Eggshells were weighed using a 0.001g precision scale. Eggshell weight was calculated via: Eggshell weight (g/100 g egg) = [Eggshell weight (g) / Egg weight (g)].
Data were subjected to ANOVA by using Minitab (2000). Duncan’s multiple range tests were applied to separate means (MstatC, 1980). Statements of statistical significance are based on probability of P