Ground black pepper in feed?

[ChickenMamma]

My cousin just told me her dad always put black pepper in his chicken feed (she didn't say how much). Has anyone ever heard of this? What is it good for? How much would you use?

Thanks!

 

[Sir Birdaholic]

I've heard of cayenne pepper to boost egg production, & white pepper as a wormer. Maybe black pepper does one or both?