The comb of a young rooster (cockerel) should start to show by the end of the first month and will grow much faster than the comb of a pullet. Keep in mind not all chickens have combs, it depends on the breed of chicken you have.
When they get the injections from a rooster's comb, the rooster does have to be killed. They can get rid of a rooster's comb without killing it but it has to be on the first day that it is born.
It's called a rose comb usually a rooster breed from Spain.
If they have a comb
The prepositional phrase in the sentence is "with the zigzag comb," which provides additional information about the White Leghorn rooster.
it is on top of their heads
Red.
It is called a comb.
A rooster's comb is mainly used for regulation of body heat.
The thing on a rooster's head is called a comb.
"With the zigzag comb"
A Leghorn rooster is a large white bird with a red comb.
"With the zigzag comb"