Some eggs are laid by female animals of the many different species, including birds, reptiles, amphibians, mammals, and fish, and are eaten by humans for thousands of years.[1] Bird and reptile eggs contains a protective eggshell, albumen (egg white), and vitellus (egg yolk), contained within various thin membranes. The most commonly consumed eggs are chicken eggs. Other poultry eggs including those of duck and quail are also eaten. Fish eggs are called roe and caviar.
Egg yolks and whole eggs store significant amounts of protein and choline,[2][3] and are widely utilized in cookery. Due to their protein content, the us Department of Agriculture formerly categorized eggs as Meats within the Food Guide Pyramid (now MyPlate).[2] Despite the nutritional value of eggs, there are some potential health issues arising from cholesterol content, salmonella contamination, and allergy to egg proteins.
Chickens and other egg-laying creatures are kept widely throughout the planet and production of chicken eggs may be a global industry. In 2009, an estimated 62.1 million metric plenty of eggs were produced worldwide from a complete laying flock of roughly 6.4 billion hens.[4] There are problems with regional variation in demand and expectation, also as current debates concerning methods of production . In 2012, the ecu Union banned battery husbandry of chickens.
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