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在冬季用上一个生长季生长的暖季禾草立枯物饲喂怀孕的肉用母牛可能是阿根廷半干旱的潘帕地区放牧系统的一种替代。1990～1991比较了4种暖季禾草:柳枝稷、具色稷、Tetrachne.dregei和弯叶画眉草在上个生长季生产的冬季牧草品质。夏季生长的牧草从初霜开始,整个冬季刈割5次,间隔相等。测定草层生物量的干物质变化,牧草子样品分为叶和茎,品质分析包括粗蛋白(CP)、体外干物质消化率(IVDMD)、瘤胃有效降解率(ED)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)及木质素。T.dregei的饲草茎叶比和品质通常比其它高,但差异并不显著。其粗蛋白含量明显地低于奶牛的维持需要。T.dregei的干物质产量低于弯叶画眉草,但差异仅在1990年显著。尽管在评价的4种草中具色稷比例最低,但其品质和干物质产量一般较高。柳枝稷产量最低,饲料的营养价值低,与弯叶画眉草相当或更低。尽管叶片和茎的营养价值无法用统计数字作比较,但叶的营养价值有比茎更高的趋势。本项研究中评出的最佳的草种是T.dregei,利用前景良好,能为该地区冬季放牧系统提供有营养的牧草。
Feeding pregnant cows in warm winter grasses growing in the previous growing season in winter may be an alternative to the grazing system in the semi-arid Pampa area of Argentina. 1990 ~ 1991 The winter pasture quality of four warm-season grasses: switchgrass, turkey, Tetrachne.dregei and angustifolia was compared during the last growing season. Summer grass growing from the initial frost, mowing throughout the winter 5 times, the same interval. The dry matter changes of the grass biomass were measured. The forage grass samples were divided into leaves and stems. The quality analysis included crude protein (CP), in vitro dry matter digestibility (IVDMD), rumen effective degradation rate (ED), neutral detergent fiber NDF) and acid detergent fiber (ADF) and lignin. T.dregei forage grass-leaf ratio and quality are usually higher than the other, but the difference is not significant. Its crude protein content is significantly lower than the maintenance needs of dairy cows. T.dregei's dry matter yield was lower than Curcuma longifolia, but the difference was only significant in 1990. Although the lowest proportion of the four grasses was evaluated, their quality and dry matter yield were generally higher. The lowest yield of switchgrass, the low nutritional value of feed, is comparable to or lower than Curcuma longifolia. Although the nutritional value of leaves and stems can not be compared with the statistics, the nutritional value of leaves has a higher tendency than the stems. The best grass species identified in this study is T.dregei, which has good prospects for use and provides nutritious forage for the winter grazing system in the area.