Show vigorous hybrids in a study of hybrid vigor in poul try at kansas experiment station white leghorns Leg horns borns and rhode island reds were used in the pure breeda the mortality of the birds up tip to three weeks of age was 5 no 1 and CS 63 per CPU cent respectively valle N hile that of the b brids was 14 per cent the li of both sexes outgrew the pure tired bred offspring the mating of the leghorn males and red females produced more rop lilly growing offspring than those of the reciprocal cross |