it is on top of their heads
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.
Red.
It is called a comb.
The cock comb, or crista galli, is an upward protrusion located on the top of a rooster's head. It is made of fleshy tissue and plays a role in communication and mating displays among chickens. The size and color of the comb can vary depending on the breed of the rooster.
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"