. A study of selections for the variation and inheritance of the size, shape and color of hens' eggs ... nvolvedby the size of the dams body restricting the size of egg which can possiblybe produced, without regard to any inherited tendencies. A hen witha large body can produce a small egg, but a hen with a small body cannotso readily produce a large egg. The question of the inheritance of egg shape may not be entirely freefrom the physiological complications involved in the study of egg opinion is borne out by figure 16. The dam seems to have nearly60 per cent of the influence on th
. A study of selections for the variation and inheritance of the size, shape and color of hens' eggs ... nvolvedby the size of the dams body restricting the size of egg which can possiblybe produced, without regard to any inherited tendencies. A hen witha large body can produce a small egg, but a hen with a small body cannotso readily produce a large egg. The question of the inheritance of egg shape may not be entirely freefrom the physiological complications involved in the study of egg opinion is borne out by figure 16. The dam seems to have nearly60 per cent of the influence on the progeny. The fact that the two longparents have a somewhat higher percentage of the progeny followingtheir type than do the two round parents, would lead to the theory that 226 Earl W. Benjamin the length character is somewhat predominant over the width; other-wise one would expect to find more than 50 per cent of round progenywhen both sire and dam are round. Both the size and the shape of the egg seem to be about equally trans-mitted to the progeny by the dams and by the sires. These two factors. Round sireLong dam Long sireRound dam Round sireRound dam Long sireLong dam Fig. 16. relation of progeny shape characters to sire and dam The white area in each case designates the proportion of progeny showing the same character as that of the sire appear, however, to be independent, as is shown by an entire lack ofcorrelation between them (Benjamin, 1912). Such a condition as isfound here is the reverse of what might be expected if the results obtainedby other workers (Pearl and Curtis, 1916) on Barred Plymouth Rockswere borne out with the strain of White Leghorns used in these experi-
Size: 3394px × 736px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpoultry, bookyear1920
