Admixture analysis of South Asian cattle

Area of Science:

• Population Genetics
• Animal Genomics
• Cattle Domestication

Background:

• South Asia is a key region for the origin and diversification of domestic cattle (Bos indicus).
• Understanding genetic diversity and ancestral origins is crucial for cattle conservation and breeding.
• Previous studies have not comprehensively analyzed microsatellite variation within South Asian cattle breeds.

Purpose of the Study:

• To conduct a population genetic analysis of microsatellite variation in seven Bos indicus cattle breeds.
• To estimate the extent and pattern of Bos taurus ancestry within these South Asian cattle populations.
• To investigate the historical genetic interactions between Bos indicus and Bos taurus.

Main Methods:

• Microsatellite variation analysis across seven Bos indicus breeds from South Asia.
• Systematic selection and frequency examination of Bos taurus-associated alleles.
• Analysis of genetic distances truncated from European populations.
• Model-based Bayesian admixture analysis to infer ancestry proportions.

Main Results:

• Evidence of Bos taurus genetic influence was detected in the Indian subcontinent.
• A genetic gradation was observed, extending from European populations through the Near East to India.
• The admixture patterns suggest an ancient origin for this intercontinental genetic exchange.

Conclusions:

• Bos indicus cattle in South Asia exhibit a detectable level of Bos taurus ancestry.
• The findings support a model of ancient, gradual genetic admixture across Eurasia.
• This research provides novel insights into the complex demographic history of domestic cattle.