Table 2.

Chicken egg, body, and heart masses at 90% of development (day 19) after incubation in 21% O₂ or 15% O₂

	Control Incubation	Hypoxic Incubation
Egg, g	51.2 ± 0.9 (12)	52.9 ± 1.0 (14)
Body, g	26.5 ± 0.5 (13)	21.2 ± 0.4 (14) *
Heart, μg	149.2 ± 4.0 (13)	138.1 ± 5.4 (14)
Relative to body, μg/g	5.63 ± 0.16 (13)	6.60 ± 0.34 (14) *
Left ventricle, μg	33.7 ± 1.8 (9)	35.9 ± 1.9 (8)
Relative to body, μg/g	1.27 ± 0.07 (9)	1.78 ± 0.12 (8) *
Septum, μg	32.9 ± 1.6 (9)	29.7 ± 2.8 (8)
Relative to body, μg/g	1.24 ± 0.07 (9)	1.46 ± 0.13 (8)
Right ventricle, μg	32.0 ± 1.8 (9)	28.8 ± 1.8 (8)
Relative to body, μg/g	1.21 ± 0.07 (9)	1.42 ± 0.08 (8)

Data are presented as means ± SE; (n = number of chickens). Egg mass was measured when eggs were set.

^*P < 0.05 compared with control by unpaired t-test.