State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China.
State Key Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China.
Animal. 2023 Feb;17(2):100705. doi: 10.1016/j.animal.2023.100705. Epub 2023 Jan 5.
Livestock grazing plays a significant role in maintaining grasslands and promoting animal production globally. To understand the livestock performance in sown pasture (SP) vs native pasture (NP) is important to ensure more effective grassland-livestock interactions with minimal environmental impact. A 2 (treatment) * 2 (period) Latin Square design experiment was conducted with 10 growing Hu sheep ♂ × thin-tailed Han sheep ♀ rams grazed perennially SP vs NP in an inland arid region of China. The objectives were to evaluate the effects of grazing management on nutrient digestibility, nitrogen (N) and energy utilisation and methane (CH) emission. The N intake, N retained and energy intake (gross energy (GE), and digestible and metabolisable energy) of sheep grazing in SP were significantly increased compared with those grazing in NP. There were significant linear relationships between DM intake (DMI) (g/kg BW or g/kg BW) or CH (g/kg BW or g/kg BW) emissions and forage nutrient and GE concentrations within each grassland type. The linear regression analysis indicated that forage CP or ether extract concentration was a good predictor for DMI (g/kg BW or g/kg BW) (R = 0.756 or 0.752), and CH emission could be predicted using forage nutrient and GE concentrations (R = 0.381-0.503). These results suggest that DMI and CH emissions per unit metabolic BW were accurately predicted by multiple-factor combinations of forage nutrients, including ether extract and CP paired with GE. The present output could provide useful information for the development of sustainable sheep grazing systems in the inland arid regions of the world.
放牧在维护全球草原和促进动物生产方面发挥着重要作用。了解播种草地（SP）和天然草地（NP）中牲畜的性能对于确保更有效地进行草地-牲畜相互作用并将环境影响降至最低非常重要。本研究采用 2（处理）×2（时期）拉丁方设计试验，在中国内陆干旱地区，每平方公尺放牧 10 只生长胡羊♂×细毛羊♀杂交公羊，永久性放牧 SP 或 NP。目的是评估放牧管理对养分消化率、氮（N）和能量利用以及甲烷（CH）排放的影响。与放牧 NP 的绵羊相比，放牧 SP 的绵羊的 N 摄入量、N 保留量和能量摄入量（总能（GE）以及可消化和可代谢能）显著增加。在每种草地类型内，DM 摄入量（DMI）（g/kgBW 或 g/kgBW）或 CH 排放量（g/kgBW 或 g/kgBW）与饲草养分和 GE 浓度之间存在显著的线性关系。线性回归分析表明，饲草 CP 或乙醚提取物浓度是 DMI（g/kgBW 或 g/kgBW）（R=0.756 或 0.752）的良好预测因子，而 CH 排放可以通过饲草养分和 GE 浓度来预测（R=0.381-0.503）。这些结果表明，通过包括乙醚提取物和 CP 在内的多种饲草营养物质与 GE 的组合，可以准确预测单位代谢 BW 的 DMI 和 CH 排放量。本研究结果可为世界内陆干旱地区可持续绵羊放牧系统的发展提供有用信息。
