Possible causes of my chicken's diarrhea.

[Luckybaby]

Since more than a week ago, my adult chicken have feces that is watery and the color is light green. The rooster who have sex with her also began having diarrhea that is watery and the color is white green and white since about a week ago. I thought my rooster and my hen just have that kind of poop because they're drinking a lot of water. However, when I look on the vent of the hen, I saw a lot of white and brown colored feces that stick to the feathers, and those didn't appear more than 3 weeks ago(even if she is drinking a lot of water on that time).

Both of them appeared normal and doesn't show any signs of illness except the diarrhea. My other chickens doesn't exhibit the same symptoms, and all of my chickens eat the same kind of food and live on the same environment. What are the possible cause of my chicken's diarrhea?

 

[WalnutHill]

You may want to post this in the health thread rather than incubation.

Have your birds been out on the lawn eating new green grass?

 

[Luckybaby]

You may want to post this in the health thread rather than incubation.

Have your birds been out on the lawn eating new green grass?

Can I transfer it to the health thread? They are in cage during the night and morning hours, but they are out at late morning hours until they roost.
I think there are more than enough fresh grass that they can eat everyday.

I have just copied it before starting a new thread on the disease section.