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Abstract
1. Two groups of 4 hens at the end of their first production cycle were classified as producers of strong egg shells (>70 mg/cm2) and weak egg shells (<60 mg/cm2) on the basis of shell surface density.
2. Shell gland mucosa was homogenised and fractionated into nuclear, mitochondrial, microsomal and supernatant fractions, and ATPase activity determined.
3. ATPase activity in the total homogenate was significantly greater for hens producing strong shells (SES) than for hens producing weak shells (WES).
4. ATPase activities detected in the nuclear fraction, mitochondria and microsomes were significantly greater for SES than for WES birds.
Notes
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