引言在反刍动物粪便覆盖的地方曾发现生长出许多种类的植物幼苗(Ozer 1979),这在生产实践中具有一些实际意义。例如,通过放牧管理可以人为地扩散优良牧草的种子,而对不良牧草种子的扩散加以限制。有意识地给家畜饲喂优良牧草的种子,使其随家畜粪便而撒播到放牧草地上。家畜消化道对一些热带牧草种子生活力的影响已有报道(Simao Neto 等1987,Jones 和 Simao Introduction Many species of plant seedlings have been found in areas covered by ruminant manure (Ozer 1979), which has some practical implications in production practice. For example, grazing can artificially disperse fine forage seeds while limiting the spread of undesirable forage seeds. Carefully feed livestock with fine forage seeds that are sown to grazing grass with livestock excrement. The effects of livestock digestive tract on the viability of some tropical pasture seeds have been reported (Simao Neto et al 1987, Jones and Simao