Egg physical characteristics and hatchability

The physical characteristics of the egg play an important role in the processes of embryo development and successful hatching. The most influential egg parameters are: weight, shell thickness and porosity, shape index, described as maximum breadth to length ratio, and the consistency of the contents. The average values of the physical characteristics mostly meet the requirements for the embryo's development. For those eggs, whose parameters do not fall in to the average range, the incubation process is more successful if the shell is thicker than average, the eggs are more pointed rather than round, and the contents firm. The results reported for investigations into incubating eggs, whose weights are not within the average values, are contradictory. Both thick shells and firm interiors, which are accepted as being higher than average, lead to an increase in egg weight, which probably results in the more successful hatching of embryos from heavier eggs.

[1]  R. E. Phillips,et al.  Relationship of specific gravity and shell appearance to the hatchability of fertile turkey eggs. , 1944 .

[2]  D. Deeming.  Factors affecting hatchability during commercial incubation of ostrich (Struthio camelus) eggs. , 1995, British poultry science.

[3]  K Kuchida,et al.  Nondestructive prediction method for yolk:albumen ratio in chicken eggs by computer image analysis. , 1999, Poultry science.

[4]  E. Moran,et al.  Broiler Yields Using Chicks from Extremes in Breeder Age and Dietary Propionate , 1998 .

[5]  G. Visser,et al.  Artificial incubation of Muscovy duck eggs: why some eggs hatch and others do not. , 2001, Poultry science.

[6]  Alexis L. Romanoff,et al.  The avian egg , 1949 .

[7]  D. Hessels,et al.  The relationship between hatching egg weight and subsequent performance of broiler chickens , 1968 .

[8]  D. G. Satterlee,et al.  Factors affecting ostrich egg hatchability. , 1999, Poultry science.

[9]  W. D. Weaver,et al.  Influence of Egg Size, Eggshell Quality, and Posthatch Holding Time on Broiler Performance , 1985 .

[10]  D. Deeming,et al.  The relationship between eggshell porosity and oxygen consumption of the embryo in the domestic fowl. , 1982, Comparative biochemistry and physiology. A, Comparative physiology.

[11]  A. Nordskog,et al.  Direct and maternal effects of egg-size genes on hatchability. , 1971, Genetics.

[12]  J. Brake,et al.  Factors Affecting Broiler Breeder Performance: 4. The Interrelationship of Some Reproductive Traits , 1981 .

[13]  J. Brake,et al.  Relationship of Eggshell Porosity to Stage of Embryonic Development in Broiler Breeders , 1985 .

[14]  W. H. Wiley.  The Influence of Egg Weight on the Pre-Hatching and Post-Hatching Growth Rate in the Fowl III. Shank Length-Body Weight Ratios , 1950 .

[15]  L. Andrews.  Phenotypic Correlations of Certain Turkey Egg Parameters , 1972 .

[16]  E. Moran,et al.  Broiler Yields Using Chicks from Egg Weight Extremes and Diverse Strains , 1998 .

[17]  F. Hays,et al.  Physical Characters of Eggs in Relation to Hatchability. , 1927 .

[18]  S. Tullett,et al.  The effects of egg weight and shell porosity on the growth and water balance of the chicken embryo , 1985 .

[19]  H. R. Wilson.  Interrelationships of egg size, chick size, posthatching growth and hatchability , 1991 .

[20]  M. Greenberg.  The measurement of quality. , 1990, Medical group management journal.

[21]  M. C. Soares,et al.  Effects of eggshell quality and broiler breeder age on hatchability. , 1994, Poultry science.

[22]  P. Sharma,et al.  Relationship between egg weight, shape index and fertility and hatchability of Japanese quail (Coturnix coturnix japonica) eggs. , 1980 .

[23]  J. Rendel.  VARIATIONS IN THE WEIGHTS OF HATCHED AND UNHATCHED DUCKS' EGGS , 1943 .

[24]  F. N. Reece,et al.  Effect of Age of Parents and Hatching Egg Weight on Broiler Chick Mortality , 1978 .

[25]  F. Proudfoot,et al.  The Influence of Hatching Egg Size on the Subsequent Performance of Broiler Chickens , 1981 .

[26]  C. Brunson,et al.  The Relationship of Egg Shape, Egg Weight, Specific Gravity and 21-Day Incubation Weight-Loss to Hatchability of Broad-Breasted Bronze Turkey Eggs , 1953 .

[27]  M. A. Coleman,et al.  The effect of light and specific gravity on embryo weight and embryonic mortality. , 1975, Poultry science.

[28]  V. Narushin,et al.  The Avian Egg: Geometrical Description and Calculation of Parameters , 1997 .

[29]  J. Brake,et al.  Eggshell Quality and Hatchability in Broiler Breeder Eggs , 1987 .

[30]  V. Narushin,et al.  Non-destructive measurements of egg parameters and quality characteristics , 1997 .

[31]  W. H. Wiley.  The Influence of Egg Weight on the Pre-Hatching and Post-Hatching Growth Rate in the Fowl II. Egg Weight-Chick Weight Ratios , 1950 .

[32]  S. Tullett,et al.  A comparison of the effects of eggshell porosity on the respiration and growth of domestic fowl, duck and turkey embryos , 1983 .

[33]  H. Marks,et al.  Effects of selection for growth and selection diet on eggshell quality and embryonic development in Japanese quail. , 1991, Poultry science.

[34]  J De Baerdemaeker,et al.  Measuring the mechanical stiffness of an eggshell using resonant frequency analysis. , 1999, British poultry science.

[35]  S. Tullett,et al.  Factors affecting the weight and water status of the chick at hatch , 1982 .