摘要
在家庭牧场尺度上,研究了划区轮牧与连续放牧2种不同放牧制度对绵羊摄食和体重的影响,目的是比较不同放牧制度对绵羊体重的影响,为草地合理放牧利用提供理论依据。研究结果表明,暖季连续放牧的条件下,绵羊采食的植物种类多,摄食营养高,体增重快。但就整个放牧季节而言,连续放牧制度不利于牧草的均匀利用,使草群营养与绵羊体重表现出较大的波动,而划区轮牧能够保持绵羊体重的稳定增长与较高的家畜生产。试验中比较了模拟采食法、活动围笼法与经验公式法3种不同的采食量测定方法,根据观察与试验结果,笔者认为在大群家畜放牧条件下用模拟采食法测定绵羊采食量要偏低于其正常采食量,活动围笼法在用于连续放牧条件下的采食量测定时,需要增加测定重复次数以提高其测定的准确性,在大群家畜放牧条件下运用经验公式法来估算家畜采食量是可取的。
A comparative study of rotational grazing system (RG) and continuous grazing system (CG) was conductedin the warm season on the scale of a family ranch in Stipa breviflora desert steppe in order to measure the live weight changein different grazing systems and to provide basic data for rational grazing management. A second objective was to comparethe three different methods of measuring forage intake by sheep including the grazing simulation method, moving cagemethod and empirical formula method. The nutrition of sheep diets was better and live weight gain per day was greater in CGthan in RG. However, on CG pasture, the utilization of forage was less uniform, nutrient contents and sheep live weight weremore variable, and live weight gain and pasture production were less than in the RG. The empirical formula method isrecommended for estimating forage intake by sheep on a family ranch scale. The moving cage method could providereasonable estimates of forage intake by sheep under continuous grazing and sufficient replicates should be taken.
出处
《中国农业科学》
CAS
CSCD
北大核心
2004年第5期744-750,共7页
Scientia Agricultura Sinica
基金
国家自然科学基金资助项目(30060056
30360022)
教育部青年教师教学科研奖励计划
内蒙古教育厅重点领域资助项目(ZL98005)
