The Effect of Induced Hypothyroidism on the Genetics of Growth in the Chicken ,

Heritability of Body Measurements in Turkeys ,

“…Shoffner and Sloan (1948) give a heritability estimate of 75 percent for the body and Schaffner (1951) in chickens was somewhat lower than those reported by the other workers. Their estimates based on 4S/(A+D + S)f lie between 0 and 26 percent, while the 2(D + S) /(A+D + S) values ranged from 21 to 54 percent, depending on sex and age.…”

Weighted least squares estimates of genetic parameters in chickens

“…The heritability estimates of shank length are in the same range as those estimated for body weight (Lerner et ^., 1947, El-Ibiary and Shaffner, 1951, Abplanalp et ^., 1960. Casey (1970) found an average heritability of 0.44, 0.39 and 0.49 for shank length, condition index (BW/SL) and housing body weight, respectively.…”

Estimation of performance efficiency in the laying hen

“…The reported heritability estimates are in the same general ranges as those reported for body weight. Prom the New Hampshire breed, estimates have been 0.49, O.5I and 0.41 (Lerner et , 1947;El-Ibiary and Shaffner, 1951;Abplanalp e^^., i960). An estimate of 0.45 was obtained from five years of data from a randombred strain of meat-type fowl (Merritt, I966).…”