. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. CHANGES IN EGG PRODUCTION. 115 Table I and Fig. 3.) Although there is a fascinating problem involved in attempting further selection for earlier maturity, such an endeavor is not consonant with the main project. Changes in Length of the Initial Cycle and its Complement, the Winter Pause. In the station strain of Rhode Island Reds, many individuals produce an initial series of eggs which is followed by a rest period, the winter pause. The trait does not lend itself to ordinary statistical treatment because of its nature, w
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. CHANGES IN EGG PRODUCTION. 115 Table I and Fig. 3.) Although there is a fascinating problem involved in attempting further selection for earlier maturity, such an endeavor is not consonant with the main project. Changes in Length of the Initial Cycle and its Complement, the Winter Pause. In the station strain of Rhode Island Reds, many individuals produce an initial series of eggs which is followed by a rest period, the winter pause. The trait does not lend itself to ordinary statistical treatment because of its nature, which depends partly on an inherent condition of the strain, and partly on environmental conditions, particularly those 30 25. 10-5 505 90-5 I3ft5 \10S 2105 250 5 EGGS Fig. 11.—Frequency Polygons showing the Percentages of Flocks laying the Given Number of Eggs per Year. The curve for 1913-14 is that of the 59 birds kept through the year. (See Table II.) that determine the time of year when the birds begin to lay. Further, it is possible that more than one cycle is involved. The present discussion, therefore, is limited to a general descriptive treatment of the subject, based on experiences with flocks subsequent to those studied in an earlier paper (Goodale, 1918). It is now clear that the earlier a pullet begins to lay in the autumn, the more likely she is to exhibit the winter pause. A few early laj^ers, however, go through the entire winter without pausing. Roughly speaking, 90 per cent of pullets lajdng their first egg early in the season (September) ex-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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