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Provedor de dados:  OAK
País:  Japan
Título:  北海道における乳中尿素窒素濃度(MUN)に及ぼす環境要因効果の推定
Effect of Environmental Factors on Milk Urea Nitrogen Concentrations in Holstein Cows in Hokkaido
Autores:  西村, 和行
三浦, 伸也
鈴木, 三義
NISHIMURA, Kazuyuki
MIURA, Sinya
SUZUKI, Mitsuyoshi
Data:  2005-03
Ano:  2005
Palavras-chave:  乳中尿素窒素濃度
分娩年齢
季節
ステージサブクラス
牛群・検定日効果
Milk Urea Nitrogen
Age-Season-DIM subclass
Herd-Test Day
Resumo:  This study aimed to estimate the effects of environmental factors on milk urea nitrogen (MUN) concentrations using field data collected by Dairy Cattle Milk Recording & Testing programs. Data consisted of 5,797,500 test-day records of MUN and milk yields,and fat and protein obtained from 5,266 Holstein herds in Hokkaido,Japan. Data were divided into four sets by parities of one,two,three and over four. ANOVA was used for data analysis. Herd-test-day (HTD) effects,Calving Age X Season (AS) effects and the lactation stage had significant effects on MUN,with concentrations tending to increase from the peak of lactation until it ended. この研究の目的は午群検定事業で収集された7ィールドデータにおける乳中尿素窒素濃度(MUN)に及ぽす環境要因の解析を行うことであった.分析に用いたデータは,北海道の5,266牛群のホルスタイン種雌午から得られたMUNおよび乳量,脂肪量およびタンパク質量に関する5,797,500の検定日記録であった. データは初産,2産,3産および4産以上の4つのデータセットに分割した.これらのデータの解析には分散分析法を用いた.群-検定日(HTD)効果,分娩年齢・季節効果および泌乳ステージ(DlM)効果はMUNに有意な影響を及ぼした. MUN 濃度は泌乳ピーク時から乳期終了まで増加傾向にあった.

http://www.h7.dion.ne.jp/~hokutiku/kaihou.htm
Idioma:  Japonês
Identificador:  http://ir.obihiro.ac.jp/dspace/handle/10322/3420
Editor:  北海道畜産学会
Formato:  application/pdf
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