@article{oai:iwate-u.repo.nii.ac.jp:00009300, author = {生田, 健太郎 and 岡田, 啓司 and 佐藤, 繁 and 安田, 準}, issue = {4}, journal = {産業動物臨床医学雑誌}, month = {Dec}, note = {泌乳牛が暑熱ストレスを受けた場合,どの血液成分が,どのように変化するかを明らかにすると共に,飼料摂取状況や乳生産性との関連性を検討するため,乳牛45頭を分離給与または完全混合飼料(TMR)給与で飼養管理し,1年間に渡って毎月代謝プロファイルテストを実施した.得られた延べ277頭のデータを給与法毎に適温期と暑熱期(6~9月)に分け,各調査項目を比較した.分離給与では適温期に延べ81頭,暑熱期に延べ43頭のデータが得られた.これらを比較した結果,乾物摂取量(DMI, p<0.05),代謝エネルギー摂取量(p<0.01),乳量(p<0.01),乳脂率(p<0.05),乳蛋白質率 (p<0.001),ヘマトクリット(Ht, p<0.001),血糖(p<0.001),血清総コレステロール(p<0.01),リン 脂質(p<0.001),総蛋白質(p<0.05),カルシウム(p<0.01)およびアスパラギン酸アミノトランスフェラーゼ(AST, p<0.05)が暑熱期に有意な低値を示し,血清β-リポ蛋白(BL, p<0.001)が有意な高値を示した.一方,TMR給与では適温期に延べ110頭,暑熱期に延べ43頭のデータが得られた.これらを比較した結果,飼料摂取状況と乳量に差はなかったが,乳脂率(p<0.05)と乳蛋白質率(p<0.01),Ht(p<0.001)および血清AST(p<0.01)が暑熱期に有意な低値を示し,血清BL(p<0.001)とアルブミン(p<0.01)が有意な高値を示した.以上のように,分離給与では暑熱期にDMIと乳量が低下し,血液成分は13項目中8項目に変化がみられた.一方,TMR給与では暑熱期でもDMIと乳量が低下せず,血液成分は4項目にのみ変化がみられた.従って,暑熱による泌乳牛の血液成分の変化は飼料摂取状況や乳生産性が受けた影響によって異なることが示唆された., Effects of heat stress on blood profiles, feed intake and lactation performance during the hot season were examined in 45 dairy cows, which were either on separate feeding or on total mixed rations (TMR). Feed intake, lactation performance and blood profiles were examined once a month over a year. Accumulated 277 data sets were analyzed separately for separate feeding and TMR feeding and compared between the hot season (June to September) and optimum temperature period. In the separate feeding group, 43 data sets were obtained during the hot season, and 81 during the optimum period. During the hot season, dry matter intake (DMI, p<0.05), metabolizable energy intake (p<0.01), milk yield( p<0.01), % milk fat( p<0.05), % milk protein( p<0.001), blood glucose( p<0.001), total cholesterol (p<0.01), phospholipids (p<0.001), hematocrit (Ht, p<0.001), total protein (p<0.05), calcium (p<0.01) and aspartate aminotransferase (AST, p<0.05) were significantly lower, and betalipoprotein (BL, p<0.001) was significantly higher compared to those during the optimum period. In the TMR group, 43 data sets were obtained during the hot season, and 110 during the optimum period. Although DMI and milk yield did not differ between the two seasons, % milk fat (p<0.05), %milk protein (p<0.01), Ht (p<0.001) and AST (p<0.01) were significantly lower, and BL (p<0.001)and albumin (p<0.01) were significantly higher during the hot season compared to those during the optimum period. Thus, changes in blood profiles were more frequently observed in cows on separate feeding than in those on TMR feeding. As the separate feeding system resulted in decreased DMI and milk yield during the hot season and TMR feeding did not, the effects of heat stress observed in blood profiles seem to be the results of altered feed intake and lactation performance.}, pages = {190--196}, title = {暑熱が泌乳牛の血液成分値に及ぼす影響}, volume = {1}, year = {2010} }