The question represents an ancient folk paradox addressing the problem of origins and first cause. Aristotle, writing in the fourth century B.C., would describe the problem. He concluded that this was an infinite sequence, with no true origin. Plutarch, writing four centuries later, specifically highlighted this question as bearing on a “great and weighty problem (whether the world had a beginning).” In the fifth century CE, Macrobius wrote that while the question seemed trivial, it “should be regarded as one of importance.
Alternatively, if the question refers specifically to the chicken egg as it exists today, the answer may be different. Chickens produce a protein, ovocleidin-17 (OC-17), that is expressed in the uterus and causes the formation of the thickened calcium carbonate shell around modern chicken eggs. Because OC-17 is expressed by the hen and not the egg, the bird in which the protein first arose, though having hatched from a non-reinforced egg, would then have laid the first egg having such a reinforced shell: the chicken would have preceded this first “modern” chicken egg. This is only the case, however, if OC-17 arose after the domestication of their wild-fowl ancestors gave rise to chickens.
A chicken coop usually has an indoor area where the chickens can sleep and nest, as well as a fenced-in outdoor area where chickens will feed and spend the majority of the day (which is typically made from chicken wire). The coop should be cleaned after every two weeks, and the straw shifted every day, similar to a litter box. At night, the coop should be locked with all the birds inside of it, so that they are protected from predators. Both the inside and outdoor floors of a chicken coop are often strewn with a loose material such as straw or wood chips to deal with chicken droppings and to provide ventilation.
The purpose of a chicken coop is to protect chickens from bad weather – heat, cold, wind and rain and secure them from predators-especially foxes and cats. One method to protect chickens is to put an isolation material between two layers of wood or bricks. As too much heat can prove to be fatal, windows should be oriented in such a way as to prevent overheating, and proper ventilation measures should be taken to prevent infectious bronchitis and overheating as well. The hens can be released outside by daylight but should be locked in a coop at night.