1. Evaluation of egg shells as a low cost calcium source for laying hens;Arvat;Poultry Sci.,1973
2. Supplemental feeding of oyster shell to improve egg shell quality;Bezpa;Poultry Sci.,1974
3. The effect of environmental temperature, antibiotics and calcium source on egg shell quality;Charles;Poultry Sci.,1971
4. Multiple range and multiple F tests;Duncan;Biometrics,1955
5. Influence of dietary calcium levels, source and particle size on performance of laying chickens;Kuhl;Poultry Sci.,1977