This is an old post but just in case others are interested. When chickens are young their egg producing systems haven't got the hang of it yet and they may produce many variations of egg type's. Some may have double yoke's and others may be extremely large or be extraordinarily small.
Many year's ago A trucker that patronised the gas station I worked at brought down from A chicken farm in central Wisconsin cases of egg's that were unsellable because of the odd egg's that their young stock produced. Many of them had double yoke's. 2 dozen free egg's every week! Those were the day's!!!
This is an old post but just in case others are interested. When chickens are young their egg producing systems haven't got the hang of it yet and they may produce many variations of egg type's. Some may have double yoke's and others may be extremely large or be extraordinarily small.
Many year's ago A trucker that patronised the gas station I worked at brought down from A chicken farm in central Wisconsin cases of egg's that were unsellable because of the odd egg's that their young stock produced. Many of them had double yoke's. 2 dozen free egg's every week! Those were the day's!!!