Pabedaan antaro revisi dari "Yak (taranak)"

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Tag: Suntiangan sumber 2017
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== Taksonomi ==
Yak tamasuak dalam ''[[Bos]]'', aratinyo spesies nan bakarabaik jo [[jawi]] (''Bos primigenius''). Analisis [[DNA mitokondria]] taradok sijarah evolusi yak alun mandapek asia nan mayakinan.
 
Muyang Yak mungkin bapisah dari jawi di suatu maso antaro satu inggo limo juta taun nan lalu, dan ado nan mandugo baso yak labiah dakek ubuangannyo jo [[bison]] daripado anggota lainnyo dari kalompok genus tu.<ref name=Guo2006>{{cite journal | author = Guo, S.| year = 2006 | title = Taxonomic placement and origin of yaks: implications from analyses of mtDNA D-loop fragment sequences |url=http://www.mammal.cn/EN/abstract/abstract2079.shtml| journal = Acta Theriologica Sinica | volume = 26 | issue = 4 | pages = 325–330|display-authors=etal}}</ref> Fosil-fosil ewan nan jaleh barakabik jo yak, misanyo ''Bos baikalensis'', alah ditamuan di Rusia, inggo muncua pakiroaan jalua nan diambiak dek ewan muyang dari [[bison Amerika]] moderen, nan bantuaknyo sarupo jo yak kutiko masuak ka banua Amerika.<ref name=Leslie2009/>
 
== Ciri-ciri fisik ==
[[Berkas:Bos grunniens at Yundrok Yumtso Lake.jpg|leftkiri|thumbjmpl|Saikua yak jinak di [[Danau Yamdrok]].]]
Yak adolah ewan nan batubuah gadang jo kuaik, bakaki kokoh, bakuku bulek, jo babulu nan sangaik labak jo panjang nan manggantuang labiah randah dari paruiknyo. Bulu yak lia umumnyo bawarna itam kalam atau coklak kaitam-itaman, sadang yak jinak bamacam warnanyo, acok juo ado bercak-bercak coklat atau krem kacoklatan. Talingonyo ketek jo dahinyo leba, sarato tanduaknyo aluih jo umumnyo bawarna kalam. Yak jantan tanduaknyo kalua dari sisi-sisi kapalonyo, kudian malangkuang ka muko. Umumnyo panjangnyo mancapai {{convert|48|to|99|cm|abbr=on}}. Tanduak yak batino labiah ketek, anyo sapanjang {{convert|27|to|64|cm|abbr=on}}, jo bantuaknyo labiah tagak. Baiak yak jantan atau batino punyo lihia nan pendek sarato punuak nan jaleh di baunyo, walaupun punuak nan jantan labiah gadang jo talihek jaleh.<ref name=Leslie2009>{{cite journal | author1 = Leslie, D.M. | author2 = Schaller, G.B. | year = 2009 | title = ''Bos grunniens'' and ''Bos mutus'' (Artiodactyla: Bovidae) | journal = Mammalian Species | volume = 836 | pages = 1–17 | doi = 10.1644/836.1 }}</ref> Barek nan jantan mancapai {{Convert|350|to|580|kg|lb|abbr=on}}, barek nan batino mancapai {{Convert|225|to|255|kg|lb|abbr=on}}. Yak lia dapek jauah labiah barek, nan jantan dapek mancapai barek {{convert|1000|kg|lb}}.<ref>Buchholtz, C. (1990). True Cattle (Genus ''Bos''). pp. 386–397 in S. Parker, ed. ''Grzimek's Encyclopedia of Mammals, Volume 5''. New York: McGraw-Hill Publishing Company. (quoted in [http://animaldiversity.ummz.umich.edu/site/accounts/information/Bos_grunniens.html Oliphant, M. (2003). ''Bos grunniens'' (On-line), Animal Diversity Web. Accessed 4 April 2009])</ref> <!--Depending on the breed, domestic yak males are {{convert|111|-|138|cm|in}} high at the withers, while females are {{convert|105|-|117|cm|in}} high at the withers.<ref>{{Cite web|url=http://www.fao.org/docrep/006/AD347E/ad347e06.htm|title=The Yak. Chapter 2: Yak breeds|website=FAO|access-date=2017-08-31}}</ref>-->
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Both sexes have long shaggy hair with a dense woolly undercoat over the chest, flanks, and thighs to insulate them from the cold. Especially in bulls, this may form a long "skirt" that can reach the ground. The tail is long and horselike rather than tufted like the tails of cattle or bison. Domesticated yaks have a wide range of coat colours, with some individuals being white, grey, brown, roan or [[piebald]]. The [[udder]] in females and the [[scrotum]] in males are small and hairy, as protection against the cold. Females have four [[teat]]s.<ref name=Leslie2009/>
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