The egg had to come first, as the egg made the chicken. Geneticists found the answer. Check out the source.
Source(s):
http://www.cnn.com/2006/TECH/science/05/26/chicken.egg/

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The egg.
The first chicken hatched from its egg, thus it was a chicken-egg.
That egg was created and fertilized by a pair of what we can loosely call non-chickens.

Like all animals in the animal kingdom, chickens evolved from other animals. The animal that laid the first chicken egg was a non-chicken that mated with another non-chicken. The genetic material from the ovum and sperm of the original parent non-chickens combined to form the genetic combination that we would identify as being that of a chicken.

There could be some lively discussion about what genetically describes a chicken, but regardless, whatever you'd identify as the first chicken, you could identify its parents as being something that preceded chickens.

Despite the traditional use of "chicken and egg" as describing a paradox where one cannot determine which came first, the answer to this question has actually been well known ever since the modern science of genetics was developed by Gregor Mendel in the mid-nineteenth century.
Source(s):
http://en.wikipedia.org/wiki/Genetics

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the egg because even before chickens where on earth (because they came from the moon) lizards and what not had eggs. like dinasaus
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