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The dun gene is a dilution gene that affects both red and black pigments in the coat color of a horse. The dun gene lightens most of the body while leaving the mane, tail, legs, and primitive markings the shade of the undiluted base coat color. A dun horse always has a dark dorsal stripe down the middle of its back, usually has a darker face ...
Most wild equids are dun, as were many horses and asses before domestication of the horse. Some were non-dun with primitive markings, and non-dun 1 is one of the oldest coat color mutations, and has been found in remains from 42,700 years ago, along with dun. Non-dun 2, the version of the dun gene that most domestic horses have, is thought to ...
Consort Dun (1746–1806), Chinese imperial consort; Dun Deal (born 1986), American record producer and rapper; Dun Mihaka; Dun Karm Psaila (1871–1961), Maltese writer and poet; Dun Mikiel Xerri (1737–1799), Maltese patriot; Mao Dun (1896-1981), Chinese writer; Xiahou Dun (d. 220), Chinese general and politician
For humans, the efficiency of conversion is estimated as requiring 60 mg of tryptophan to make 1 mg of niacin. Riboflavin , vitamin B 6 and iron are required for the process. [ 20 ] Pellagra is a consequence of a corn-dominant diet because the niacin in corn is poorly bioavailable and corn proteins are low in tryptophan compared to wheat and ...
The cream gene is responsible for a number of horse coat colors. Horses that have the cream gene in addition to a base coat color that is chestnut will become palomino if they are heterozygous, having one copy of the cream gene, or cremello, if they are homozygous. Similarly, horses with a bay base coat and the cream gene will be buckskin or ...
The dun gene and cream gene are present in the genetic material, but not white nor any variations of pinto. The Coldblood Trotter has a relatively small and square head with large nostrils. It is well suited for the cold conditions in Scandanivia, and it can develop large amounts of winter hair, having less need for blankets in winter.
Vitamin C can be synthesized by some species but not by others. Vitamin B 12 is the only vitamin or nutrient not available from plant sources. The Food Fortification Initiative lists countries which have mandatory fortification programs for vitamins folic acid, niacin, vitamin A and vitamins B 1, B 2 and B 12. [9]
Conrad Arnold Elvehjem (May 27, 1901 – July 27, 1962) was internationally known as an American biochemist in nutrition.In 1937 he identified two vitamins, nicotinic acid, also known as niacin, and nicotinamide, [1] which were deficient directly in human pellagra, once a major health problem in the United States. [2]