the natural flying system to my knowledge works around the natural breeding cycle of a pigeon from laying to chipping and various stages of a young bird , so at times you wouldnt be able to send the hen for laying , then you would have to leave one bird at home be it the cock or hen to attend the nest , then you would have to find the nest state the hen likes to fly to and then the cock , timing nests so eggs are chipping ectra to increase the birds effort ........................ and much more , but durring this time of nests ectra they are moulting and casting flytes so technicaly they have inferior uplift and down thrust due to the areodynamics of the wing and the strain that breeding whilst racing has upon them