1. Pullets that laid their first egg early in their laying year were generally of earlier sexual maturity than those which laid their first egg later in the year.
2. The time that the first egg was laid had a curvilinear association with winter egg production.
3. Birds that laid their first egg in September had the highest winter egg production.
4. Pullets that laid their first egg between the dates of Sept. 6 and Dec. 13 produced 50 or more eggs in the winter period.
5. There was a slight curvilinear association between the date of first egg and the rate of spring egg production.
6. The pullets that produced their first egg in December laid the greatest number of eggs during the spring period.
7. The poorest spring production was 58.4 eggs, the average of the birds that produced their first egg in March.
8. The records showed a curvilinear association between the date of first egg and total or annual egg production.
9. The pullets that laid their first egg in October produced the greatest number of eggs, 223.1
10. A production of 200 or more eggs was attained by those pullets that laid their first egg from Sept. 6 to Dec. 13.
Knox, C. W.
"Factors influencing egg production II. The influence of the date of first egg upon maturity and production,"
Research Bulletin (Iowa Agriculture and Home Economics Experiment Station): Vol. 10
, Article 1.
Available at: https://lib.dr.iastate.edu/researchbulletin/vol10/iss128/1