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題名 | 牛乳導電度之量測=Electrical Conductivity Measurement of Cows' Milk |
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作者 | 萬一怒; 林琮舜; 連振昌; 陳煥南; 徐慶霖; | 書刊名 | 畜產研究 |
卷期 | 31:1 1998.03[民87.03] |
頁次 | 頁87-100 |
分類號 | 473.7 |
關鍵詞 | 牛乳導電度; 乳房炎; 體細胞數; Electrical conductivity of milk; Mastitis; Somatic cell concentration; |
語文 | 中文(Chinese) |
中文摘要 | 牛乳導電度是由牛乳中離子的濃度來決定,通常在乳房炎發生的開始階段,牛乳 導電度即有所改變,因此檢測牛乳的導電度,可以達到即時檢測乳房炎發生的目的。研究顯 示,牛乳前乳之導電度經過16小時擠乳間隔,健康分房導電度值平均為6.2 mS/cm,經過8 小時擠乳間隔,健康分房導電度做平均為5.6 mS/cm,顯示擠乳間隔影響分房導電度值。當 感染乳房炎,經8小時擠乳間隔,分房前乳之導電度值平均為8.8 mS/cm,且其分房間導電 度值之差也較大,顯示感染乳牛與健康乳牛分房導電度有明顯的差異。研究顯示牛乳導電度 對乳房炎的感染有敏感的反應,可較體細胞數檢測與外表觀測,早數目有穩定的訊息。健康 乳牛各分房之平均體細胞數小於260,000 cells/ml,而感染分房體細胞數平均在879,000到 1,427,000 cells/ml之闐。所有分房之體細胞數與導電度間之相關係數為0.535,而非感染 分房之體細胞數與導電度間的相關係數為0.262。 |
英文摘要 | Electrical conductivity is determined by the ion composition of milk. Usually in the early stage of inflammation of the udder, the conductivity of milk has been changed. Therefore, by measuring electrical conductivity, the goal of early detection of mastitis can be achieved. From the study of electrical conductivity of foremilk, after 16 hours milking interval, the average conductivity of healthy quarters was 6.2 mS/cm and after 8 hours milking interval, the average conductivity of healthy quarters was 5.6 mS/cm, which showed the effect of the length of milking interval. In an inflammatory condition, the conductivity increased, and after 8 hours milking interval, the average conductivity of quarters from foremilk was 8.8 mS/cm. The variance of maximum difference among quarters increased too. This showed the difference of conductivity between healthy and inflamed quarters was obvious. Study showed the electrical conductivity had higher sensitivity to mastitis than somatic cell count and appearance inspection. It had stable signal several days earlier than the other methods. The somatic cell concentration of healthy quarters was less than 260,000 cells/ml, and the somatic cell concentration of quarters of stale cows was between 879,000 to 1,427,000 cells/ml. The correlation coefficient of cell count and conductivity of healthy and inflamed quarters is 0.535, the value being 0.262 with only healthy quarters. |
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