畜牧兽医学报 ›› 2025, Vol. 56 ›› Issue (7): 3252-3264.doi: 10.11843/j.issn.0366-6964.2025.07.019

• 生物技术与繁殖 • 上一篇    下一篇

基于代谢组学技术筛选人工授精后未妊娠奶牛血浆潜在生物标志物的研究

郑浩1(), 罗芳1,2, 宋承磊1, 陶金忠1,*()   

  1. 1. 宁夏大学动物科技学院,银川 750021
    2. 兰州大学草地农业科技学院,兰州 730000
  • 收稿日期:2024-12-02 出版日期:2025-07-23 发布日期:2025-07-25
  • 通讯作者: 陶金忠 E-mail:1571893591@qq.com;tao_jz@nxu.edu.cn
  • 作者简介:郑浩(2001-),男,河南济源人,硕士,主要从事动物遗传育种与繁殖研究,E-mail:1571893591@qq.com
  • 基金资助:
    宁夏回族自治区重点研发项目(2022BBF03022)

Screening Potential Plasma Biomarkers of Non-pregnant Dairy Cows after Artificial Insemination Based on Metabolomics Technology

ZHENG Hao1(), LUO Fang1,2, SONG Chenglei1, TAO Jinzhong1,*()   

  1. 1. College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
    2. College of Grassland Agriculture and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2024-12-02 Online:2025-07-23 Published:2025-07-25
  • Contact: TAO Jinzhong E-mail:1571893591@qq.com;tao_jz@nxu.edu.cn

摘要:

旨在揭示未妊娠荷斯坦奶牛在人工授精当天到第28天的血浆代谢变化规律,并筛选指示奶牛未妊娠结局的生物标志物,为减少奶牛空怀时间、缩短产犊间隔及早期妊娠诊断提供新思路。本研究以宁夏某奶牛场健康荷斯坦奶牛(体重550±50 kg、3~4岁、2~3胎次)为试验对象。经同期发情处理后人工授精(AI)。分别于AI后第0天(A组)、第5天(B组)、第17天(C组)和第28天(D组)采集尾静脉血(晨饲前),分离血浆并冻存于-80℃。在第32天经B超筛选出未妊娠且未返情的12头奶牛,对其4个时期(n=12)血浆样品进行单样本超高效液相色谱串联四级杆飞行时间质谱(UHPLC-QTOF-MS)非靶向代谢组学技术检测与分析。结果显示:1)人工授精后不同时期,未妊娠奶牛血浆代谢特征存在差异;2)在筛选出的32种差异代谢物中,8种差异代谢物具备较高灵敏度(AUC>0.7),相比于人工授精当天,DL-香草扁桃酸和光黄素在授精第5天高表达,色氨酸-谷氨酸、异亮氨酸-精氨酸、甘氨脱氧胆酸和2-乙氧基乙醇在授精第17天高表达,而精氨酸-酪氨酸和硬脂酸在授精第28天高表达,且授精后第0天和第17天之间未妊娠奶牛血浆差异代谢物主要富集在精氨酸生物合成通路上。结果表明,精氨酸生物合成提示为影响奶牛妊娠发生的关键通路,DL-香草扁桃酸、光黄素等AUC值较高的8种关键代谢物提示为人工授精后早期指示奶牛未妊娠的生物标志物,结果可为提高奶牛繁殖效率提供新的思路。

关键词: 荷斯坦奶牛, 人工授精, 未妊娠, 代谢组学, 生物标志物

Abstract:

This study aimed to reveal the changes in plasma metabolism of non-pregnant Holstein dairy cows from the day of artificial insemination to day 28 and to screen biomarkers indicating non-pregnant dairy cows, to provide new ideas for reducing the idle time of dairy cows, shortening the calving interval and early pregnancy diagnosis. This study was conducted using healthy Holstein dairy cows (body weight: 550±50 kg, age: 3-4 years, parity: 2-3) from a dairy farm in Ningxia. Following estrus synchronization, artificial insemination (AI) was performed (designated as Day 0). Blood samples were collected from the tail vein (before morning feeding) at 4 time points: Day 0 (Group A), Day 5 (Group B), Day 17 (Group C), and Day 28 (Group D). Plasma was separated and stored at -80℃. On Day 32 post-AI, ultrasound examination confirmed 12 non-pregnant cows without return to estrus. Plasma samples from these cows (n=12) were analyzed using ultra performance liquid chromatography quadrupole time of flight mass spectrometry (UHPLC-QTOF-MS)-based untargeted metabolomics. The results showed as follows: 1) The plasma metabolism characteristics of non-pregnant cows were different at different periods after artificial insemination; 2) Among the 32 differential metabolites screened, 8 had higher sensitivity (AUC> 0.7). Compared with the day of artificial insemination, DL-vanillyl mandelic acid and lumichrome were highly expressed on the 5th day of insemination, and Trp-Glu, Ile-Arg, glycodeoxycholic acid, and 2-ethoxyethanol were highly expressed on the 17th day of insemination. However, Arg-Tyr and pristanic acid were highly expressed on the 28th day of insemination, and the plasma differential metabolites between d 0 and d 17 after insemination were mainly concentrated in the arginine biosynthesis pathway. The results indicate that arginine biosynthesis may be a key pathway affecting the occurrence of pregnancy in dairy cows. The 8 key metabolites with high AUC values such as DL-vanillyl mandelic acid and lumichrome may be biomarkers indicating that dairy cows are not pregnant early after artificial insemination. The results can provide new ideas for improving the reproductive efficiency of dairy cows.

Key words: Holstein dairy cows, artificial insemination, non-pregnant, metabolomics, biomarkers

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