分娩前および分娩後における乳牛の心拍数と熱発生量の関係について

概要

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1. Heart rate (HR) and heat production (HP) were measured simultaneously using a head cage for six pre- and postpartum Holstein cows. 2. HR after parturition decreased as compared with prepartum, but conversely, HP increased significantly after parturition. 3. The regression of HP on HR was significant in all cases. The accuracy of prediction error (PE, Sy•x), expressed as a percentage of y was ±4.8% (range ±2.4-6.8%). However. there were wide differences in the values of the regression constants between pre- and postpartum groups and also among individuals of the same group. 4. For pre- and postpartum dairy cows, the following equations for the estimation of HP from HR were determined to eliminate the need to calibrate for each individual cow.Prepartum: Y=0.962+5.335X, Y=HP (kcal/W0.75•h), X=RHR (RHR=HR/85.8)Postpartum: Y=0.535+7.502X, Y=HP (kcal/W0.75•h), X=RHR (RHR=HR/70.9)The mean values of basic HR are 85.8 and 70.9 (beats/min) in pre- and postpartum, respectively. 5. A better way to estimate HP from the above linear regression would be to us a mean group HR with a minimum of 4-6 cows, in order to correct for differences in individual HR.
社団法人日本畜産学会の論文