THE EFFECT OF REDUCED LEAF SHEAR-STRENGTH ON THE NUTRITIVE-VALUE OF PERENNIAL RYEGRASS
THE EFFECT OF REDUCED LEAF SHEAR-STRENGTH ON THE NUTRITIVE-VALUE OF PERENNIAL RYEGRASS
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DOI：
10.1017/s0021859600083659
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发表时间：
1988-12-01
影响因子：
2
通讯作者：
SEDCOLE, JR
中科院分区：
文献类型：
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作者：
MACKINNON, BW;EASTON, HS;SEDCOLE, JR
选择低和高叶剪切强度的多年生黑麦草（PRG）植物的后代[Luppelperenne]在空间植物田间试验中播种，并显示在相同方向上的叶强度不同，证实这是一个可遗传的性状。选择低叶片剪切强度也降低了单位叶长的重量，但对干物质（D.M.）百分比、生长评分、锈病评分或抽穗后趋势。D.M.的价格消耗量（克干物质/ min）和D.M.使用聚酯袋技术，然后用少量的两个PRG选择系以及白色三叶草[Trifoliumrepens]，使用饲喂新鲜的黑麦草/白色三叶草牧草的基础饮食的绵羊来测定。选择抗剪强度低的PRG，纤维素和半纤维素含量略有降低，全氮含量略有增加，D.M.绵羊的采食量（17%），但对瘤胃消化率没有影响。降解因此，选择将PRG的营养特性向白色三叶草的方向移动。对选择的第一个营养反应似乎是更快的D. M。消费，并认为叶片剪切强度有潜力选择PRG与反刍动物的自愿摄入率增加。
Progeny of perennial ryegrass (PRG) plants [Lulium perenne] selected for low and high leaf shear strength were sown in a spaced-plant field experiment and were shown to differ in leaf strength in the same direction, confirming this to be a heritable trait. Selection for low leaf shear strength also reduced weight per leaf length, but had no effect on dry-matter (D.M.) percentage, growth score, rust score or tendency towards aftermath heading. Rates of D.M. consumption (g D.M./min) and ruminal degradation of D.M. using the polyester bag technique, were then determined with small quantities of the two PRG selection lines, and also white clover [Trifolium repens], using sheep fed a basal diet of fresh ryegrass/white clover pasture. Selecting PRG for low leaf shear strength slightly reduced concentrations of cellulose and hemicellulose, slightly increased total N concentration and increased rate of D.M. consumption by sheep (17%) but had no effect on rates of ruminal D.M. degradation. The selection thus moved the nutritional characteristics of PRG in the direction of white clover. The first nutritional response to the selection appears to be a faster rate of D.M. consumption, and it is considered that leaf shear strength has potential for selecting PRG with increased rates of voluntary intake by ruminants.