Nutritive value of pastures of Cynodon mixed with forage peanut in southwestern Paraná State

This study evaluated the nutritive value of pastures of Coastcross-1 and Tifton 85 mixed with increasing inclusion of forage peanut (0, 25, 50, 75% occupancy area), subjected to cuts, over two study years in Southwestern Paraná State. The experimental design was factorial (three factors) distributed in randomized block. The factors were cultivars (2), the occupancy area of forage peanut (4) and seasons of cuts (5), with three replications. It was evaluated the percentage of crude protein, neutral detergent fiber and in vitro digestibility of dry matter of leaf blades, stem + sheath of grasses and available forage mass of pastures. Values of crude protein ranged from 17.0 to 20.4% and from 16.8 to 19.3% for the forage mass available of Coastcross-1 and Tifton 85, respectively. Higher digestibility values were found at the beginning of evaluations. On average, the Coastcross-1 showed better nutritive value compared to Tifton 85, and, the inclusion of forage peanut increased crude protein content in leaf blades of grasses studied, in the second year after planted.

本研究于巴拉那州西南部开展，为期两年，旨在评估经刈割处理的、以不同梯度占比（0、25%、50%、75%种植面积）混播饲用花生（forage peanut）的Coastcross-1与Tifton 85牧场牧草的营养价值。本试验采用三因子析因随机区组设计，试验因子分别为牧草品种（2个）、饲用花生种植面积占比（4个梯度）与刈割季次（5个），每组设置3次重复。本研究测定了供试禾草的叶片、茎秆+叶鞘的粗蛋白（crude protein）百分比、中性洗涤纤维（neutral detergent fiber）百分比与干物质体外消化率（in vitro digestibility of dry matter），以及牧场可利用牧草生物量。针对Coastcross-1与Tifton 85的可利用牧草生物量，其粗蛋白含量分别为17.0%~20.4%与16.8%~19.3%。在试验评估初期可观测到更高的干物质体外消化率数值。整体而言，Coastcross-1的营养价值优于Tifton 85；在混播种植后的第二年，提高饲用花生的种植占比可提升供试禾草叶片的粗蛋白含量。