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The relationship between incubation period and (a) plasma T4 concentration, (b) plasma T3 concentration and (c) plasma T3 : T4 ratio of ducklings sampled on days 0, 4 and 10 post-hatch. Eggs were incubated at either 35.0°C, 35.9°C or 37.0°C. n = 14–20 ducklings/age/incubation temperature. Error bars are ±1 s.e.m.
