AnAge entry for Bos grunniens

Classification (HAGRID: 02254)
Taxonomy	Kingdom: Animalia Phylum: Chordata Class: Mammalia (Taxon entry) Order: Artiodactyla Family: Bovidae Genus: Bos
Species	Bos grunniens
Common name	Yak
Lifespan, ageing, and relevant traits
Maximum longevity	26.3 years (captivity)
Source	ref. 671
Sample size	large
Data quality	high
Observations	The yak reaches full size in 6-8 years. In the wild, these animals have been estimated to live up to 25 years [0434]. One captive specimen was still living after 26.3 years [0671].
Life history traits (averages)
Female sexual maturity	738 days
Male sexual maturity	738 days
Gestation	274 days
Weaning	228 days
Litter size	1 (viviparous)
Litters per year	0.8
Inter-litter interval
Weight at birth	18,000 g
Weight at weaning
Adult weight	667,000 g
Postnatal growth rate
Maximum longevity residual	69 %
Metabolism
No information on metabolism available.
References
[0671] Richard Weigl (2005), Longevity of Mammals in Captivity; from the Living Collections of the World [0610] Ernest (2003), Life history characteristics of placental non-volant mammals [0434] Ronald Nowak (1999), Walker's Mammals of the World [0107] Tonami and Takahashi (1997), Effects of aging on tensile fatigue strength of bovine dentin, PubMed [0455] Virginia Hayssen et al. (1993), Asdell's Patterns of Mammalian Reproduction: A Compendium of Species-Specific Data [0106] Gaczynska et al. (1986), Proteolytic susceptibility of membrane proteins during erythrocyte aging, PubMed [0541] Tibetan Yaks
External resources
Integrated Taxonomic Information System	ITIS 183840
Animal Diversity Web	ADW account
Encyclopedia of Life	Search EOL
Genome Project	Search NCBI
Entrez	Search all databases Entrez Taxonomy search
Ageing literature	Search Google Scholar Search PubMed Search Scirus
Images	Google Image search
Internet	Search Google

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