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Hao, Z.Y.; Wang, J.Q.; Luo, Y.L.; Liu, X.; Li, S.B.; Zhao, M.L.; Jin, X.Y.; Shen, J.Y.; Ke, N.; Song, Y.Z.; Qiao, L.R.
Domestic animal endocrinology, January 2021, 2021-01-00, 20210101, Letnik: 74Journal Article
Micro ribonucleic acid (miRNA) is a type of noncoding RNA, and it has been revealed to play important roles in the activity of the mammary gland (MG) in some species. However, the function of miRNAs in MG of sheep is poorly understood. In the study, Gansu Alpine Merino (GAM; n = 9) and Small-tailed Han sheep (STH; n = 9) with different milk production traits were investigated. Microstructures and the expression profile of miRNAs of MG tissues at peak lactation were studied. Mature alveolar lumens of MG in appearance were larger in STH than GAM. The expression levels of CSN2 and the content of rough endoplasmic reticulum were also higher in STH ewes than GAM ewes. A total of 124 mature miRNAs were expressed, and 18 of these were differentially expressed between the 2 breeds. The KEGG analysis results showed that the targeted genes of differentially expressed miRNAs were mainly involved in some metabolic pathways and signaling pathways related to MG development, milk protein, and fat synthesis. The findings in the study can improve our understanding of the roles of miRNAs in the development and lactation of MG in sheep. •The number of mature alveolar determines the milk yield of ewes.•The miRNAs may cause the difference in milk traits between 2 breeds.•Targeted genes of miRNAs were involved in mammary gland development and lactation.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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