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We first carried out an 8-day balance study with 8 laying hens fed ad libitum a low Ca diet (0.30 p. 100 Ca) and a maximum of 14 g/day/hen of seashells in order to study whether totally separate Ca feeding (SCF) would increase the corrected metaboliza- ble energy (cME) value of the diet and the retention of nitrogen, calcium and phosphorus. These experimental birds (group 2) were compared to 7 control birds (group 1) fed ad libi- tum a normal Ca diet (3.7 p. 100 Ca).
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Cabrera et al. (1982) studied this question.
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