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Four rumen-cannulated dairy cows were fed either the control total mixed ration (TMR) or twicechopped TMR. PRV and the depth of rumen digesta were measured by a device we developed. It consisted of a rod inserted into the rumen, a load cell and a displacement transducer. The rumen mat was defined as the layer having a value over the break point on the line chart of the relationship between PRV and the depth of rumen digesta. The rumen digesta was entirely evacuated before feeding (0h) and 2h after feeding. The penetration resistance test was carried out for 24h at 2h intervals. Although reduction of particle size increased eating rate at each meal (P\u003c0.05), the dry matter intake and time spent eating and ruminating did not di er between the two diets. The total amount and the particle size distribution of rumen digesta were generally similar in the two diets, except that the weight of wet digesta at h for chopped TMR was greater than that for control TMR (P\u003c0.10). 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泌乳牛第一胃内容物の物理的性状の指標としての貫入抵抗値の評価
http://hdl.handle.net/10659/1713
http://hdl.handle.net/10659/1713308cae85-515b-469b-b557-e50ccdc22444
名前 / ファイル | ライセンス | アクション |
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S-438_Izumi.pdf (770.8 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2011-03-31 | |||||
タイトル | ||||||
タイトル | 泌乳牛第一胃内容物の物理的性状の指標としての貫入抵抗値の評価 | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
泉, 賢一
× 泉, 賢一× 坂本, 孝仁× 柴山, 草太× 辻, 秀雄 |
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著者別名 | ||||||
姓名 | IZUMI, Kenichi | |||||
言語 | en | |||||
姓名 | 泉, 賢一 | |||||
言語 | ja | |||||
著者別名 | ||||||
姓名 | SAKAMOTO, Takahito | |||||
著者別名 | ||||||
姓名 | SHIBAYAMA, Sota | |||||
著者別名 | ||||||
姓名 | TSUJI, Hideo | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 第一胃内の堅さと深さを測定するために第一胃内貫入抵抗測定装置を開発した。その装置を用いて切断長の異なる混合飼料を自由採食させた第一胃カニューレ装着泌乳牛4頭における第一胃内容物の貫入抵抗値(PRV)を調査し,第一胃内容物粒度分布や咀嚼活動との関連について検討した。通常の混合飼料(TMR)を給与した対照区と通常TMRをさらに2度切断した細断区の2処理を設けた。PRVを経時的に測定し,給与直前(0 h)と給与2時間後に第一胃内容物の全量採取を実施した。採食量に処理間差はなく,採食期の採食速度が細断区で速かった(P < 0.05)ことを除き採食行動あるいは反芻活動に処理による差はなかった。第一胃内容物のPRVおよび深さの平均値は両区とも12 Nおよび53 cmであった。第一胃上部に明瞭なマット層が存在する割合は対照区よりも細断区の方が高く,その厚さは対照区(31.4 cm)よりも細断区(37.0 cm)が上回る傾向にあった(P < 0.10)。0 hの第一胃内原物量が対照区よりも細断区で多い傾向(P < 0.10)にあったことを除き,内容物量および粒度分布に処理間差はなかった。本装置を用いることにより第一胃内容物の堅さやマット層を把握することが可能となり,第一胃内の物理的性状を評価する新たな指標としてPRVは有効であると考えられた。The aim of this study was to evaluate rumen fill by measuring the penetration resistance value (PRV) and the depth of rumen digesta, and to investigate the relationship between PRV, rumen fill and chewing activity in cows. Four rumen-cannulated dairy cows were fed either the control total mixed ration (TMR) or twicechopped TMR. PRV and the depth of rumen digesta were measured by a device we developed. It consisted of a rod inserted into the rumen, a load cell and a displacement transducer. The rumen mat was defined as the layer having a value over the break point on the line chart of the relationship between PRV and the depth of rumen digesta. The rumen digesta was entirely evacuated before feeding (0h) and 2h after feeding. The penetration resistance test was carried out for 24h at 2h intervals. Although reduction of particle size increased eating rate at each meal (P<0.05), the dry matter intake and time spent eating and ruminating did not di er between the two diets. The total amount and the particle size distribution of rumen digesta were generally similar in the two diets, except that the weight of wet digesta at h for chopped TMR was greater than that for control TMR (P<0.10). The average PRV and depth in control and chopped TMR were 12N and 53cm, respectively. The thickness of the rumen mat tended to be greater for chopped TMR than control TMR (P<0.10). This study suggests that the penetration resistance value is useful in evaluating the physical character of rumen digesta. | |||||
書誌情報 |
日本畜産学会報 en : The Japanese journal of zootechnical science 巻 79, 号 3, p. 361-368, 発行日 2008-08 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1346-907X | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.2508/chikusan.79.361 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
その他のタイトル | ||||||
その他のタイトル | Evaluation of penetration resistance value for the physical factor of rumen digesta in lactating dairy cows | |||||
出版者 | ||||||
出版者 | 日本畜産学会 | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article |