A 2026 study sequenced 30 feral Hong Kong cattle, finding genetic clues to their ancestry and possible adaptations

A genome study of 30 Hong Kong feral cattle found high genetic diversity alongside signs of inbreeding. Cattle once served as working animals for farmers in Hong Kong, but changing economic conditions eventually led to the decline of cattle farming. Then, in the 1970s, some cattle were abandoned and began roaming freely. Generations later, the animals have become a distinctive feral population, living with little of the human management that shaped domestic cattle.Feral Hong Kong cattle graze atop lush coastal hills at golden hour, blending science and nature. (AI-generated/ ChatGPT)Now, their DNA is offering clues to what happened after that change. A 2026 genome study sequenced 30 Hong Kong feral cattle and compared them with 116 cattle from four major populations. The results revealed a population that retained surprisingly high genetic diversity despite its small size, while also carrying genetic signatures linked to its long history of isolation, ancient wild-bovine ancestry and adaptation to the local environment.When cattle stopped living by human rulesThe Hong Kong cattle population is thought to number about 1,000 animals. Researchers collected samples mainly from Sai Kung, Lantau Island, and the eastern and northern New Territories. Unlike conventional livestock, these animals have faced environmental pressures without the same level of protection, controlled breeding, and veterinary care normally provided to farm cattle.Deep DiveThat makes the population unusually valuable for studying what happens when domesticated animals become feral. A 2020 study had already found that Hong Kong cattle were genetically distinctive and showed evidence of ancestry connected with wild bovines. That earlier work examined 21 Hong Kong cattle alongside 703 animals representing 36 cattle populations and wild species including gaur and banteng. In the new research, the analysis was more extensive because it examined each animal’s full genome rather than focusing mainly on selected genetic markers. The team sequenced the genomes of the 30 animals at 30x coverage depth.What does the cattle DNA reveal?Genome-wide analysis revealed that Hong Kong cattle were most closely related to East Asian indicine cattle, although the population has developed a genetic signature unique to itself. Scientists also found that the cattle's ancestors received some genetic input from banteng and gaur before diverging from other East Asian indicine cattle.Even more interesting is when this happened. It appears that the banteng introgression took place approximately 8,900 years ago, while gaur introgression occurred about 9,900 years ago. In other words, some of the genes in today’s feral cattle may have entered the lineage long before the animals became independent in Hong Kong.The cattle showed an unusual combination of high genetic diversity and inbreeding. Despite having decreased effective population size, the cattle still maintained high genomic variation. On top of that, these cattle displayed longer segments of the same DNA sequence than several other indicine populations.Feral cattle grazing in Hong Kong’s countryside, illustrating the free-ranging livestock population studied for its genetic history and adaptation. (Wikimedia Commons.)How did life in the wild shape them?The investigators then looked for evidence of natural selection by testing whether certain genome regions were favored during adaptation to the cattle’s environment. Some genomic regions showed associations with traits relevant to survival, such as heat resistance, bone density, and coat pigmentation. A specific genomic region for the ADRA1A gene showed an association with heat stress response. Other genomic regions showed associations with biological functions related to development, immunity, and metabolism.The cattle’s physical appearance is another clue. The feral cattle in Hong Kong come in displaying varied fur patterns, distinct horn shapes, asymmetrical humps, and irregular body profiles. The research team found copy-number variation in genes such as NINL, DEXI, and CIITA that may help explain differences in coat color. However, the results of the research do not mean that all genetic differences have been confirmed as adaptations. The researchers listed a few of these gene regions as candidates whose effects still need to be tested.In 2026, the DNA results tell a broader story about how generations of ancestry, isolation, and natural selection shaped the population. The herd offers a rare example of how domesticated animals evolve when human influence fades. For scientists, the herd is much more than an interesting subject of genetic research. The herd’s wild-bovine ancestry, high genetic diversity, and apparent adaptation could help scientists study how heat, disease, and other pressures shape cattle evolution. For Hong Kong, the wandering herd is a living reminder of the territory’s agricultural history.The Hindustan Times US Desk brings you the latest news and developments from across the United States. The team covers everything from breaking news and politics to sports, business, entertainment and stories that are trending across the country. Our coverage includes the White House, Congress, US elections, immigration and visa updates, H-1B, green cards, Social Security, education, jobs, layoffs, the economy, technology and major policy changes. We also closely follow stories that matter to Indian and South Asian communities in the US. The desk covers major US sports, including the NFL, NBA, MLB and NHL, along with player news, injuries, schedules, results and major events. Entertainment coverage includes Hollywood, celebrities, television, streaming, music and pop culture. We also report on breaking developments, major incidents, weather, public safety, court cases and other stories making headlines across the country. When a major policy or news development affects people's everyday lives, the team works to explain what happened, what it means and what readers need to know. Alongside breaking news, the US Desk produces explainers and practical stories on topics such as immigration, Social Security, taxes, education, employment and government programmes. The team also works on science, tech, business and AI stories analyzing the impact they may have on people. The team follows developments throughout the day, keeping an eye on official announcements, public records, reliable news sources and what people are talking about across the US.Read MoreUs Local NewsAnimalHong KongGet the latest World News, breaking headlines and global updates from the US, UK, Pakistan, Bangladesh, Russia and other countries. Follow major international events on Hindustan Times.