1. It is important to quantify eggshell microstructure because it may influence eggshell mechanical properties and could be of importance for eggshell quality assessment. It also provides information about changes in eggshell associated with different hen physiological conditions. 2. This paper describes an alternative methodology which, based on 2D X-ray diffraction, allows eggshell microstruc...

The efficiency of chicken eggshell membranes combined with a minimally invasive small osteotomy procedure of the ulna to accomplish an efficient release of the radius so that it can continue to grow in an unstressed manner was tested in rabbits. Eggshell membranes were extracted from chicken eggs, rinsed, dried and sterilized with ethylene oxide for 24 h. For reactivity testing, four separate s...

Birds have been used as bioindicators of pollution, such as toxic metals. Levels of pollutants in eggs are especially interesting, as developing birds are more sensitive to detrimental effects of pollutants than adults. Only very few studies have monitored intraspecific, large-scale variation in metal pollution across a species' breeding range. We studied large-scale geographic variation in met...

Eggshell membrane (ESM) is a unique biomaterial, which is generally considered waste. However, it has extraordinary properties which can be utilized in various fields and therefore it is being widely studied these days. Within this paper, the examples of multidisciplinary applications of the ESM are given. The author has published a review paper on this topic recently (Baláž, 2014a). Particular...

Reproduction is a critical period for birds as they have to cope with many stressful events. One consequence of an acute exposure to stress is the release of corticosterone, the avian stress hormone. Prolonged stress can have negative impacts on the immune system, resulting in, for example, increased oxidative stress. Through maternal effects, females are known to modulate their investment in e...

objective(s):  the aim of this study was to evaluate the final outcome of nerve regeneration across the eggsell membrane (esm) tube conduit in comparison with autograft. materials and methods: thirty adult male rats (250-300 g) were randomized into (1) esm conduit, (2) autograft, and (3) sham surgery groups. the eggs submerged in 5% acetic acid. the decalcifying membranes were cut into four pie...

The aim of this study was to investigate the genetic and phenotypic correlations of egg quality traits in Khazak chicken. Albumen height (AH), albumen weight (AW), eggshell color (ESC), yolk color (YC), eggshell index, long length of egg (ELL), short length of egg (ESL), eggshell weight (ESW), egg weight (EW), Haugh units, and yolk weight (YW) were measured in 201 eggs collected 6 d sequentiall...

Blue-green and brown-spotted eggshells in birds have been proposed as sexual signals of female physiological condition and egg quality, reflecting maternal investment in the egg. Testing this hypothesis requires linking eggshell coloration to egg content, which is lacking for brown protoporphyrin-based pigmentation. As protoporphyrins can induce oxidative stress, and a large amount in eggshells...

Deformation behavior of the composite “eggshell–polymer plomb” was examined under bending. Hen eggs were taken as a biological material for experiments. It shown that viscoelastic polymer coating does not change type deformation composite, given eggshell continued to be brittle despite its mechanical characteristics varying widely solid. Joint “polymer plomb–eggshell” never cracked bending and ...

Based on the knowledge of the heme bio-synthetic and metabolic pathway and the structures of biliverdin and protoporphyrin, experiments were carried out to compare the difference between the total quality of eggshell pigments in blue-shelled eggs and brown-shelled eggs from the same population (Dongxiang, China) and to analyze the correlation between the quantity of protoporphyrin and biliverdi...