Forage Quality and Performance of Yearlings Grazing Switchgrass Strains Selected for Differing Digestibility
Forage Quality and Performance of Yearlings Grazing Switchgrass Strains Selected for Differing Digestibility
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DOI：
10.2527/jas1988.6692239x
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发表时间：
1988-09
影响因子：
3.3
通讯作者：
B. Anderson;J. Ward;K. Vogel;M. Ward;H. Gorz;F. A. Haskins
中科院分区：
文献类型：
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作者：
B. Anderson;J. Ward;K. Vogel;M. Ward;H. Gorz;F. A. Haskins
柳枝稷（Panicum virgatum）是一种多年生暖季型牧草，常用作夏季牧草。在3个重复放牧试验中，用一岁牛（Bos taurus）对具有不同体外DM消失（IVDMD）值的3个柳枝稷品系进行了评价。“开拓者”（高IVDMD）的ADG高于“开拓者”和“低IVDMD”（P <0.05）。开拓者的有效牧草IVDMD高于开拓者，IVDMD低于开拓者。在整个季节中，各菌株之间的IVDMD差异相似; IVDMD每天下降0.3至0.5个百分点。牧草利用率、粗蛋白质、中性洗涤纤维和酸性洗涤纤维、高锰酸盐木质素和灰分在不同菌株间差异不大。本研究证明，植物育种者可以选择具有较高IVDMD的柳枝稷植物，并且由这些植物的后代组成的菌株可以导致比具有相似遗传背景、牧草产量、成熟度、形态和化学组成的低或低qVDMD植物的后代的菌株更高的动物增益。(
Switchgrass (Panicum virgatum) is a native, perennial warm-season grass commonly used as summer pasture. Three strains of switchgrass with different in vitro DM disappearance (IVDMD) values were evaluated with yearling cattle (Bos taurus) in three replicated grazing trials All strains were similar in genetic background, maturity and yield potential. 'Trailblazer' (high-IVDMD) resulted in higher (P < .05) ADG than 'Pathfinder' and 'low-IVDMD'. Available forage of Trailblazer had higher IVDMD than Pathfinder and low-IVDMD. The IVDMD differences among strains were similar throughout the season; IVDMD declined between .3 and .5 percentage units per day. Forage availability, CP, NDF and ADF, permanganate lignin and ash were similar among strains. This study documents that plant breeders can select switchgrass plants for higher IVDMD and that strains consisting of progeny of these plants can result in higher animal gains than strains cons.isting of progeny of unselected or lowqVDMD plants with similar genetic background, forage yield, maturity, morphology and chemical composition. (