How long does a roster have to be with hen for fertile eggs?

It seems you're asking about the time a rooster needs to be with hens for fertile eggs. Here's the breakdown:

The short answer is: A rooster doesn't need to be constantly with hens for them to lay fertile eggs. A single rooster can fertilize multiple hens.

The details:

* Fertilization happens during mating: The rooster doesn't need to be present when the hen lays the egg for it to be fertile. The fertilization process happens when the rooster mates with the hen.

* Sperm storage: Hens can store sperm from a rooster for several weeks, meaning she can lay fertile eggs for a period of time after mating even if the rooster is no longer present.

* Individual variation: The exact length of time a hen can store sperm varies depending on several factors:

* Breed: Some breeds are known to have longer storage times than others.

* Age: Younger hens may store sperm for a shorter period.

* Individual health: A healthy hen will generally store sperm longer.

* Environmental factors: Stress or changes in diet can also affect storage time.

General guideline: Most hens can store sperm for 10-14 days, but some may store it for as long as 21 days.

Important notes:

* One rooster is enough: A single rooster can typically fertilize all the hens in a flock.

* Don't overdo it: Over-mating can be harmful to hens, so ensure there's a balance.

If you're raising chickens for fertile eggs, it's worth observing your hens and learning how long they typically remain fertile after being with a rooster.