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Niacin mitigates rumen epithelial damage in vivo by inhibiting rumen epithelial cell apoptosis on a high concentrate diet

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Abstract

To investigate the effects of niacin on rumen fermentation, rumen epithelial antioxidant activity, and rumen epithelial cell apoptosis on high concentrate (HC) diets, nine male Hu sheep were randomly fed one of three diets: low concentrate diet (LC; concentrate: forage (C:F) = 20:80, high concentrate diet (HC; C:F = 80:20), and HCN diet (HC diet + niacin at 800 mg/kg diet air-dry matter). Compared with the LC group, the HC group had a lower rumen pH, higher volatile fatty acids and lactic acid in the rumen, reduced activity of antioxidant enzymes and total antioxidant capacity, and increased malondialdehyde content in the rumen epithelium (P < 0.05). Rumen epithelial papilla morphology was decreased, and apoptosis-related indicators and serum inflammatory cytokines were increased in the HC group over the LC group (P < 0.05). Compared with the HC diet, the HCN diet increased rumen pH, rumen epithelium antioxidant capacity, and rumen epithelial papilla morphology, decreased rumen lactate content, serum inflammatory cytokines, and apoptosis-related indicators (P < 0.05). Therefore, adding 800 mg/kg niacin helped protect against rumen epithelial damage by avoiding drastic changes in the rumen environment and improved rumen epithelial antioxidant capacity to inhibit rumen epithelial cell apoptosis in sheep on a HC diet.

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The datasets generated and analyzed during the current study are not publicly available due to all the results in the form of means and statistics are presented in this paper, but are available from the corresponding author on reasonable request.

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Funding

This work was funded by the National Natural Science Foundation of China (31560648), Jiangxi Provincial Cattle and Sheep Industry Technology & System (JXARS-13), China Agriculture Research System of MOF and MARA (CARS-37).

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Z.G., K.Ouyang. designed the overall study. Z.G., Y.L., C.X., D.L., Q.Q., K.P., X.X., M.Q. performed experiments. Z.G., Y.L. wrote the manuscript. All authors contributed to the article and approved the submitted version.

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Correspondence to Kehui Ouyang.

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This study was approved by the Animal Care and Use Committee of the College of Animal Science and Technology of Jiangxi Agricultural University (JXAULL-2020-27).

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The authors declare that they have no conflicts of interest.

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Gao, Z., Li, Y., Xu, C. et al. Niacin mitigates rumen epithelial damage in vivo by inhibiting rumen epithelial cell apoptosis on a high concentrate diet. Vet Res Commun 46, 699–709 (2022). https://doi.org/10.1007/s11259-022-09885-9

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  • DOI: https://doi.org/10.1007/s11259-022-09885-9

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