欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2020, Vol. 29 ›› Issue (5): 43-49.DOI: 10.11686/cyxb2019354

• 研究论文 • 上一篇    下一篇

甜高粱的饲用价值及其绵羊体外瘤胃发酵产气性能研究

周恩光1, 王虎成1,*, 尚占环2   

  1. 1.兰州大学草地农业生态系统国家重点实验室,兰州大学农业农村部草牧业创新重点实验室,兰州大学草地农业教育部工程研究中心,兰州大学草地农业科技学院,甘肃 兰州 730020;
    2.兰州大学生命科学学院,甘肃 兰州 730000
  • 收稿日期:2019-08-14 出版日期:2020-05-20 发布日期:2020-05-20
  • 通讯作者: * E-mail: wanghuch@lzu.edu.cn
  • 作者简介:周恩光(1992-),男,河南商丘人,在读硕士。E-mail: zhoueg17@lzu.edu.cn
  • 基金资助:
    定西市安定区草地农业试验示范区建设项目(GCLM2017)和甘肃省重大科技专项计划项目“饲用甜高粱种质创新及栽培饲用技术研究与示范(1502NKDA005-3)”资助

Nutritional value of forage sweet sorghum and its gas production performance evaluated using incubation with sheep rumen fluid in vitro

ZHOU En-guang1, WANG Hu-cheng1,*, SHANG Zhan-huan2   

  1. 1.State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Engineering Research Center of Grassland Industry, Ministry of Education, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
    2.College of Life Science, Lanzhou University, Lanzhou 730000, China
  • Received:2019-08-14 Online:2020-05-20 Published:2020-05-20
  • Contact: * E-mail: wanghuch@lzu.edu.cn

摘要: 本试验旨在研究不同收割时期饲用甜高粱的饲用价值及其绵羊体外瘤胃发酵产气性能,分别对8-11月收割的甜高粱(大奖3180,标记为S1、S2、S3与S4)的养分含量及相对饲喂价值(RFV)、总可消化养分(TDN)、干物质采食量(DMI)、可消化干物质(DDM)和牧草相对饲用品质(RFQ)进行评价。利用体外模拟发酵产气技术评定不同收割时期的甜高粱在3、6、9、12、24、36和48 h体外产气规律,估算降解率。结果表明,1)不同收割时期的甜高粱的干物质(DM)、粗蛋白(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、粗脂肪(EE)和粗灰分(Ash)含量差异均显著(P<0.05)。2)不同收割时期的甜高粱的RFV、DMI、RFQ呈现出S1>S4>S3>S2,差异极显著(P<0.001)。S1和S4的TDN和DDM含量差异不显著(P>0.05),但极显著高于S2和S3(P<0.001)。3)在培养12 h之前,不同收割时期的甜高粱产气量(GP)差异极显著(P<0.001),且S3的GP最高;24 h后,S4的GP显著高于S2(P<0.05);培养36 h后不同收割时期的甜高粱GP差异不显著(P>0.05)。4)不同时期收割的甜高粱在发酵12、24、48 h的干物质消失率(DMD)均无显著差异(P>0.05)。综上结果,8月对黄土高原丘陵沟壑区甜高粱进行收割时饲用价值最好。

关键词: 甜高粱, 收割时期, 营养价值, 体外发酵性能

Abstract: This experiment studied the nutritional value and gas production performance, when incubated with sheep rumen fluid, of sweet sorghum forage harvested at different crop growth stages. The forage sweet sorghum cultivar Dajiang 3180 was harvested in August (S1), September (S2), October (S3) and November (S4), the herbage nutritive value analyzed. And the relative feeding value (RFV), total digestible nutrient (TDN), dry matter intake (DMI), digestible dry matter (DDM) and relative forage quality (RFQ) were evaluated. Herbage digestibility and the gas production at 3, 6, 9, 12, 24, 36 and 48 h were evaluated by in vitro simulated fermentation. It was found that: 1) There were significant differences in dry matter, crude protein, neutral detergent fiber, acid detergent fiber, ethanol extract and crude ash levels at the different harvest dates (P<0.05). 2) There were significant differences across the four harvest periods in RFV, DMI and RFQ (S1>S4>S3>S2) (P<0.001). The TDN and DDM of S1 and S4 were higher than the S2 and S3 harvests (P<0.001). 3) For the first 12 h of fermentation, there were gas production (GP) differences between the four harvest periods (P<0.001), with the GP of S3 being the highest. After 24 h, the GP of S4 was higher than S2 (P<0.05); There were no significant differences in GP between the four harvest periods after 36 h incubation (P>0.05). 4) There were no significant difference in DMD between the four harvest periods at 12, 24 and 48 h of incubation (P>0.05). In summary, the feeding value of sweet sorghum in the ‘hill and gully’ region of the Loess Plateau, China, is highest in August.

Key words: sweet sorghum, harvest period, nutritional value, in vitro fermentation characteristics