A strain of ms(5-6) segregating 1:1 for sterile and fertile plants were space planted, thinned to one plant per hill and harvested as steriles vs fertiles at four locations in 1986. At one location where bee activity was apparently low the fertiles produced 32% more seed cotton/plant than did the sib steriles. However, at the other three locations the sterile plants averaged 9.79% more seed cotton per plant, a 1.44% increase in percent lint which resulted in 11.11% increase in lint per plant. By contrast a CMS vs B line was grown at Athens, GA and the B line produced 39.8% more lint/plot than the A line. It is proposed that the genetic male sterile produces more lint per plant because of the savings in energy loss in pollen production.