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Immune responses (mean ± 1 s.e.) of wood ducks (Aix sponsa) that hatched from eggs incubated at different temperatures (35.0°C, 35.9°C or 37.0°C). (a) Fold increase in foot web thickness of ducklings 24 h after exposure to phytohemaggluttinin (b). Antibody titres of ducklings exposed to sheep red blood cells (SRBC). Samples sizes are on graph.
