The Correlation Between Age at the Laying of the First Egg and the Weight of Eggs During the First Laying Year in White Leghorns

Abstract

It was shown in an earlier paper, (Lippincott, 1921) 1 that the correlation between age at the laying of the first egg and the mean weight of the first ten eggs laid by each of 123 Single Comb White Leghorn pullets was of a high order (r = 0.7139 ± .0293). Quite recently Jull (1924) 2 has calculated the same correlation for 40 Barred Plymouth Rock pullets and found that r = 0.845 ± 0.030. Data are now available upon which to calculate the correlation between age at the laying of the first egg and the mean weight of eggs laid during each successive thirty-day period of the 360 days following the onset of laying, for 60 Single Comb White Leghorns. MATERIAL The birds serving as the source of these data belonged to the pedigreed and somewhat inbred flock of Kansas State Agricultural College. They comprised a selected group, from an original . . .