Has anyone crossed Marans with RIR's to make a more production style hen that lays a large, roundish, thick, darker brown egg? What crosses worked best? Was it worth it to get more eggs, but less color? How about a Wellsummer x RIR cross? Comments? I would like to develop a layer with great, moderately dark egg, that lays well thru the entire year, at least 5 eggs per week.