Nutritive value of grasses of genus Cynodon mixed with forage peanut

ABSTRACT The goal of this study was to evaluate the fodder performance and production of Cynodon (Cv. Tifton 85 or Coastcross) mixed with Arachis pintoi (Forage peanut). The experiment was conducted at the Universidade Tecnológica Federal do Paraná, Câmpus Dois Vizinhos, at an area of approximately 3000m2. A completely randomized block design was applied, with four treatments and three replicates. The treatments were: Tifton 85 and Coastcross in pure crop, Tifton 85 + AF and Coastcross + AF with rotated and successive implantation of one line to the grass and three consecutive lines to the legume. The content of CP, NDF, ADF, IVDMD ashe and DM of the leaf blades, stem of grasses forage peanut and total forage mass available of grazing simulation was evaluated. Coastcross has lower fibrous contents, regardless of treatment. The changing of the seasons during the year provided lower values of CP and IVDMD for all treatments. The evaluation of the grazing simulation showed that Tifton 85 has higher DM values just as the lower ones are found for consortia. When mixed with grasses, forage peanuts reduce the fibrous compounds on pasture, increasing the CP levels in grass pasture at the end of productive cycle.

**摘要** 本研究旨在评估狗牙根属（Cynodon）Tifton 85品种（Cv. Tifton 85）或海岸十字（Coastcross）与平托花生（Arachis pintoi，饲用花生）混播的饲用性能与生产表现。试验于巴拉那联邦理工大学杜伊斯维纽斯校区开展，试验地块面积约3000平方米。试验采用完全随机区组设计，设置4个处理组与3次重复。处理组分别为：单播Tifton 85、单播海岸十字，以及Tifton 85+平托花生（AF）、海岸十字+平托花生（AF），混播模式为1行牧草与3行豆科作物连续交替种植。本研究测定了叶片、牧草茎秆、饲用花生的粗蛋白（CP, Crude Protein）、中性洗涤纤维（NDF, Neutral Detergent Fiber）、酸性洗涤纤维（ADF, Acid Detergent Fiber）、体外干物质消化率（IVDMD, In Vitro Dry Matter Digestibility）、灰分（ashe）与干物质（DM, Dry Matter）含量，并评估了模拟放牧条件下的可利用总饲用生物量。无论采用何种处理方式，海岸十字的纤维组分含量均较低。年内季节更替导致所有处理组的粗蛋白与体外干物质消化率均有所降低。模拟放牧评估结果显示，Tifton 85的干物质含量更高，而混播组的干物质含量更低。当与牧草混播时，饲用花生可降低牧场内的纤维类化合物含量，在生产周期末期提升牧草牧场的粗蛋白水平。