The lack of nitrogen (N) input on pastures is the main limiting factor to increase animal performance in tropical regions. This 2.5-year study assessed animal performance, forage intake and digestion, and N metabolism responses of three pasture treatments: (1) mixed Marandu palisadegrass—Brachiaria brizantha (Hochst. ex A. Rich.) R.D. Webster (syn. Urochloa brizantha Stapf cv. Marandu)—and forage peanut (Arachis pintoi Krapov. & W.C. Greg. cv. BRS Mandobi) pastures (GRASS + LEGUME), (2) monoculture Marandu palisadegrass pastures with 150 kg of N/ha (GRASS + N), and (3) monoculture Marandu palisadegrass without N fertilizer (GRASS). Continuous stocking with variable stocking rate was used with a target canopy height of 20 to 25 cm. The average daily gain was greatest at GRASS + N and GRASS + LEGUME (p = .081). GRASS + N pasture had greatest stocking rate and liveweight gain per area (p < .001 and p < .001, respectively), followed by GRASS + LEGUME pasture. No differences between treatments were found for the dry matter forage intake (p = .729); however, GRASS + N and GRASS + LEGUME pastures had greater crude protein and digestible organic matter intakes than GRASS pasture (p = .007 and p = .083, respectively). Greatest microbial protein synthesis and efficiency of microbial synthesis were found for GRASS + N and GRASS + LEGUME pastures (p = .016 and p = .067, respectively). Apparent efficiency of N utilization and microbial protein/CP intake ratio was greatest at GRASS + LEGUME pastures (p = .009 and p = .042, respectively). Nitrogen application or the integration of forage peanut in grass pasture increases animal performance, forage digestibility, and microbial protein synthesis.

中文翻译：

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含或不含氮或与饲料花生混合的 Palisadegrass 牧场放牧至相似的目标冠层高度。2. 对动物生产性能、饲料摄入和消化、氮代谢的影响

牧场缺乏氮 (N) 输入是提高热带地区动物生产性能的主要限制因素。这项为期 2.5 年的研究评估了三种牧草处理的动物性能、饲料摄入和消化以及氮代谢反应：(1) 混合 Marandu palisadegrass - Brachiaria brizantha (Hochst. ex A. Rich.) RD Webster (syn. Urochloa brizantha Stapf cv . Marandu）—和饲料花生（Arachis pintoi克拉波夫。＆WC 格雷格。简历。BRS Mandobi) 牧场（草 + LEGUME），(2) 单一栽培马兰杜栅栏草，每公顷氮含量为 150 公斤 (GRASS + N)，以及 (3) 不施氮肥的单一栽培马兰杜栅栏草 (GRASS)。使用可变放养率的连续放养，目标树冠高度为 20 至 25 厘米。GRASS + N 和 GRASS + LEGUME 的平均日增重最大 ( p =  .081)。GRASS + N 牧场的放养率和单位面积的活增重最高（分别为p  < .001 和p  < .001），其次是 GRASS + LEGUME 牧场。在干物质饲草摄入量方面没有发现处理之间的差异（p = .729); 然而，GRASS + N 和 GRASS + LEGUME 牧场的粗蛋白和可消化有机物质摄入量高于 GRASS 牧场（分别为p =  .007 和p =  .083）。最大的微生物蛋白质的合成和微生物合成的效率被发现为GRASS + N和GRASS +豆科牧草（p值=  0.016和P =  0.067，分别地）。氮利用与微生物蛋白/ CP摄取比例的表观效率为最大的在GRASS +豆科牧草（p值=  0.009和P = 分别0.042，）。施氮或在草场中掺入饲料花生可提高动物性能、饲料消化率和微生物蛋白质合成。