The relationship between clutch-size, brood-size and nutritional condition in Imperial Eagle nestlings in Doñana National Park (southwest Spain) was studied during 1986–¸88. Urea and uric acid level in blood were used to determine nutritional condition. Clutch-size, brood-size and hatching date were closely related to the physiological condition of nestlings, with the largest and earliest broods being better nourished. Sex and size order in the brood had no significant effect on nestling nutritional condition. These results suggest that well nourished females produce more numerous and better nourished nestlings.
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Miguel Angel Ferrer (1994) studied this question.
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