Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (11): 2731-2742.doi: 10.11843/j.issn.0366-6964.2020.11.012

• ANIMAL NUTRITION AND FEEDS • Previous Articles     Next Articles

The Effect of Folic Acid Supplementation on the Expression of Genes Related to Immunity and Milking Traits in Subclinical Mastitis Cows

LIU Xueqin, WANG Di, MI Siyuan, ZHANG Ruiqiang, SHI Liangyu, YU Ying*   

  1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Received:2020-05-28 Online:2020-11-25 Published:2020-11-20

Abstract: The study aimed to explore the effect and related molecular mechanisms of folic acid supplementation on the immunity and milking related traits of dairy cattle with subclinical mastitis, which would lay a foundation for folic acid supplementation of cows with subclinical mastitis. A total of 29 lactating cows were selected based on their parity, body weight and somatic cell count (SCC>500×103 cells·mL-1 for 2 consecutive months) from a Holstein cow population in a farm near Beijing, China. The 29 cows were randomly divided into feeding group (n=18) and control group (n=11). The 18 cattle in feeding group were fed with extra-coated folic acid (120 mg/500 kg per day) for two weeks, and no treatment in the control group. Then collected DHI data (including somatic cell count, daily milk yield, etc.) were analyzed. Subsequently, four individuals were randomly selected in each group to collect leukocytes, extract RNA and perform transcriptome sequencing. DESeq2 was used to perform differential expression gene analysis using RNA-Seq data. KOBAS3.0 pathway database was used for KEGG and GO functional analysis. Somatic cell counts (SCC) showed a significant decrease (P<0.05) after folic acid supplementation, however, no significant effect was observed on milking related traits. A total of 277 differentially expressed genes (P<0.05, log2|Fold Change|>1) were detected in the comparison between the two groups, including 105 up-regulated and 172 down-regulated genes. GO analysis showed that these genes were mainly enriched in the immune-related functions terms, including inflammation, immune response, regulation of cytokine production, cell differentiation, leukocyte chemotaxis and migration, and regulation of immune system processes. In addition, KEGG pathway analysis revealed that these DEGs were involved in innate immunity and cellular immune response pathways. In conclusion, folic acid supplementation has an important impact on immune-related traits and expression level of genes related to immune pathways. The current research provides a foundation for the promotion and application of folic acid supplementation.

Key words: Chinese Holstein cows, folic acid supplementation, subclinical mastitis, immune-related traits, milking traits

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