Association between agronomic characters and hay quality of sweet potato branches

ABSTRACT From the perspective of the use of sweet potato branches for animal feed, there is a lack of information on the influence of this action on hay quality. Therefore, the objective was to study the association of sweet potato yield attributes with chemical-bromatological characteristics of hay. Ten sweet potato clones were evaluated, conducted in randomized blocks with five replications. Green and dry mass yield, dry mass content, leaf and stem ratio, total and commercial root yield, and chemical and bromatological characteristics of hay from the branches were determined. Phenotypic correlation and trial analysis between characteristics were estimated. Selection for the highest yield of roots and commercial roots may provide increased hay of crude protein, neutral detergent fiber and acid and total soluble sugars. However, selection for the highest root yield has a negative effect on the starch content of hay and deserves special attention from the breeder.

摘要 从甘薯枝条用作动物饲料的应用视角出发，目前尚无关于该利用方式对干草品质影响的相关研究数据。因此本研究旨在探究甘薯产量性状与枝条所制干草的饲料化学营养特性之间的关联。本研究共评估了10个甘薯无性系，试验采用随机区组设计，设置5次重复。测定指标涵盖鲜重产量、干重产量、干物质含量、茎叶比、总根产量与商品根产量，以及枝条所制干草的饲料化学营养特性。本研究估算了各性状间的表型相关系数，并开展了性状间的试验分析。通过筛选高根产量与高商品根产量的甘薯品种，可提升干草中粗蛋白（crude protein）、中性洗涤纤维（neutral detergent fiber）、酸性洗涤纤维（acid detergent fiber）以及总可溶性糖的含量。但筛选高根产量的品种会对干草中的淀粉含量产生负面影响，这一点值得育种工作者重点关注。