Stewart P A, Washburn K W
Poult Sci. 1984 Apr;63(4):600-6. doi: 10.3382/ps.0630600.
The bases for differences in growth and metabolism of lines previously selected for divergence in O2 consumption in comparison to a randombred control population were studied. Body weights, carcass fat, plasma growth hormone (GH), triiodothyronine (T3), thyroxine (T4), malic enzyme, and citrate cleavage enzyme activities were determined. The early growth of the low O2 birds was greater than the high O2 birds, whereas the growth rate of the control population was intermediate to, but not statistically different from, the two O2 lines. Six-week body weights did not differ between the lines. Percent fat of the high O2 birds was less than the other two lines at 1 and 2 weeks of age but greater than the low O2 birds at 3 weeks of age. Percent fat did not differ between the lines at 6 weeks. Plasma T4 levels differed between the lines only at Day 1, when the control population exhibited greater T4 levels than the O2 lines. Plasma T3 levels were lower in the high O2 chicks in comparison to only the control chicks at 0, 1, and 2 weeks of age. No line differences in T3 levels were detected at 3 or 6 weeks. From 1 to 3 weeks, GH levels were greater in the low O2 birds than the high O2, while the control birds had GH levels intermediate to the O2 lines. By 6 weeks, the O2 lines had similar GH levels, but these levels were lower than those of the controls. No consistent line differences in malic enzyme or citrate cleavage enzyme activities were observed.
研究了与随机交配对照群体相比，先前因耗氧量差异而被选择的品系在生长和代谢方面存在差异的基础。测定了体重、胴体脂肪、血浆生长激素（GH）、三碘甲状腺原氨酸（T3）、甲状腺素（T4）、苹果酸酶和柠檬酸裂解酶活性。低氧鸟类的早期生长大于高氧鸟类，而对照群体的生长速率介于两个氧品系之间，但在统计学上无差异。各品系六周时的体重无差异。高氧鸟类在1周龄和2周龄时的脂肪百分比低于其他两个品系，但在3周龄时高于低氧鸟类。各品系在6周时的脂肪百分比无差异。血浆T4水平仅在第1天各品系间存在差异，此时对照群体的T4水平高于氧品系。在0、1和2周龄时，高氧雏鸡的血浆T3水平仅低于对照雏鸡。在3周或6周时未检测到T3水平的品系差异。从1周到3周，低氧鸟类的GH水平高于高氧鸟类，而对照鸟类的GH水平介于氧品系之间。到6周时，氧品系的GH水平相似，但低于对照。未观察到苹果酸酶或柠檬酸裂解酶活性的一致品系差异。
