Roundabout system explained?

What exactly is the roundabout system? Heard it mentioned for racing hens.

How is it different from natural or widowhood?

Roundabout: hens move between two cocks on a schedule.

Week 1: Hen with Cock A
Week 2: Hen moved to Cock B, raced back to him
Week 3: Back to Cock A, raced back to A

The motivation is returning to the current mate. Creates drive without raising young.

Complex management but some swear by it for hens.