File:A study of selections for the variation and inheritance of the size, shape and color of hens' eggs (1920) (14804407633).jpg

Identifier: cu31924101523425 (find matches)
Title: A study of selections for the variation and inheritance of the size, shape and color of hens' eggs
Year: 1920 (1920s)
Authors: Benjamin, Earl W. (Earl Whitney), b. 1889
Subjects: Poultry Eggs Variation (Biology) Heredity
Publisher: Ithaca, N.Y.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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Text Appearing Before Image:
66 .71 76 81 86 91 96 101 Fig. 22. variation of shape, by weekly averages, of eggs produced by dam fortwo years and bt progeny during early pullet production The heavy horizontal line in each division represents the character of the parent egg incubated; theheavy curve represents the production of the chick hatched; the light curve represents the productijnof the progeny of the chick. The dotted lines indicate that no eggs were produced during the periods whichthey cover The color character has a much higher coeflBcient of variabiKty, as maybe observed from figures 24 and 25. The pullets included in figure 24were all of the brown-egg type, but in figure 25 both brown-egg and white-egg types are shown. In these figures there seems to be a tendency forthe type of egg produced by the original pullet hatched, and her lateroffspring, to resemble the original egg incubated. The writer can explainthe negative or practically zero correlation for the color character in the 248 Eael W. Benjamin
Text Appearing After Image:
Pig. 23. shadow photographic record of relation between shape of egg incu-bated AND shape of eggs PRODUCED BY THE RESULTANT CHICK Each row of progeny production shows twelve eggs, which were selected at regular intervals during therespective years production. All eggs were photographed each year, bat only twelve eggs for each yearcould be represented in this group Study of Selections foe Size, Shape, and Color of Hens Eggs 249 data previously reviewed, only by the high coefficient of variabihty andthe probabihty that many abnormal eggs are incubated instead of thenormal type for the respective dam. Color . 16- . 1 1 ■ ■ : : . 1 1 1 , 1. 1 1 ! 1 IS- . 3 I \\,ii.^.jyM^^J^if,.^^ ;/>^V^\^/V\, 1 15- I. 6- — »*■ ^J— lUEM^j Y -If. 1- 1 ; : 20 24 28 1 5 9 18 17 21 25 39 2 0 10 14 IS 26 1 5 9 IS 17 21 December March 29 2April jBnuary February Pig. 24. variation of color of successive eggs laid during early pullet production The squares blocked in black indicate the days on which

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