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草业学报 ›› 2021, Vol. 30 ›› Issue (6): 170-179.DOI: 10.11686/cyxb2020107

• 研究论文 • 上一篇    下一篇

妊娠早期饲粮中添加N-氨甲酰谷氨酸对母羊早期胚胎存活及相关血液指标的影响

蔡元1(), 罗玉柱2(), 臧荣鑫1, 李春阳1, 扎西英派1   

  1. 1.西北民族大学生命科学与工程学院,甘肃 兰州 730030
    2.甘肃农业大学动物科学技术学院,甘肃 兰州 730070
  • 收稿日期:2020-03-12 修回日期:2020-06-29 出版日期:2021-05-21 发布日期:2021-05-21
  • 通讯作者: 罗玉柱
  • 作者简介:Corresponding author. E-mail: luoyz@gsau.edu.cn
    蔡元(1976-),男,甘肃武威人,副教授,硕士。E-mail: 413432905@qq.com
  • 基金资助:
    “十三五”国家重点研发计划课题(2017YFD0501904);中央高校基本科研业务费专项资金项目(31920190043);中央高校基本科研业务费专项资金项目(31920190208-02);甘肃农业大学课题(GSAU-ZL-2015-031);兰州市科技计划项目(2016-3-91)

Effect of N-carbamylglutamate supplementation during early pregnancy on early embryonic survival and blood indexes in ewes

Yuan CAI1(), Yu-zhu LUO2(), Rong-xin ZANG1, Chun-yang LI1, Ying-pai ZHAXI1   

  1. 1.Life Science and Engineering College of Northwest Minzu University,Lanzhou 730030,China
    2.College of Animal Science and Technology,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2020-03-12 Revised:2020-06-29 Online:2021-05-21 Published:2021-05-21
  • Contact: Yu-zhu LUO

摘要:

本试验旨在研究妊娠早期饲粮中添加N-氨甲酰谷氨酸(NCG)对母羊胚胎存活及相关血液指标的影响,并对其作用机制进行初步探讨。选择发情正常、健康状况良好的湖羊50只,随机分为2组(对照组和NCG试验组),每组25只母羊,自配种当天开始给母羊分别饲喂基础饲粮(对照组)和基础饲粮+0.11%NCG(NCG组),饲喂期38 d。测定妊娠第19和38天母羊血浆游离氨基酸、总一氧化氮合酶(TNOS)、内皮型一氧化氮合酶(eNOS)、诱导型一氧化氮合酶(iNOS)、一氧化氮(NO)、雌二醇、孕酮的浓度;38 d时每组各屠宰7只妊娠母羊,测定妊娠母羊的黄体数和活胎儿数等指标。结果显示,与对照组相比,妊娠第38天时,NCG组每只母羊总胎儿数增加了79.72%(P<0.05),活胎儿数增加了79.72%(P<0.05),胎儿形成指数增加了0.26(P<0.05),胎水体积增加了72.89%(P<0.05),活胎儿总重提高了71.13% (P<0.05);NCG组妊娠第19天的甘氨酸、蛋氨酸、赖氨酸、精氨酸、NO、iNOS、eNOS和孕酮的浓度显著高于对照组(P<0.05),NCG组妊娠第19天的瓜氨酸和脯氨酸极显著高于对照组(P<0.01);NCG组妊娠第38天的精氨酸、脯氨酸和NO显著高于对照组(P<0.05),NCG组妊娠第38天的iNOS和eNOS的浓度极显著高于对照组(P<0.01)。由此,妊娠早期饲粮中添加NCG提高了胚胎和胎儿的存活,增加了妊娠母羊第38天的总胎儿数和活胎儿数,改善了母羊的繁殖性能,其作用机制可能是NCG促进了母羊内源性精氨酸的合成,提高了母羊血浆精氨酸、NO和孕酮含量,改善了子宫内环境和营养供给,使之有利于胚胎着床和妊娠维持。

关键词: N-氨甲酰谷氨酸, 母羊, 胚胎存活, 精氨酸, 一氧化氮

Abstract:

This study aimed to investigate the effect of N-carbamylglutamate (NCG) supplementation on early embryonic survival and blood indexes in ewes, and to explore its mechanism. Fifty ewes with normal estrus and good health were randomly divided into two groups (Control group and NCG group), with 25 ewes per group. From the day of mating, the ewes in the Control group were fed on a basic diet and those in the NCG group were fed on a diet containing 0.11% NCG for 38 days. The plasma amino acids, total nitric oxide synthase (TNOS), endothelial nitric oxide synthetase (eNOS), inducible nitric oxide synthase (iNOS), nitric oxide (NO), estradiol, and progesterone concentrations were measured on days 19 and 38 of gestation. Seven ewes in each group were killed on day 38 of gestation to obtain uterine samples, and the corpora lutea, total fetus, and other indexes were measured and recorded. On day 38 of gestation, compared with the Control group, the NCG group showed higher values for the total number of fetuses (79.72% increase; P<0.05) and live fetuses (79.72% increase; P<0.05), fetus formation index (0.26 increase; P<0.05), fetal water volume (72.89% increase; P<0.05), and total live fetal weight (71.13% increase; P<0.05). On day 19 of gestation, the concentrations of glycine, methionine, lysine, arginine, NO, iNOS, eNOS, and progesterone in plasma were significantly higher in the NCG group than in the Control group (P<0.05), and the contents of citrulline and proline in plasma were very significantly higher in the NCG group than in the Control group (P<0.01). On day 38 of gestation, the concentrations of arginine, proline, and NO in plasma were significantly higher in the NCG group than in the Control group (P<0.05), and the concentrations of iNOS and eNOS in plasma were very significantly higher in the NCG group than in the Control group (P<0.01). The results show that NCG supplementation in the early stage of pregnancy can enhance embryonic and fetal survival, increase the number of total and live fetuses on day 38 of gestation, and improve the reproductive performance of ewes. The potential mechanism is that supplemented NCG promotes endogenous arginine synthesis in ewes and increases the plasma concentrations of arginine, NO, and progesterone. This improves the intrauterine environment and nutrient supply, which are beneficial for embryo implantation and the maintenance of pregnancy in ewes.

Key words: N-carbamylglutamate, ewes, embryonic survival, arginine, NO