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一只帕多瓦种的母鸡,在靠近帕尔马城的一所农庄里出生长大,它有个毛病:生出的鸡蛋的蛋壳很容易碎。原因在于其它的母鸡都吃小石子和石灰微粒,所以它们生下的鸡蛋壳都结实;而它只吃小麦、高粱和玉米粒,或者吃小虫子。它吃的虫子有玫瑰色的、黑色的和其它各种颜色的,它从采不吃小石子和石灰微粒,因为它消化不了。要是偶然吃下去一颗石子,那石子就整天呆在它的胃里了,而且使它整夜合不上眼。所以,它生的鸡蛋壳很容易破碎。
A Padova breed of hens grew up in a farm near Parma city. It had a problem: the egg shells of the eggs produced were very fragile. The reason is that other hens eat pebbles and lime particles, so they have strong eggshells; they only eat wheat, sorghum and corn kernels, or eat small bugs. The insects it eats are rosy, black and other colors. It does not eat pebbles and lime particles because it cannot digest. If he accidentally eats a stone, then the stone will stay in its stomach all day and it will make it impossible to keep up with the night. Therefore, the egg shell it produces is very easy to break.