Male-mediated introgression of Bos indicus genes into Argentine and Bolivian Creole cattle breeds
✍ Scribed by G Giovambattista; M V Ripoli; J C De Luca; P M Mirol; J P Lirón; F N Dulout
- Book ID
- 104457348
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 154 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0268-9146
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✦ Synopsis
The geographic distribution and frequency of Bos taurus and Bos indicus Y chromosome haplotypes amongst Argentine and Bolivian Creole cattle breeds were studied, using cytogenetic and molecular genetic techniques. A complete correspondence between Y chromosome morphology and the haplotype of the Y‐linked microsatellite marker INRA 124 was found in all males examined. The taurine and indicine haplotypes were detected in 85·7 and 14·3% of the males studied, respectively, although these frequencies varied amongst the different breeds examined. The geographic distribution of this polymorphism suggests a pattern of zebu introgression in South America. The highest frequencies of the Zebu Y‐chromosome are found in Brazilian populations (43–90%), in the eastern part of the continent, while it is absent in the southermost breeds from Uruguay and Argentina. Bolivan breeds, at the centre of the continent, exhibit intermediate values (17–41%). This east/west and north/south gradient of male Zebu introgression could be explained by historical events and environmental factors.