Incubator Environment Interacts with Genetic Line of Broiler at the Plateau Stage to Affect Embryo Plasma Thyroxine and Triiodothyronine Concentrations

We hypothesize that temperature and oxygen in conjunction with genetic lines of broilers regulate embryo thyroid function. Thyroid response of broiler embryos of the two lines was measured at differen t incubator temperature and oxygen concentrations at the plateau stage in oxygen consumption (days 17 to 20 of embryo development). Each of the lines showed different eggshell conductance (G) values. Eggs of the same weight from the lines of broilers were incubated identically until the 17 day of development. On th