The Non-Linear Relationship of Egg Weight and Annual Production

Inheritance of Rate of Growth in Barred Plymouth Rocks

“…These results suggest a correlation between the body weight at eight weeks and egg weight. This correlation would be expected because of the association of the body weight at eight weeks with body weight at maturity and the association of mature body weight and egg weight found by Atwood and Clark (1930), Hall and Marble (1930), Marble (1930), and others.…”

Genetic-Economic Value in Selecting for Egg Production Rate, Body Weight and Egg Weight

“…The correlation of rate from December 1 to March 1 with March egg weight was +.075. Other investigators (Marble, 1930;Blyth, 1952), have found the relationship to be nonlinear, birds with very high and very low rates of production laying smaller eggs. Farnsworth (1956) found the average phenotypic correlation of total egg production and March egg weight in eight generations of Leghorns to be essentially zero.…”

A Statistical Study of Factors Affecting Egg Weight in the Domestic Fowl

“…Hadley and Caldwell (1920), Atwood (1923), Hall (1923), , Lohman (1924), Upp and Thompson (1927), Atwood and Clark (1930) and Marble (1930) have reported significant relationships between mean annual or maximum body weight and mean annual egg weight. Likewise, Atwood (1923), , Lohman (1924), Parkhurst (1926), Upp and Thompson (1927) and Atwood and Clark (1930) studied the relationship between mean annual egg weight and annual egg production but failed to find significant relationships.…”

“…Likewise, Atwood (1923), , Lohman (1924), Parkhurst (1926), Upp and Thompson (1927) and Atwood and Clark (1930) studied the relationship between mean annual egg weight and annual egg production but failed to find significant relationships. Marble (1930) pointed out that this relationship was significantly non-linear in nature and that these two factors were correlated to a small degree when the relationship was measured by means of the correlation ratio. The importance of days to maturity as an influencing factor has been found to be of medium to no value by such investigators as Atwood (1923, Lippincott, Parker andSehaumberg (1925) andParkhurst (1926).…”