摘要
试验旨在研究不同饲养水平下,妊娠后期牦牛对主要营养物质的消化代谢和气体代谢规律,补充完善牦牛饲养标准基础参数。利用随机分组设计将15只体重相近、经同期发情处理并本交配种的妊娠期牦牛分为3组,即自由采食、80%采食组(IR80)和60%采食组(IR60),每组5头牛。分别在妊娠180 d和210 d进行消化代谢试验和气体代谢试验,测定主要营养物质的代谢规律参数。结果表明:①饲喂水平对妊娠后期牦牛干物质(DM)、有机物(OM)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的表观消化率影响差异不显著;②妊娠后期牦牛对氮的需要量增加明显,较低的饲喂水平将严重影响牦牛对饲料中氮的利用效率;③妊娠后期牦牛总能消化率、总能代谢率、消化能代谢率变化范围分别在54.93%~60.14%、44.76%~54.09%和81.49%~91.69%之间,呼吸熵在0.69~0.73之间,且随饲养水平增大而增大。
This experiment was conducted to investigate the regularity of digestion and metabolism of main nutrients and gas metabolism in yak during late pregnancy under different feeding levels. The results were provided to supplement and perfect basic parameters for yak feeding standard. Fifteen healthy yaks treated for estrus synchronization and natural service, and then randomly divided into three feeding levels groups(ad libitum group, 80% the ad libitum intake group and 60% the ad libitum intake group).Digestion and metabolism tests and gas metabolism were sdudied in the periods of the 180th and 210th days of pregnancy. The results showed that: ① The apparent digestibility of DM, OM, NDF and ADF in yak did not change with the feeding levels during late pregnancy;② During late pregnancy, the increase of nitrogen requirement in yak was obvious, and the lower feeding level would seriously affect yak’s absorption and utilization of nitrogen in feed;③ The total digestibility, total energy metabolism rate and the metabolic rate of digestive energy in the later period of pregnancy were 54.93% to 60.14%, 44.76% to 54.09%, 81.49% to 91.69%, respectively. The respiratory quotients de-creased with the decreasing levels, ranging from 0.69 to 0.73.
作者
潘浩
聂召龙
王通
刘书杰
孙璐
杨其恩
冯宇哲
崔占鸿
Pan Hao;Nie Zhaolong;Wang Tong;Liu Shujie;Sun Lu;Yang Qien;Feng Yuzhe;Cui Zhanhong
出处
《饲料工业》
北大核心
2020年第7期8-13,共6页
Feed Industry
基金
放牧牦牛冷季营养平衡调控技术研究[2018YFD0502403]
牦牛和藏绵羊母畜能量与蛋白质营养需要量的研究[2016YFC0501805]
中国科学院“西部之光”项目[3-4]。
关键词
牦牛
妊娠后期
消化代谢
氮代谢
能量代谢
气体代谢
yak
late pregnancy
digestion and metabolism
nitrogen metabolism
energy metabolism
gas metabolism
