Nitrogen Deposits of Lamb as Influenced by Rotational Grazing

doi:10.11733/j.issn.1007-0435.2000.04.008

›› 2000, Vol. 8 ›› Issue (4): 289-296.DOI: 10.11733/j.issn.1007-0435.2000.04.008

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Nitrogen Deposits of Lamb as Influenced by Rotational Grazing

Bai Keyu, Han Jianguo, Wang Pei

Institute of Grassland Science, China Agricultural University, Beijing 100094

Online:2000-11-15 Published:2000-11-15

放牧强度对羊氮素贮量动态变化的影响

白可喻, 韩建国, 王培

中国农业大学草地研究所, 100094

基金资助:
国家96-016-01-04科技攻关专题

Abstract

Abstract: The intake N ,deposition N,dung N, urine N and daily gain of lamb under three grazing intensities (LG 0.134hm²/lamb, MG 0.08hm²/lamb and HG 0.067hm²/lamb, with the increase of live weight, the grazing intensities were changed for LG:0.2hm²/sheep, MG:0.114hm²/sheep, HG:0.072hm²/sheep) were carried out on a pasture established using Russian Wildryegrass (Psathyrostachys juncea (Fishch) Nevski) during growing season (from June September) in 1997 at Yuershan Ranch in the north of Hebei province. The results show with the increase of grazing intensity, the intake N of lamb decreased (P>0.05), and the ratios of deposition of N to intake of N were ranked as MG>LG>HG,and the utilizable rate of digested N at medium grazing site was the highest. The daily gain of sheep in LG and MG was higher than in HG.

Key words: Grazing intensity, Nitrogen deposits, Lamb, Russian Wildryegrass

摘要： 在河北坝上鱼儿山牧场研究放牧强度对杂种公羔采食氮量、排泄氮量、沉积氮量及增重的影响。结果表明,随着放牧强度的增加,羊干物质采食量逐渐减少,同时采食氮量也相应减少,但差异不显著(P>0.05)。放牧强度对羊体沉积氮占食入氮比例的顺序为中牧>轻牧>重牧,消化氮的利用率也以中牧区最高。在轻牧与中牧区羊的日增重较快。

关键词: 放牧强度, 氮素贮量, 绵羊, 新麦草人工草地

Bai Keyu, Han Jianguo, Wang Pei. Nitrogen Deposits of Lamb as Influenced by Rotational Grazing[J]. , 2000, 8(4): 289-296.

白可喻, 韩建国, 王培. 放牧强度对羊氮素贮量动态变化的影响[J]. , 2000, 8(4): 289-296.

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Nitrogen Deposits of Lamb as Influenced by Rotational Grazing

放牧强度对羊氮素贮量动态变化的影响

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