Bluebulb Projects' The Measure of Things presents:
4,500 is about 0.0000003 times the number of Chickens in the World.
In other words, it's 0.000000240 times the count of Chickens in the World, and the count of Chickens in the World is 4,200,000 times that amount.
(a.k.a. fowl) (Gallus gallus domesticus) (2011 figures) (average population)
The most numerous domesticated animals in the world, the estimated average population of chickens worldwide is 19 billion animals. Of these, about 6.4 billion birds produce the world's supply of chicken eggs.