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dwarfing : ウィキペディア英語版
dwarfing

Dwarfing is a process in which a breed or cultivar of plants and animals is changed to become significantly smaller than standard members of their species. The effect can be induced through human intervention or non-human processes, and can include genetic, nutritional or hormonal means. Used most specifically, dwarfing includes pathogenic changes in the structure of an organism (for example, the bulldog, a genetically achondroplastic dog breed), in contrast to non-pathogenic proportional reduction in stature (such as the whippet, a small greyhound dog breed).〔Johnson, K.A. and Watson, A. D. J. "Skeletal Disorders" Textbook of Veterinary Internal Medicine, 5th Ed. Saunders(2000) Philedephia Vol 2 pg 1898〕
==Animals==
In animals, including humans, dwarfism has been described in several ways. Shortened stature can result from growth hormone deficiency, starvation, portal systemic shunts, renal disease, hypothyroidism diabetes mellitus and other conditions. Any of these conditions can be established in a population through genetic engineering, selective breeding, or insular dwarfism, or some combination of the above.
Dwarfing can produce more practical breeds that can fit in small accommodations, or may appeal aesthetically, as well as other associated side effects. Smaller stature may be a deliberate goal of breeding programs, or it may be a side effect of other breeding goals.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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