Abstract
1. Alkaline phosphatase, calcium and inorganic phosphorus plasma levels were determined in 18 free-living nestlings of Red Kite ( Milvus milvus) and 35 of Black Kite ( Milvus migrans), with ages between 16 and 54 days. We compared these values with those of 18 captive adults and subadults. 2. Levels of alkaline phosphatase increased until approximately 34 and 38 days for Red and Black Kite respectively and then suffered a reduction. These levels were clearly higher than those of adults and subadults. 3. Calcium and phosphorus levels were correlated with alkaline phosphatase activities in chicks of Red Kites but not in Black Kites. Age-related variations in these two parameters were similar to those of alkaline phosphatase in Red Kites, but we have not found any significant relation between age and calcium or phosphorus levels in Black Kite nestlings.
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