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polymorphism is associated with milk production traits in Chinese cattle.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "polymorphism is associated with milk production traits in Chinese cattle."

The production traits of cattle, especially milk trait, are of great significance to human life. A quantitative trait loci (QTL) associated with milk fat content was detected in the centromeric region of cattle chromosome 14. This QTL harbors a strong candidate gene called responsible for the milk quality. A non-conservative substitution of lysine by alanine () was found in gene producing a strong effect on milk composition and yield. The lysine (K allele) is associated with increased milk fat content, while the decreased milk fat content is linked to the alanine (A allele) amino acid. To estimate the frequencies of the polymorphism in Chinese cattle breeds, PCR and DNA sequencing methods were used to investigate the polymorphism of in a total of 682 individuals, including 655 Chinese cattle and 27 Holstein cattle. The results demonstrated that the frequency of K allele gradually elevated from the northern group to the southern group of native Chinese cattle, whereas the frequency of A allele showed a contrary pattern, displaying a significant geographical difference across native Chinese cattle breeds. Our results confirm that the southern cattle group has higher milk fat content than that of the northern group.

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This article was published in the following journal.

Name: Animal biotechnology
ISSN: 1532-2378
Pages: 1-5

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