Red clover (Trifolium pratense) and lucerne (Medicago sativa) are among the most common legume species used for ruminant feeding systems. Besides the greater nutritive quality and first‐year ley yield compared to lucerne, red clover decreases its yield over the years. However, under unfavourable soil conditions the persistency of lucerne can be compromised, not performing as expected. This study compared yield and chemical composition of eight lucerne cultivars and one tetraploid red clover cultivar, with similar growth capacity as lucerne, replicated over two years. In the second year, four lucerne cultivars and the red clover cultivar were analysed for crude protein (CP) fractions, dry matter and neutral detergent fibre (NDF) digestibility. A randomized block design was used with three field blocks per cultivar for the multiple comparisons within each year. There were differences in DM yield, concentrations of CP and NDF and CP fractions among the lucerne cultivars, but the differences were inconsistent between years and between growth cycles within year. The red clover cultivar had lower CP and NDF concentrations than a majority of the lucerne cultivars, and greater in vitro organic matter digestibility compared to all of the lucerne cultivars. Also, the red clover cultivar had greater rumen undegradable‐to‐degradable CP ratio but confirmed its lower yield persistency compared to the lucerne cultivars.

中文翻译：

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八个卢塞恩品种和一个红三叶草品种的营养价值和产量的两年比较

红三叶草（白三叶）和卢塞恩（紫花苜蓿）是反刍动物饲养系统中最常见的豆类物种之一。除了比卢塞恩具有更高的营养品质和头一年的莱利产量外，红三叶草多年来还降低了产量。但是，在不利的土壤条件下，卢塞恩的持久性可能会受到损害，无法达到预期的效果。这项研究比较了在两年内复制的8个卢塞恩品种和1个四倍体红三叶草品种的产量和化学组成，这些品种的生长能力与卢塞恩类似。第二年，分析了四个卢塞恩品种和红三叶草品种的粗蛋白（CP）组分，干物质和中性洗涤剂纤维（NDF）的消化率。随机分组设计用于每个品种三个田间块，用于每年内的多次比较。DM产量存在差异，紫花苜蓿品种中CP，NDF和CP组分的浓度较高，但年份之间以及一年中生长周期之间的差异并不一致。与所有苜蓿品种相比，红三叶草品种的CP和NDF浓度更低，体外有机物消化率更高。另外，红三叶草品种的瘤胃不可降解与可降解CP比率更高，但与卢塞恩品种相比，其单产持久性较低。与所有卢塞恩品种相比，其体外有机物消化率更高。另外，红三叶草品种的瘤胃不可降解与可降解CP比率更高，但与卢塞恩品种相比，其单产持久性较低。与所有卢塞恩品种相比，其体外有机物消化率更高。另外，红三叶草品种的瘤胃不可降解与可降解CP比率更高，但与卢塞恩品种相比，其单产持久性较低。