利用正构烷烃法估算内蒙古正蓝旗放牧绵羊的牧草采食量和消化率
Estimation of herbage intake and digestibility of grazing sheep in Zhenglan Banner of Inner Mongolia by using n-alkanes.
作者信息
Li Changqing, Xue Shuyuan, Tajima Atsushi, Ishikawa Naoto
机构信息
Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8577, Japan.
Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China.
出版信息
Anim Nutr. 2015 Dec;1(4):324-328. doi: 10.1016/j.aninu.2015.11.004. Epub 2015 Dec 12.
To reveal the seasonal dynamics of herbage intake, diet composition and digestibility and clarify the relationship of those with herbage nutrient and botanical composition of grazing sheep in Zhenglan Banner of Inner Mongolia, the n-alkane technique was used to test in sheep grazed during June, August and December. The results showed that the sheep mainly ate , and in proportions of 33.5, 17.9 and 21.2%, respectively, in spring. In summer, the sheep consumed cleistogenes, , , etc; the intake of , and declined. In winter, accounted for 50.1% of herbage intake, and the intakes of and increased to 15.3 and 18.4%, respectively. Herbage intake by the sheep in spring was 1.8 kg DM/d, and digestibility was 71.4%. Herbage intake and digestibility decreased slightly to 1.7 kg DM/d and 68.4% during the summer, respectively and decreased significantly to 1.2 kg DM/d and 36.4% in winter. There were significant correlations between diet composition and CP content in winter, diet composition and botanical composition in summer. A highly positive correlation between herbage intake and digestibility was observed in grazing sheep.
为揭示内蒙古正蓝旗放牧绵羊牧草采食量、日粮组成及消化率的季节动态，并阐明其与牧草营养成分和植物组成的关系，采用正构烷烃技术对6月、8月和12月放牧的绵羊进行了测定。结果表明，春季绵羊主要采食 、 和 ，比例分别为33.5%、17.9%和21.2%。夏季，绵羊采食隐子草、 、 等； 、 和 的采食量下降。冬季， 占牧草采食量的50.1%， 和 的采食量分别增至15.3%和18.4%。春季绵羊的牧草采食量为1.8 kg DM/d，消化率为71.4%。夏季牧草采食量和消化率分别略有下降至1.7 kg DM/d和68.4%，冬季则显著下降至1.2 kg DM/d和36.4%。冬季日粮组成与粗蛋白含量、夏季日粮组成与植物组成之间存在显著相关性。放牧绵羊的牧草采食量与消化率之间存在高度正相关。
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