2021 Fiscal Year Final Research Report
Availability of autumn-saved dwarf napiergrass pasture for foggage grazing use as one of year-round grazing use
| Project/Area Number |
19K06371
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 42010:Animal production science-related
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| Research Institution | University of Miyazaki |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
井戸田 幸子 宮崎大学, 農学部, 教授 (40325733)
石垣 元気 宮崎大学, 農学部, 講師 (80584573)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 暖地型牧草矮性ネピアグラス / 繁殖牛放牧 / 霜枯れ草 / 秋季休牧（ASP） / 周年放牧 / 日増体量 / 牧養力 |
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| Outline of Final Research Achievements |
The present study examined a year-round grazing feasibility on dwarf napiergrass pasture in the summer growing season (summer) and the winter foggage period (winter) from the 2017-2018 to the 2021-2022 periods. Two genotypes of DL and 7734 dwarf napiergrass, which were established with vegetative nursey plants in 2016-2018, were allocated into 4 paddocks (500 m2/paddock) for each genotype and fertilized three times equally with 16.8 g/m2/year of N, P2O5 and K2O, each.
Three head Japanese-Black breeding cows were rotationally stocked with two cycles in 48-59 days for summer and with one-cycle in 28-42 days for winter. Daily gains were 0.79, 0.63, 0.66 and 1.11 kg/head/day for summer and were 0.71, -0.27, 0.62 and -0.08 kg/head/day for winter in four years.
The present study revealed that dwarf napiergrass persisted a permanent pasture with the precise fertilization and clearing of stubbles in spring to demonstrate the stable carrying capacity for at least 6 years in southern Kyushu.
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| Free Research Field |
飼料作物（草地学）
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により，0.4ha（繁殖牛経営の耕地面積の約20％）を矮性ネピアグラス永年草地に造成すれば，黒毛和種繁殖牛3頭を夏季と冬季の年間3か月（88～98日）間飼料補給なしで輪換放牧利用でき，DGは2か年度の冬季を除き，0.6～1.1 kg/頭/日が得られ，十分な牧養力を発揮できることが示された．
草地管理としては，定期的な施肥の実施と早春の枯死株の掃除刈だけで，造成後少なくとも6年間永年草地を維持でき，その牧養力も低下する傾向が認められないことも実証された。
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