Effect of Dissemination of Seeds along with Cattle Dung on the Propagation of Kentucky bluegrass (Poapratensis L.). : 1. Recovery and viability of seeds passaged through digestive tract of cattle.

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  • ケンタッキーブルーグラス(Poa pratensis L.)の種子繁殖と放牧家畜の排糞による種子散布 : 1.種子の糞中排出と排出種子の発芽
  • ケンタッキー ブルーグラス Poa pratensis L ノ シュシ ハンショク ト ホウボク カチク ノ ハイフン ニ ヨル シュシ サンプ 1 シュシ ノ フン チュウ ハイシュツ ト ハイシュツ シュシ ノ ハツガ

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This study was conducted to investigate the effect of dissemination of seeds along with cattle dung on the propagation of Kentucky bluegrass (Poa pratensis L.). In this report, the results of experiments were presented on the comparison of recovery and viability of the seeds of Kentucky bluegrass and other two forage grass species passed through the digestive tract of cattle. In addition, the results of observation of the seasonal changes in the species and number of seeds in cattle dung on the pasture where is dominated by Kentucky bluegrass at the Alpine Region of the National Grassland Research Institute with about 1,200 m altitude in central Japan are reported. Each of three Japanese black cattle, whose body weight was 260-273 kg, was fed a mixture containing 250 g of seeds of each of Kentucky bluegrass, orchardgrass (Dactulis glomerata L.) and perennial ryegrass (Lolium perenne L.), and 2.5kg of concentrate feed. The maximum recovery of seeds occurred in the dung defecated within 24-48 hrs after feeding in all species, and 80-90% of the total recovered seeds were recovered in the first 72 hrs after feeding. The percentage of recovery was highest for Kentucky bluegrass (51.4%), followed by perennial ryegrass (47.7%), and orchardgrass (16.7%). By the passage of seeds through the digestive tract of cattle, the germination percentage decreased in every species. The percentage of germination of seeds recoyered was highest in Kentucky bluegrass(64.3%), lowest in orchardgrass (3.9%), and intermediate in perennial ryegrass (44.0%). Based on these results, it was concluded that Kentucky bluegrass is much more resilient after dissemination in cattle dung than the other two species. As a result of the investigation of the experimental pasture, 19 species of plants were observed. Among the species, the seeds of seven species of plants were observed in the dung pats on pasture. The number of seeds of Kentucky bluegrass was maximum in the dung pats. The seeds of Kentucky bluegrass were observed in the dung pats from the beginning of July to the middle of August, and maximum recovery occurred in the middle of July.

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