不同放牧率对混播草地牧草与羔羊生产的影响  

Effects of Different Stocking Rates on Herbage and Lamb Production in a Mixed Pasture System

作　　者：沈景林[1] 符义坤[1] 贾笃敬[1] 李光棣[1] 张景雨[1] 

机构地区：[1]甘肃农业大学

出　　处：《草业学报》1994年第1期25-32,共8页Acta Prataculturae Sinica

基　　金：国家自然科学基金

摘　　要：通过三种放牧率对混播草地牧草和羔羊生产的影响进行了研究。结果表明，随着放牧率的增加，牧草产量、叶面积指数明显下降（Ｐ＜０．０５）并使茎叶比显著减少（Ｐ＜０．０５）。放牧率的增大，羔羊个体生产速度显著降低（Ｐ＜０．０１），单位面积的畜产品产量依次为中组＞低组＞高组。并得出羔羊生长量与放牧强度及采食牧草干物质量存在密切关系，同时放牧率影响肉的品质，放牧率不同，草地系统生物学转化效率中组比低、高组高，且草地生产能力最大。由此得出，混播草地以中等放牧率为最佳。The effects of three stocking rates(SR,13 lamb/hm2 , 26 lamb/hm2 and 39 lamb/hm2) on herbage andlamb production in a mixed sown pasture system were studied in 1991.The results showed that herbageyield,LAI and leaf/stem ratio were decreased Significantly(P<0.05)by the increasing of SR. Insecondary production,lamb live-weight gains individually were also decreased significantly(P<0. 01)byincreasing SR,however,the output of lamb cancers per hectare of pasture arranged in order of medium>low>high SR. It is found that the dally lamb weight gains correlated positively(r=0. 98)with the dailyintake of lamb, and negatively( r=-0.98 ) with the grazing pressure. SR affected lamb meat quality aswell. Compared with the low and high SR,the medium one performances the highest in both energyconversion and grassland productivity.It is considered that the medium SR would be the optimum one in theuse at mixed pasture system under the local conditions.

关 键 词：放牧率 草地 羔羊 转化效率 

分 类 号：S826.43[农业科学—畜牧学]