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牧草中的氮(N)可分为中性和酸性洗涤剂溶解N(NDFN和ADFN)和不溶解N,用以粗略估计可迅速分解N(NDFN)和缓慢分解N(计算式NDFN-ADFN),称以上为瘤胃中可利用纤维N(AFN)和不能利用N(ADFN)。本文对紫花苜蓿、红三叶、猫尾草和无芒雀麦不同牧草种类、生长期和植株部位的总N、NDFN和ADFN含量进行了分析测定。豆科牧草叶、茎和全株的ADFN含量分别是禾本科牧草的2倍。四种牧草叶NDFN含量依次为9.8、26.4、8.6和6.4g/kgNDF,茎为4.2、4.6、3.2和2.4g/kgNDF;叶ADFN含量依次为4.6、5.3、2.0和1.6g/kgADF,茎为3.4、3.3、1.4和1.4g/kgADF。牧草茎、叶和全株的总N、NDFN和ADFN含量随牧草成熟而增加。茎中49％的NDFN是ADFN,叶中为21％。
Nitrogen (N) in pasture can be divided into neutral and acidic detergent dissolved N (NDFN and ADFN) and insoluble N for a rough estimate of rapidly decomposable N (NDFN) and slowly decomposed N (formula NDFN-ADFN) , Claiming that the above is rumen available fiber N (AFN) and not available N (ADFN). In this paper, the contents of total N, NDFN and ADFN in alfalfa, red clover, Timothy grass and Bromus luteuswere different grass species, growth period and plant parts were analyzed and determined. Leguminous pasture grass, leaves and stems, and whole plant ADFN content were two times the pasture grass. The NDFN contents of the four species were 9.8, 26.4, 8.6 and 6.4 g / kg NDF, and the stems were 4.2, 4.6, 3.2 and 2.4 g / kg NDF. The leaf ADFN contents were 4.6, 5.3, 2.0 and 1.6 g / 3.3, 1.4 and 1.4 g / kg ADF. The contents of total N, NDFN and ADFN in the stems, leaves and whole plant of forage increased with the forage maturation. 49% of the NDFNs in the stems are ADFNs and 21% in leaves.