How did your chickens become

A man sat at a local bar and said: “This is a special day, l’m celebrating.” “What a coincidence”, said the woman next to him, “I’m celebrating, too”, she said and clinked glasses with him. “What are your celebrating?” the woman asked. “I’m a chicken farmer, and for years all my hens were infertile,

but today they’re finally fertile.” “What a coincidence”, the woman said, “For my husband and I have been trying to have a child. Today, my gynaecologist told me l’m pregnant! How did your chickens become fertile?”, she asked . “I switched cocks”, he replied. “What a coincidence”, she said.