Nutria fur is a type of fur obtained from the nutria, which is also known as the coypu, beaver rat or swamp beaver. The native habitat of the nutria is South America, but the animal was released into the wild for fur production in the first half of the 20th century and is now also found in Germany and large parts of Europe, Asia and North America. As a rule, nutria furs are plucked and/or sheared (without the bristly guard hair).
Fur The fur length is about 43 to 63 cm (17 to 25 in), the barely hairy tail is 30 to 45 cm long (12 to 18 in). The hair color of the wild nutria is dark brown, occasionally grayish or reddish brown; the long, coarse tips of the guard hairs are often yellowish. The undercoat is dark gray-brown to black-brown, bluish-black. In contrast to almost all other fur animals, the quality of the nutria fur is better on the belly part than on the back, and the mammary glands are also located on the sides of the back, again in contrast to other fur animals. The middle of the fur is only slightly darker than the sides compared to other fur types. In some parts of the dewlap and belly area, an ombré-like brightening is noticeable, which can go as far as light gray-whitish between the ears, for example. In order to better showcase the fuller belly area after processing, the round-skinned pelt was usually cut open along the back.
Pelt structure A distinction is made between 3 types of guard hairs; for every 10 mm² there is 1 leading hair (larger one), 3 guard hairs that gradually taper into their shaft, and 19 guard hairs with sharply defined tips. The guard hair is 1.5 to 3.3 cm long on the back (according to Franke/Kroll up to 8 cm!) and 2.5 to 3.3 cm long on the belly. The undercoat is particularly dense on the sides of the pelt and is 12 to 15 mm long. The 15 to 18 mm long wool hairs on the back only reach a density of 40% of the belly side. On average, there are 150 hairs per cm². Similar to the beaver, the guard hairs on the back of the nutria fur are not regularly distributed, but are usually grouped together in tufts or clusters.
Hair structure The lowest part of the hair base is light-colored, almost white. Then a silver-colored part appears, which shades into medium to dark grey and finally brown-grey within a few millimeters. The ends of the wool are medium to dark brown-grey and give the hair base its color. The guard hairs show an increasing degree of cornification from the base to the tip. The guard cross-section is bean-shaped to oval; the wool hair cross-section is round to almost round. The particularly fine wool hairs are slightly curled. The proportion of guard hair in the pelt is varies greatly: there are soft, highly elastic types as well as longer, glassy, miscolored varieties. The guard hairs, which are particularly well developed in nutria, are yellowish, but the majority are yellow to orange in color and show the ring-shaped agouti contrast at the end of the hair.
Hide structure The nutria fur has a distinctly porous structure. The long guard hairs run deep in the hide and often extend into the subcutaneous connective tissue, especially in the back. In the back tissue, the hide is several millimetres thick, in the belly part it is much thinner and more spongy. Based on general experience, the durability coefficient for both plucked and unchanged nutria furs was given as 40 to 50%. Another, unspecified list sets the durability at 35.5% and ranks it 25th on an incomplete durability scale, which traditionally begins with the fur of the sea otter, which is assumed to be the most durable, and ends here with the hare fur in 41st position. An American study ranked nutria fur at only 25% based on hair tests, contrary to practical experience. When fur animals are divided into the fineness categories, among which are silky, fine, medium-fine, coarser and hard, the nutria hair is not included, with the indication that the upper hair is on the harder side, but the undercoat has an exceptionally soft texture.
Wild nutria vs. farmed nutria
Wild nutrias As a result of excessive hunting, nutria populations in their South American homeland, from the equator to Patagonia, were severely depleted. While around 10 million pelts were still coming onto the world market from there in 1910, by 1930 there were only around 200.000. Conservation and protection laws in individual countries meant that significant exports from South America are once again coming onto the market. Argentinian nutria were released in the Soviet Union in 1929/1930. In 1987, 36.000 nutria pelts from Mongolia were offered at Russian auctions, 3500 more than in the previous year. In the 1930s, nutria farming for fur production began in the USA. When it became clear that nutria farming was not profitable, the animals were released. By 1988, 41 U.S. states and three Canadian provinces already had significant populations of nutria. In 1988, according to Kroll/Franke “the number of fur-bearing animals in the United States is 1.2 million (mainly from Louisiana) and rising”.
South America
Argentina Province of Buenos Aires: silky; gray undercoat with reddish-brown tips. Hair length on the back 17 to 19 milimiters (0.7 to 0.75 inches), on the belly 10 to 13 milimiters (0.4 to 0.5 inches). About 40% of Argentina's production comes from here, with the ones from Madariaga having the best quality. Isla (confluence of the Paraná-Uruguay and La Plata rivers): silkier undercoat than from Buenos Aires, slightly smaller pelts. Hair on the shaft is gray, tips are brown-gray; better than the provincial product. Hair length more even, less than 20 mm (0.8 inches). Rivers (from the provinces of Entre Ríos, Corrientes, parts of Santa Fe, Formosa, and Misiones): silky like the pelts from Islas, same size as those from the province of Buenos Aires. Grayest Argentine quality, gray hair ends, gray and gray-brown tips. Worse quality, but very dense and, compared to the back and belly, very evenly long hair. Southern ones (from the southern provinces of Rio Negro, Neuquen, Mendoza, Chubut, Santa Cruz): this is where the largest nutria pelts come from; they are about the same size as farmed pelts. The belly is pearl gray, the back is gray, and the tips are gray-brown. The length of the back hair is 22 to 26 mm, that of the belly hair 18 to 20 mm; the hair is very sparse.
Uruguay Montevideo: worse quality coat, beautiful coloration.
Paraguay Gran Chaco: less dense undercoat; slightly discolored; thin and less sturdy hide.
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