Structure and composition of the eggs from several avian species

Roca, Pilar; Sainz, Florencia; González, Mauricio; Alemany, M.

doi:10.1016/0300-9629(84)90065-3

Cited by 17 publications

(1 citation statement)

References 19 publications

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“…;Roca et al, 1984;Keener et al, 2000;Brun et al, 2013, Lobzov et al, 1987 Monte Carlo modeling of electron and secondary photon transport was performed with MCNP4C2. The spectra of90 Sr and 90 Y were taken from Java-based Nuclear Data Information System -"Janis 4.1"(Soppera et al, 2014).…”

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confidence: 99%

Radiation internal dose to the herring gull embryo due to 90 Sr in the egg

Shishkina,

Khramova,

Mogilnikova

et al. 2024

Preprint

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Birds are bioindicators of anthropogenic environmental stress, including the changes caused by radioactive contamination of the ecosystems. The early stage of development is the most radiosensitive period. Therefore, it is necessary to assess embryo's exposure dose when interpreting observed radiobiological effects in birds. This is especially true for areas contaminated with Ca-like 90Sr. The levels of radionuclide accumulation in the eggshell can be extremely high, which leads to chronic embryo exposure. The objective of the study is to develop a method to calculate the dose to a herring gull embryo exposed to 90Sr distributed in egg compartments (shell, embryo body, white and yolk). To achieve the set objective, the time-dependent Sr distribution in the egg compartments was described. Alongside with that, dosimetric modeling was carried out to obtain dose factors that convert the radionuclide activity in different compartments of an egg to the embryo doses at various stages of embryogenesis. It has been shown that the accumulated dose to the herring gull embryo can be calculated based on the data on 90Sr total activity in the egg using the dose conversion factor equal to 0.44 µGy Bq− 1. Since the eggshell contains more than 90% of total 90Sr activity, the conversion from eggshell activity to the dose to the embryo would be practically the same as that from the total egg activity – 0.46 µGy Bq− 1. The main dose fraction (~ 99%) accumulates at the last stage of embryogenesis (from 13 to 26 days).

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confidence: 99%

Radiation internal dose to the herring gull embryo due to 90 Sr in the egg

Shishkina,

Khramova,

Mogilnikova

et al. 2024

Preprint

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Importance of prenatal nutrition to the development of a precocial chick

Hill

1993

Developmental Psychobiology

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The developmental maturity of hatchling birds varies greatly across the altricial-precocial continuum and these differences are related to the relative proportions of yolk and albumen in a species' egg. In general, the more precocial the chick the greater the proportion of yolk in its egg. Egg composition can also vary within species with unknown consequences for the developing embryo. The present research sought to determine the importance of egg composition to avian development by experimentally removing 1, 2, 4, 8, 12, or 16% of the albumen from eggs of domestic fowl (Gallus gallus). Experimental chicks were paired to control chicks whose eggs were matched on the basis of original mass and laid by the same female but no albumen was removed from their eggs prior to incubation. Decreased levels of albumen significantly decreased chick size at hatch. Experimental subjects, however, had similar growth to controls after 20 days of ad-lib access to food, although sex differences between pairs indicated that the growth of females may be affected differentially by albumen removal. Righting responses were retarded in experimental subjects for the 2 and 4% albumen-removal groups. Egg composition can have important consequences for chick survival simply by influencing body size at hatch and it is suggested that the practice of using overall egg size as a measure of egg "quality" needs to be broadened by considering what is inside the egg as well. In addition, the unique opportunity presented by using an avian model to assess directly the specific influences of protein (albumen) and of fat (yolk) on growth and behavioral development is explored.

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Reproduction in the Female

Johnson¹

1986

Avian Physiology

141

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Structure and composition of the eggs from several avian species

Cited by 17 publications

References 19 publications

Radiation internal dose to the herring gull embryo due to 90 Sr in the egg

Radiation internal dose to the herring gull embryo due to 90 Sr in the egg

Importance of prenatal nutrition to the development of a precocial chick

Reproduction in the Female

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