Table 2 Ca intake (IN, g d^–1), Ca in the eggshell (OUT, g d^–1) and Ca OUT/IN of different hen genotypes (n = 3/genotype/rearing system) reared in enriched cages and free-range system.

Intake Ca (intake)

6.10^c

5.37^b

5.02^b

5.02^b

4.91^ab

4.31^a

6.02^c

5.73^bc

5.52^bc

5.60^bc

0.52

Output Ca (output)

5.72^e

5.90^e

2.94^b

2.68^b

2.75^ab

2.00^a

4.05^d

3.80^cd

3.88^cd

3.56^c

0.38

Ca output/intake

0.92^d

1.10^d

0.59^b

0.54^ab

0.57^ab

0.47^a

0.67^bc

0.67^bc

0.71^c

0.64^bc

0.08

Out/In corrected

0.92^d

1.00^d

0.59^b

0.49^ab

0.56^ab

0.43^a

0.67^bc

0.61^bc

0.70^c

0.57^bc

0.09