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Abstract
1. The effects of egg turning and fertility upon sodium concentration of albumen of the Japanese quail is described for up to 72 h incubation.
2. For incubated eggs the sodium concentration of albumen adjacent to the yolk sac was lower than that from albumen next to the shell. Static incubation increased the magnitude of this difference, such that albumen adjacent to the yolk sac was substantially depleted of sodium. This was found at the yolk equator and the yolk vegetal pole of both fertilised and unfertilised eggs.
3. Unincubated eggs also had a lower sodium concentration of albumen adjacent to the yolk sac compared with albumen next to the shell.
4. After 48 h of incubation yolk sodium concentration was substantially lower than albumen sodium concentration in both fertilised and unfertilised eggs, whether eggs were turned or not.
5. It is concluded that in unturned eggs the depletion of sodium from albumen adjacent to the vitelline membrane is not produced by ion transport processes but results from a passive movement of sodium into the yolk. Egg turning reduces the magnitude of the depletion of sodium from the albumen adjacent to the yolk sac by stirring the albumen, so permitting the full expression of ion and water transport across the blastoderm into the yolk sac.