The Correlation between First- and Second-Year Egg Production in the Domestic Fowl.

INTRODUCTION. .......... ....................................................... Historical. ..................................................................... Materials and methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analysis of data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inter-annual correlation for total production in the flock as a whole.. . . . . . . . . . . . . . . Inter-annual correlation within the individual pens of the contest flock.. . . . . . . . . . . . Inter-annual correlation of flock means.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Correlation between the monthly records of one year and the annual record of another year.. ............................................................ Inter-annual correlation for monthly production.. ............................... Genetic significance of the inter-annual correlation for monthly production. . . . . . . . . Relationship between the condition of the birds with respect to laying activity during individual months of the first year and the annual record of the second year, with special reference to culling for second-year production.. ........................ DISCUSSION AND CONCLUSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L~~ERATURECITED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274 275 277 278 278 2 80 283