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Alpaca

Domesticated species of South American camelid

  • 19 min read
  • 11 chapters
東山動植物園内の「こども動物園」で飼育されてるアルパカ。
KKPCW · CC BY-SA 4.0

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Through North America, Europe and Australia

There are two modern breeds of alpaca, separated based on their respective region of endemism and fiber (wool) type: the Suri alpaca and the Huacaya alpaca. Both breeds produce a highly valued fiber, with Suri alpaca's fiber growing in straight "locks," while Huacaya fiber has a "crimped," wavy texture and grows in bundles. These breeds' fibers are used for making knitted and woven items, similar to sheep's wool.

Alpacas are visually and genetically similar to, and often confused with a relative species, the llama; however, alpacas are visibly shorter and predominantly bred for their wool, while llamas have long been more highly prized as livestock guardians (in place of dogs), and as a pack animal (beast-of-burden), owing to their nimble mountain-climbing abilities. Both the alpaca and the llama are believed to have been domesticated and selectively bred from their wild counterparts — the smaller, fine-haired vicuña and the larger, stronger guanaco, respectively — at least 5,000 to 6,000 years ago. Nonetheless, all four South American camelids are closely related and can successfully crossbreed.

Alpacas communicate through body language, spitting to show dominance when distressed, fearful, or agitated. Male alpacas are more aggressive than females. In some cases, alpha males will immobilize the head and neck of a weaker or challenging male to show their strength and dominance.

In the textile industry, "alpaca" primarily refers to the hair of Peruvian alpacas. More broadly, it refers to a style of fabric originally made from alpaca hair, such as mohair, Icelandic sheep wool, or even high-quality wool from other breeds of sheep. In trade, distinctions are made between alpacas and the several styles of mohair and luster.

Background

The relationship between alpacas and vicuñas was disputed for many years. In the 18th and 19th centuries, the four South American lamoid species were assigned scientific names. At that time, the alpaca was assumed to be descended from the llama, ignoring similarities in size, fleece, and dentition between the alpaca and the vicuña. Classification was complicated by the fact that all four species of South American camelid can interbreed and produce fertile offspring. The advent of DNA technology made a more accurate classification possible.

In 2001, the alpaca genus classification changed from Lama pacos to Vicugna pacos, following the presentation of a paper on work by Miranda Kadwell et al. on alpaca DNA to the Royal Society showing the alpaca is descended from the vicuña, not the guanaco.

An adult alpaca generally is between 81 and 99 centimetres (32 and 39 inches) in height at the shoulders (withers). They usually weigh between 48 and 90 kilograms (106 and 198 pounds). Raised in the same conditions, the difference in weight can be small with males weighing around 22.3 kilograms (49 lb 3 oz) and females 21.3 kilograms (46 lb 15 oz).

Origin and domestication

Alpacas were domesticated thousands of years ago. The Moche people of Northern Peru often used alpaca images in their art. Traditionally, alpaca were bred and raised in herds, grazing on the level meadows and escarpments of the Andes, from Ecuador and Peru to Western Bolivia and Northern Chile, typically at an altitude of 3,500 to 5,000 metres (11,000 to 16,000 feet) above sea level. There are no known wild alpacas, and its closest living relative, the vicuña (also native to South America), is the wild ancestor of the alpaca.

The family Camelidae first appeared in the Americas 40–45 million years ago, during the Eocene period, from the common ancestor, Protylopus. The descendants divided into Camelini and Lamini tribes, taking different migratory patterns to Asia and South America, respectively. Although the camelids became extinct in North America around 3 million years ago, they flourished in the South. It was not until 2–5 million years ago, during the Pliocene, that the genus Hemiauchenia of the tribe Lamini split into Palaeolama and Lama; the latter would then split again into Lama and Vicugna upon migrating down to South America.

Remains of vicuña and guanaco dating around 12,000 years have been found throughout Peru. Their domesticated counterparts, the llama and alpaca, have been found mummified in the Moquegua valley, in the South of Peru, dating back 900 to 1000 years. Mummies found in this region show two breeds of alpacas. More precise analysis of bone and teeth of these mummies has demonstrated that alpacas were domesticated from the Vicugna vicugna. Other research, considering the behavioral and morphological characteristics of alpacas and their wild counterparts, seems to indicate that alpacas could find their origins in Lama guanicoe as well as Vicugna vicugna, or even a hybrid of both.

Genetic analysis shows a different picture of the origins of the alpaca. Analysis of mitochondrial DNA shows that most alpacas have guanaco mtDNA, and many also have vicuña mtDNA. But microsatellite data shows that alpaca DNA is much more similar to vicuña DNA than to guanaco DNA. This suggests that alpacas are descendants of the Vicugna vicugna, not of the Lama guanicoe. The discrepancy with mtDNA seems to be because mtDNA is only transmitted by the mother, and recent husbandry practices have caused hybridization between llamas (which primarily carry guanaco DNA) and alpacas. To the extent that many domestic alpacas are the result of male alpacas bred to female llamas, this would explain the mtDNA consistent with guanacos. This situation has led to attempts to reclassify the alpaca as Vicugna pacos.

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