T3或T4浓度模式与所研究的身体或器官生长模式之间没有简单的关系。
