Improving the accuracy of estimating blood calcium concentration in Holstein cows using electrocardiographic variables
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- ITOH Megumi
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
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- NAKAJIMA Yasuhiro
- Industrial Research Center, Hokkaido Research Organization, Kita 19, Nishi 11, Kita-ku, Sapporo, Hokkaido 060-0819, Japan
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- KUWANO Kouki
- Industrial Research Center, Hokkaido Research Organization, Kita 19, Nishi 11, Kita-ku, Sapporo, Hokkaido 060-0819, Japan
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- MAEDA Daisuke
- Industrial Research Center, Hokkaido Research Organization, Kita 19, Nishi 11, Kita-ku, Sapporo, Hokkaido 060-0819, Japan
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- SAKURAI Yoshie
- Animal Research Center, Hokkaido Research Organization, Sintoku, Hokkaido 081-0038, Japan
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- MATSUI Yoshitaka
- Dairy Research Center, Hokkaido Research Organization, Asahigaoka, Nakashibetsu, Hokkaido 086-1135, Japan
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- KAWAMOTO Satoshi
- School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunkyodai, Ebetsu, Hokkaido 069-8501, Japan
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抄録
<p>We previously reported the possibility of using the electrocardiogram variable to estimate blood calcium (Ca) concentration in dairy cows based on the strong positive correlation between the blood Ca concentration and the inverse of the corrected ST peak interval (STc−1). To improve the accuracy of the estimation of blood Ca concentration, we investigated the relationship between blood Ca concentration and STc−1 for each postpartum day and available variables other than STc−1. We measured multiple variables (milk yield, calving number, age, body temperature, etc.), including serum total Ca concentration (tCa), blood ionized Ca concentration (iCa) and STc−1 in 462 Holstein cows on days 0, 1, 2, 3, 5, and 7 postpartum. A very high correlation was observed between iCa and tCa. The association between tCa and STc−1 for each postpartum day had a high coefficient of determination of 0.61–0.79 postpartum 0–2 days but decreased after the third day. In the investigation using the data from postpartum days 0–2, STc−1, heart rate interval, calving number, and age were highly correlated with tCa. In addition, a multiple regression equation was obtained with tCa as the objective variable and STc−1 and calving number as explanatory variables. The estimation accuracy was improved as compared with the simple regression equation using only STc−1 as the explanatory variable. This multiple regression equation was used for 11 cows suspected of having hypocalcemia, and it was able to correctly detect cows requiring early treatment, except for one cow.</p>
収録刊行物
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- Ｔｈｅ Ｊｏｕｒｎａｌ ｏｆ Ｖｅｔｅｒｉｎａｒｙ Ｍｅｄｉｃａｌ Ｓｃｉｅｎｃｅ
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Ｔｈｅ Ｊｏｕｒｎａｌ ｏｆ Ｖｅｔｅｒｉｎａｒｙ Ｍｅｄｉｃａｌ Ｓｃｉｅｎｃｅ 84 (2), 193-198, 2022
公益社団法人 日本獣医学会