Differentiate eggs of poultry: Generally, eggs of round shape contain much yolk, those with rougher shell are fresher and those with thicker and stickier egg white are fresh.

• 细辨禽蛋：一般来说，形状较圆的蛋黄较多，壳越粗糙的越新鲜，蛋白较浓最及黏性较大的为新鲜的。