畜牧兽医学报

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应用15N和嘌呤估测肉羊微生物N产量的研究

马涛1,刁其玉1*,邓凯东2,姜成钢1,屠焰1,张乃锋1,王永超1,刘洁1,赵一广1   

  1. (1. 中国农业科学院饲料研究所 农业部饲料生物技术重点实验室,北京 100081;2. 金陵科技学院动物科学与技术学院,南京 210038)
  • 收稿日期:2012-02-05 出版日期:2012-12-26 发布日期:2012-12-26
  • 通讯作者: 刁其玉,教授,博导,E-mail:diaoqiyu@mail.caas.net.cn
  • 作者简介:马涛(1987-),男,山东青岛人,博士生,主要从事动物营养与饲料方面研究,E-mail:nemesisematao@yahoo.com.cn
  • 基金资助:

    国家现代农业肉羊产业技术体系专项资金(CARS-39);公益性行业科研专项“饲料营养价值与畜牧饲养标准研究与应用”(200903006-03)

Study on Microbial N Yield Measured with 15N and Purine Bases in Mutton Sheep

MA Tao1, DIAO Qi-yu1*, DENG Kai-dong2, JIANG Cheng-gang1, TU Yan1, ZHANG Nai-feng1, WANG Yong-chao1, LIU Jie1, ZHAO Yi-guang1   

  1. (1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2. College of Animal Science and Technology, Jinling Institute of Technology, Nanjing 210038, China)
  • Received:2012-02-05 Online:2012-12-26 Published:2012-12-26

摘要:

本试验通过比较2种微生物标记物15N和嘌呤(Purine bases, PB)估测肉羊瘤胃微生物N产量的效果,旨在建立不同方法之间的内在联系,为准确地估测肉羊微生物N提供依据。试验选用12只平均体质量为(41.3±2.8) kg的杜寒杂交(杜泊羊×小尾寒羊杂交)绵羊公羔,随机均分为3组,按照自由采食、自由采食量的70%和40%3个干物质采食水平饲喂,试验共持续25 d,其中预试期10 d,正试期15 d,最后5 d采集瘤胃食糜和十二指肠食糜并测定15N和PB。结果表明,瘤胃细菌成分(氮含量、嘌呤含量和嘌呤/氮)不受日粮处理的影响 (P>0.05);十二指肠干物质、有机物、非氨氮和嘌呤流量均随日粮饲喂水平的降低显著下降(P<0.05);应用15N和PB计算得到的微生物N产量均随日粮饲喂水平的降低而显著降低(P<0.05),计算得出的微生物合成效率则均不受日粮处理的显著影响(P>0.05)。15N测定的微生物N在各处理内的变异性要小于PB测定得到的微生物N,因此应用15N来测定微生物N能够得到更为准确可靠的结果。

Abstract:

Two different microbial markers, 15N and purine bases(PB), were used in this experiment with the purpose to establish the relationship between the two methods and provide a precise way for measuring microbial N yield in mutton sheep. Twelve Dorper ( Small-tailed Han crossbreds, noncastrated male lambs ((41.3±2.8) kg BW) were randomly assigned to three levels of dry matter intake: ad libitum intake, 70% or 40% of the ad libitum intake, with four lambs at each level. The experiment lasted for 25 d (10 d for adaptation and 15 d for trial period). The ruminal bacterial components (N, purine bases and purine bases/N) were not affected by dietary treatment (P>0.05). Duodenal flows of dry matter, organic matter, non-ammonia nitrogen and PB decreased significantly with decrease of feed intake (P<0.05). Microbial N yield measured with either 15N or PB decreased significantly with decrease of feed intake (P<0.05) whereas the efficiency of microbial synthesis was not affected by dietary treatment for both markers (P>0.05). The result indicate that microbial N measured with 15N showed a smaller within-treatment variation than that measured with PB, and thus 15N can be a reliable marker for accurately quantifying microbial N.

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