Amounts (in ng) of testosterone (T), androstenedione (A4) and dihydrotestosterone (DHT) injected into A- and B-eggs.

The amounts were calculated in relation to total yolk androgen amounts (minimum, maximum and mean ± Standard Deviation (SD), in ng) previously measured in A- and B-eggs of southern rockhopper penguins. Injected amounts are also shown as SD units, based on the SD observed in the non-manipulated population, for each androgen (T, A4 and DHT) and egg category (A- and B-eggs).