Egg Characters Research Articles

Breed Variations in Egg Characters

THE egg of the domestic fowl is made up of a number of different parts. They are the shell, with its two closely adhering membranes, the white or albumen, consisting of four layers, and the yolk. These three main sections may be readily separated and their respective proportions of the whole determined. The four layers of white, namely the chalaziferous layer including the two chalazae, the inner thin white inclosed within the envelope of thick white, the thick or firm white, and the outer thin white are very closely associated and therefore, complete separation is difficult. Since it is practically impossible to separate the thick white and the chalaziferous layer they are combined in this study and considered as one character, the thick white.A number of investigators have determined the percentages of the three main divisions of the egg, the shell, white and yolk. Simon (1901) in a detailed .

Genetic studies in poultry

The blue egg character, common among fowls in parts of Chile, behaves as a simple dominant to non-blue. Combined with the various shades of brown it gives a series of greens and olives. Polychromatism in fowls and pheasants’ eggs follows apparently similar lines.

Physical Characters of Eggs in Relation to Hatchability.

The opinion that physical characters of eggs, such as size, shape, shell texture, etc., bear a significant relation to hatchability is wide-spread. For commercial hatching purposes eggs are regularly selected upon size, shape and general shell characters. Small, long, round, or uneven shelled eggs are discarded as of doubtful value for incubation purposes. Experimental evidence fails to substantiate the belief that physical characters of eggs are definitely associated with hatchability.Pearl and Surface (1914) found that the relative variability in egg shape is an individual characteristic, some birds laying eggs that are extremely variable in shape and others producing very uniform eggs.Benjamin (1920) states that size, shape or color of eggs have no effect on their incubation record; that there is no consistent difference in the shape of pullets’ and hen’s eggs. He did discover a positive correlation between size of egg incubated and size of chick hatched. This .

The Variation of Eggs in the Rate at Which They Lose Weight

PART IIn the course of a search for the possible causes of death of chick-embryos within the shell various characteristics of eggs have been studied, with the purpose of ascertaining whether variations in these egg characters were causing or were in any way related to variations in hatching quality. As a part of this search we have had occasion to determine the variability of individual eggs in the rate at which they lose weight, both at room temperature and under incubation conditions; and to determine also the amount of variation between individual fowls in respect to the rate at which their eggs lose weight. The importance of this for the general problem of embryonic mortality or hatchability can easily be seen, when we remember that the percentage of embryos that hatch or die under normal conditions is probably determined chiefly by the inherited constitution of the hens that lay .

THE INFLUENCE OF INBREEDING ON VIGOR IN HYDATINA SENTA

Next article FreeJournal ArticlesTHE INFLUENCE OF INBREEDING ON VIGOR IN HYDATINA SENTAA. FRANKLIN SHULLA. FRANKLIN SHULLDEPARTMENT OF ZOÖLOGY, UNIVERSITY OF MICHIGAN Search for more articles by this author DEPARTMENT OF ZOÖLOGY, UNIVERSITY OF MICHIGANPDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The Biological Bulletin Volume 24, Number 1December 1912 Published in association with the Marine Biological Laboratory Article DOIhttps://doi.org/10.2307/1536110 Views: 191Total views on this site Citations: 1Citations are reported from Crossref © 1912 Marine Biological LaboratoryPDF download Crossref reports the following articles citing this article:RUTH STOCKING LYNCH and HELEN BERENICE SMITH A STUDY OF THE EFFECTS OF MODIFICATIONS OF THE CULTURE MEDIUM UPON LENGTH OF LIFE AND FECUNDITY IN A ROTIFER, PROALES SORDIDA, WITH SPECIAL RELATION TO THEIR HERITABILITY, The Biological Bulletin 60, no.11 (Sep 2016): 30–59.https://doi.org/10.2307/1536787