1. Evidence on the value of stabilized Heterogen “ B” in reducing the incidence of blood spots in eggs. Unpublished data;Berruti,1961
2. Multiple range and multiple F tests;Duncan;Biometrics,1955
3. Dietary influence upon blood spots incidence;Sauter;Poultry Sci.,1963
4. The influence of dicumarol on the incidence of blood spots;Waldroup;Poultry Sci.,1962