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Power functions fitted to the relationship of embryo mass and adult survival to time. (a) Embryo growth curves for zebra finch, Taeniopygia guttata (b=1.98), Rhode Island Red chicken, Gallus domesticus (3.25) and gadwall, Anas strepera (4.47). (b) Survival curves for zebra finch (β=1.17) to red jungle fowl females, Gallus gallus (3.63) and gadwall (4.17). The straight lines are the ageing-related components of hazard functions for power (Weibull) models fitted to the survival curves.
