The phrase "domestication about" is not grammatically correct and is not commonly used in written English.
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Our data further suggest that a large sample of wild horse diversity was incorporated into the domestic population; specifically, at least 46 of the mtDNA lineages observed in domestic horses (73%) already existed before the beginning of domestication about 5,000 years ago.
Another particularly acquisitive period in human evolution was probably livestock domestication about 10,000 years ago.
If correct, that interpretation puts cat domestication about 3000 years after dogs became man's best friend and very close to the time that wheat and sheep were domesticated.
Silkworms have a relatively short history of domestication, (about 5000 year) but show dramatic phenotypic changes.
Divergence between parviglumis and maize is very recent, dating to domestication about 9,000 BP (Matsuoka et al. 2002).
Archaeological remains indicate early goat domestication (about 10 000 years ago) in the Iranian Zagros Mountains as well as in the high Euphrates valley and southeastern Anatolia.
If one uses a relatively recent estimate for horse domestication of about 5,000 years ago [ 32], our data suggest that at least 46 mtDNA lineages and therefore at least as many wild mares, contributed to the domestic gene pool.
Now, studies of ancient DNA by two independent research groups show what was happening to the plant's genes mid-domestication, about 5000 years ago.
Archaeological evidence indicates that domestication happened about 6,000 years ago, but just how it happened is something of an open question.
Furthermore, by calculating the genetic distance between modern maize and Balsas teosinte, they estimated that domestication occurred about 9,000 years ago.
Our results support the notion that domestication brings about relaxation of selection and accumulation of deleterious mutations.
