The Improvement of New Hampshire Fryers

The Heritability of Egg Weight: The Advantages of Mass Selection and of Early Measurements

“…In view of these figures it seems that in the past we have tended to underestimate the c 2 factor in body weight. Parenthetically it may also be noted that when the data of Lerner, Asmundson and Cruden (1947) for the heritability of body weight in 12-week old New Hampshires was re-examined for maternal effects, a e 2 of .04 was found.…”

Yield improvement from a selection index technique with cotton

“…A method for estimating optimum relative weights has been given by Fairfield Smith (1936), Hazel ('943) and Lerner et al (1947) for various selection projects. More recently, Robinson et al (1951) have given procedures for estimating genotypic and phenotypic covariances required for the construction of a selection index.…”

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.…”