{"created":"2023-05-15T09:57:59.531724+00:00","id":1848,"links":{},"metadata":{"_buckets":{"deposit":"5e89fc50-0764-466f-8735-34243ce65705"},"_deposit":{"created_by":5,"id":"1848","owner":"5","owners":[5],"pid":{"revision_id":0,"type":"depid","value":"1848"},"status":"published"},"_oai":{"id":"oai:miyazaki-u.repo.nii.ac.jp:00001848","sets":["74","74:32"]},"author_link":["2413"],"item_10007_description_13":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"【目的】\n宮崎市で多年利用可能なネピアグラス(Pennisetum purpureum)の矮性晩生品種(Dwarf-late;以下DL)草地に,晩秋にイタリアンライグラス(以下IR)を追播し,造成後2〜4ヵ年における黒毛和種肉用育成牛の輪換放牧体系の牧養力,増体性,草量および放牧前後のDLとIRの飼料品質を測定し,本体系の持続性を検討した。併せてDLの効率的増殖方法も検討した。\n【材料と方法】\n2002年5月6日に,DLの放牧草地4区(5a(20m×25m)/区)を,発根分げつ苗の栄養繁殖により,2株/m^2(畦間1m,株間50cm)の栽植密度で造成し,2004年5月5日に同様の区面積と密度で2区増設した。DL草地は,2002年では3頭の繁殖成牛(放牧開始時は451kg/頭)により,2003年では2〜3頭の育成牛(同359kg頭)により輪換放牧し,2004年および2005年では3頭の育成牛(同276kg/頭)により,6月下旬〜10月下旬に4周期放牧したが,放牧期間中に補助飼料は給与しなかった。放牧牛の生体重を11:00に測定し,放牧前後の草量を測定した。2003,2004年11月上旬のDL草地退牧時にIRを追播し,翌春の3月上旬〜4,5月下旬の放牧前後に,地表面5cm以上のIRと2004年の放牧前に地表面10cm以上のDLについて,葉身および(葉鞘を含む)茎のin vitro乾物消化率(IVDMD)と粗タンパク質(CP)含量を測定した。\n【結果と考察】\n1)5aのDL草地を6区造成すると,肉用繁殖育成牛3頭を輪換により6月下旬〜10月下旬の約4ヶ月間放牧利用でき,この全期間の日増体量は,2004年,2005年ではそれぞれ0.43kg/日,0.56kg/日であった。\n2)牧養力は,夏期のDL草地で両年とも約1000CD/haであり,放牧前後の草量は平均360g/m^2,210g/m^2であった。\n3)放牧牛の退牧時血液性状には特段の問題点はなかった。\n4)2004年のDL草地における放牧前のIVDMDとCP含量は,年間平均で64.1%と8.1%であり,IVDMDは暖地型イネ科牧草の平均値(約54%)に比べ高くなった。CP含量はいずれの周期も葉身より茎で低くなった。\n5)IRの2004年,2005年における放牧前後のIVDMDは,年間平均で80.5%,73.8%,CP含量各々11.9%,8.9%であった。\n6)沖縄県で越冬したDL苗圃から刈株の穂茎を採取する方法により,苗の効率的増殖が行えると考えられた。\nしたがって,本研究の結果から,DL草地に晩秋にIRを追播することで,暖地型牧草の平均より優れた粗飼料を長期間供給でき,放牧家畜の増体性も高く,沖縄県における苗の増殖を介し,省力的・環境保全的な飼養体系が確立されると実証された。\nObjectives : Dwarf napiergrass (Pennisetum purpureum Schumach) of a late-heading type (dwarf-late, DL), introduced by the Dairy Promotion Organization, Thailand, has a high over-wintering ability and is the most suitable variety for grazing in southern Kyushu, Japan. DL napiergrass pasture can be oversown with Italian ryegrass (Lolium multiflorum Lam., IR) in early November to extend the grazing period in the next spring. The objectives of this study were firstly to examine the herbage mass, digestibility and crude protein (CP) content of DL and IR both before and after rotational grazing in relation to the daily live-weight (LW) gain of cattle 4 years after establishment in the lowlands of Kyushu, Japan and secondarily to examine the laborsaving vegetative propagation method of DL napiergrass in Okinawa prefecture.\nMaterials and Methods : Four paddocks of DL pasture (5 a, 20m × 25m/paddock) were established by rooted tillers on May 6, 2002. The DL pasture was rotationally grazed by 3 breeding cattle (Japanese-Black) for 3 cycles from August to December in 2002 and by 2-3 beef cattle for 6 cycles from June to December in 2003. Another 2 paddocks of DL pasture were established on May 5, 2004, and were rotationally grazed by 3 raising beef cows with other 4 paddocks for 4 cycles from June to October in both 2004 and 2005. Cattle LW was measured at 1100 h when cattle switched paddocks, and no concentrate or roughage was fed during this rotational grazing. Initial LWs were 451,359,276 and 276 kg/head in 2002, 2003, 2004 and 2005, respectively. In vitro dry matter digestibility (IVDMD) and CP content were measured in the herbage cut at 10cm above the ground surface at every cycle in 2004 for DL napiergrass and at 5cm in 2004 and 2005 for IR.\nResults : 1)Live-weight of grazing cattle on DL pasture increased at 0.43-0.56 kg/head/day in 2004 and 2005. 2)The carrying capacities on DL pasture were more than 1000 Cow-day/ha in 2002-2005. 3)Annual mean CP content and IVDMD for DL napiergrass were 81 g/kg DM and 0.641, respectively, in 2004 and IVDMD was higher than the average of tropical grasses (0.54). Annual CP contents for IR were 119 and 89 g/kg DM in 2004 and 2005, respectively and IVDMD, 0.805 and 0.738, respectively. Nursery plants of DL napiergrass can be obtained by the laborsaving vegetative method, where the over-wintered tillers were sampled at Okinawa prefecture in March 2006.\nIn conclusions, this study demonstrates that DL pasture can be rotationally grazed by beef cows with higher quality of herbage than the average of tropical grasses, and the laborsaving vegetative method can be developed by transporting nursery tillers from Okinawa prefecture in spring.","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_10007_description_14":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"平成16年度～平成17年度科学研究費補助金基盤研究(C)研究成果報告書(課題番号16580223)","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_10007_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-06-21"}],"displaytype":"detail","filename":"kaken16580223.pdf","filesize":[{"value":"695.8 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"kaken16580223.pdf","url":"https://miyazaki-u.repo.nii.ac.jp/record/1848/files/kaken16580223.pdf"},"version_id":"6efaeee8-30bb-4773-8001-ed861b31037c"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"畜産学・草地学, 矮性ネピアグラス, 輪換放牧, 肉用繁殖牛, 増体量, 飼料品質, イタリアンライグラス追播, 苗の増殖","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"Rotational grazing, Grassland Science, Dwarf napiergrass, Breeding beef cows, Live-weight gain, Forage quality, Oversowing of Italian ryegrass, Vegetative propagation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_researcher":{"attribute_name":"研究代表者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"石井, 康之","creatorNameLang":"ja"},{"creatorName":"イシイ, ヤスユキ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{},{}]}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"矮性ネピアグラスの放牧利用による省力的・環境保全的な繁殖牛飼養体系の確立","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"矮性ネピアグラスの放牧利用による省力的・環境保全的な繁殖牛飼養体系の確立","subitem_title_language":"ja"},{"subitem_title":"Establishment of feeding system of breeding beef cows under the labor-saving and environment-conservative methods by the rotational grazing on the dwarf napiergrass pasture","subitem_title_language":"en"}]},"item_type_id":"10007","owner":"5","path":["74","32"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2007-12-26"},"publish_date":"2007-12-26","publish_status":"0","recid":"1848","relation_version_is_last":true,"title":["矮性ネピアグラスの放牧利用による省力的・環境保全的な繁殖牛飼養体系の確立"],"weko_creator_id":"5","weko_shared_id":-1},"updated":"2023-07-30T08:34:48.773969+00:00"}