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In the United States alone, more than 8 billion chickens are slaughtered each year for meat, [78] and more than 300 million chickens are reared for egg production. [79] The vast majority of poultry is raised in factory farms. According to the Worldwatch Institute, 74% of the world's poultry meat and 68% of eggs are produced this way. [80]
Voting period is over. Please don't add any new votes. Voting period ends on 10 Jun 2017 at 01:47:55 (UTC). Original – Diagram of a chicken egg in its ninth day of incubation showing all four extraembryonic membranes along with the embryo, the air pocket, and the shell
Diagram of stages of embryo development to a larval and adult stage. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1]
Egg incubation is the process by which an egg, of oviparous (egg-laying) animals, develops an embryo within the egg, after the egg's formation and ovipositional release. Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg.
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Battery cages are a housing system used by factory farms for various animal production methods, but primarily for egg-laying hens. The name arises from the arrangement of rows and columns of identical cages connected, in a unit, as in an artillery battery. Although the term is usually applied to poultry farming, similar cage systems are used ...
However, these eukaryotes probably are not primitively asexual, but have lost their sexual reproduction, or it just was not observed yet. [27] [28] Many eukaryotes (including animals and plants) exhibit asexual reproduction, which may be facultative or obligate in the life cycle, with sexual reproduction occurring more or less frequently. [29]