3.1 VARIATION IN FIRST YEAR EGG PRODUCTION ANALYSIS OF STORRS DATA 36 +1 16 MEAN PRODUCTION VARIATION CONSTANTS GENERAL TREND OF EGG PRODUCTION THROUGH THE MIXE YEARS CHANGES IN MEAN FOWLS 51 JS 59 THE SEASONAL DISTRIBUTION OF EGG PRODUCTION ATE MONTHS 59 60 63 EGG PRODUCTION IN THE FOUR MAJOR SEASONS WINTER SPRING PAGE 65 67 72 73 74 74 SUMMER AUTUMN GENERAL CHANGES IN SEASONAL DISTRIBUTION OF EGG PRODUCTION 76 81 21 LIST OF FIGURES Fig. 1. Variation in annual egg production; nine year's rec ords. Fig. 2. Changes in mean annual egg production from 1911 to 1919. Fig. 3. Annual changes in the coefficient of variation from 1911 to 1919. Fig. 4. Annual changes in the percentage of pullets laying 104 eggs per year and less. Fig. 5. Annual changes in the percentage of pullets laying 210 eggs per year and more. Fig. 6 Monthly variation in mean egg production, nine years records. Fig. 7. Comparison of low and high producing pullets on the basis of monthly distribution of egg production. Fig. 8. Changes in the proportion of winter to annual egg production 1911-1919. LIST OF TABLES Table 1. Frequency distribution of all Wyandotte pullets on basis of annual egg production. Table 2. Summary of variation constants for annual egg production. Table 3. Constants of variation in first year egy production of Wyandottes at other places. Table 4. Relative frequency of low and high producers in the nine contests. Table 5. Distribution of total ere production by months and years. Table 6. Percentage distribution of total egy production by months and years. Table 7. Summary of monthly variation constants. Table 8. Monthly variation in the efficiency of erg produc tion, nine year mean. Table 9. Monthly distribution of total egg production by fecundity classes, nine year's records. Table 10. ('omparison of low, medium, and high producing pullets on the basis of monthly distribution of egg production. Table 11. Percentage of flock laying zero eggs in the separ ate months. Table 12. The seasonal listribution of egg production by years. Table 13. General trend of seasonal distribution of egg pro duction, 1911-1920. Appendix Table I. Raw data for annual egg production of Wyandotte pullets. Appendix Table II. Frequency distribution of egg produc tion in each month of the pullet year. Appendix Table III. Table for estimating significance of difThis is the first of a series of reports on egg production in the four chief breeds of poultry raised and kept in this country for egg production. ferences between annual means. The material studied consists of the individual trap nest records of all pullets completing a normal year's laying in the first nine international egg laying competitions held at Storrs Agricultural Experiment Station, Connecticut from November 1, 1911 to October 29, 1920. This and other bulletins to be published in this series will, therefore, constitute a summary of egg production in the nine contests, and will present the conclusions drawn from a detailed study of the records. The main facts established from a study of 903 Wyandotte records are: 1. Average egg production for the pullet year-159.3 eggs. 2. Average winter egg production (Nov. 1 to Feb. 28) 35.8 eggs. 3. Average spring egg production (Mar. 1 to May 31) 53.8 eggs. (June 1 to Aug. 31) 45.8 eggs. (Sept. 1 to Oct. 30) 24.1 eggs. 6. Highest individual year's record-308 eggs. 7. Lowest individual year's record–0 eggs. 8. Variability in individual egg production has remained high throughout the nine contests. (The coefficient of variation for the nine years was 28 per cent). 9. Average egg production has increased by about 7 eggs from 1911 to 1920. 10. The percentage of annual production occurring in the winter months has increased on the average by about 8 per cent. 11. The relative intensities of spring. summer, and autumn production have declined by a similar amount. 12. The percentage of high producers (birds laying 210 eggs and over) has increased slightly in the nine years. 13. The. percentage of low producers (birds laying 104 eggs and under) has decreased slightly in the nine years. 14. These tendencies toward improvement in the breed are more marked if two years of abnormal conditions and low records (1913 and 1918) are omitted. 15. There is no evidence in the records of separate seasonal cycles of egg production in this breed. 16. The improvement of the Wyandotte breed as egg pro ducers has been more rapid in England and the British Colonies and Dominions than in the United States. |
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