SCALING EFFECTS AND THE INHERITANCE OF JUVENILE BODY WEIGHT IN CHICKENS

Abstract

Data are presented for 10 generations of selection for high and low body weight at 8 weeks of age. The response of males was greater than that of females in the high weight line, but not in the low weight line. The asymmetrical response of sexes in the high weight line was eliminated by adjustment for scaling effects. Although heritabilities were greater in the high line than in the low line, they were essentially equal for both sexes within a line.