For the source text click/tap here: Pesachim 55
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One of the activities that might be restricted on erev Pesah involves an egg farmer who prepares nests or coops for his birds. The Mishna teaches that hens can be put on eggs to warm them for hatching on the 14th of Nisan; similarly, if a hen has abandoned her post on the eggs she can be returned to it, or if the hen dies another can be brought as a replacement. These activities are not true melakhot, but they do involve a certain amount of hard work to accomplish.
“Brooding” (degira in modern Hebrew) involves a complex hormonal change in the chicken that gets the bird to sit for weeks on end in a single place.
This leads us (on a wild ride admittedly) to the physiological basis for brooding in avians to broodiness in men and women, falling in love and the Byronic hero…..