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- W4362705019 abstract "Abstract Background High-grain (HG) diets affect lipid metabolism in the liver and mammary tissue of dairy cows, but its effects on muscle and adipose tissue have not been wide evaluated. Thus, the aim of this study is to clarify this issue. Methods Twelve Holstein cows were randomly divided into two groups: conventional diet group (CON, n = 6) and the HG diet group ( n = 6). On day 7 of week 4, rumen fluid was sampled to measure pH, milk was sampled to measure components, and blood was sampled to measure biochemical parameters and fatty acid composition. After the experiment, cows were slaughtered to collect muscle and adipose tissue for fatty acid composition and transcriptome analysis. Results HG feeding decreased the ruminal pH, milk’s fat content and long-chain fatty acid proportion ( P < 0.05) and increased the proportion of short- and medium-chain fatty acids in the milk ( P < 0.05) as compared with CON diets. The concentrations of blood cholesterol, low-density lipoprotein, and polyunsaturated fatty acids in the HG cows were lower than those in CON cows ( P < 0.05). In muscle tissue, HG feeding tended to increase the triacylglycerol (TG) concentration ( P < 0.10). Transcriptome analysis revealed changes in the biosynthesis of the unsaturated fatty acids pathway, the regulation of lipolysis in the adipocytes pathway, and the PPAR signalling pathway. In adipose tissue, HG feeding increased the concentration of TG and decreased the concentration of C18:1 cis 9 ( P < 0.05). At the transcriptome level, the fatty acid biosynthesis pathway, linoleic acid metabolism pathway, and PPAR signalling pathway were activated. Conclusion HG feeding leads to subacute rumen acidosis and a decreased milk fat content. The fatty acid profiles in the milk and plasma of dairy cows were changed by HG feeding. In muscle and adipose tissue, HG feeding increased TG concentration and up-regulated the expression of genes related to adipogenesis, while down-regulated the expression of genes related to lipid transport. These results complement our knowledge of the fatty acid composition of muscle and adipose tissue in dairy cows and expand our understanding of the mechanisms by which HG diets affect lipid metabolism in muscle and adipose tissue." @default.
- W4362705019 created "2023-04-09" @default.
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- W4362705019 date "2023-04-08" @default.
- W4362705019 modified "2023-10-09" @default.
- W4362705019 title "Effects of high-grain diet feeding on fatty acid profiles in milk, blood, muscle, and adipose tissue, and transcriptional expression of lipid-related genes in muscle and adipose tissue of dairy cows" @default.
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- W4362705019 doi "https://doi.org/10.1186/s40104-023-00847-y" @default.
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