The electrocardiographic(ECG) parameters oo the standard limb leads in the normal Korean native cattle have been measured with a 3 channel Electrocardiograph built in a computed analysis. The study was conducted on the animals 98 heads of mean age of 17.7 months. Conduction parameters, waves, intervals and segments have been recotded. The recordings were analyzed as to shape and amplitude of the P and T waves and the components of the QRS complex. Heart rate was recorded by the Electrocardiogram which were a mean of 80.4±11.6 beats/min. And the younger had a higher heart rate than the older one. Average conduction times in the RP, the QRS complex and the QTc interval recorded 166.7±23.1 msec., 79.7±8.8 msec. and 395.5±30.4 msec., in the P and T wave duration recorded 70.1±13.5 msec. and 97.6±16.9 msec., and in the PR and ST segment duration recorded 97.9±23.5 msec. and 173.9±40.3 msec., respectively. The wave forms in each lead observed various types. The amplitudes of wave type showed the highest frequency in each lead that were analyzed as follow :
1. In P wave, amplitudes of the positive type showed the frequency of 65.3%, 82.7% and 52.0% in leads Ⅰ, II and III that were 103.1±47.8㎶, 115.2±37.3㎶ and 67.4±26.9㎶, and it showed the f requency of 54.1% and 85.7% in the leads aVR and aVF that were 63.7±23.0㎶, 88.0±83.6㎶, respectively. Average amplitude of the negative type showed the (requency of 78.6% in lead aVR which was 99.3±38.0㎶.
2. Average amplitude of the QRS complex were from 362.8±177.7㎶ to 532.8±253.9㎶(mean of 949.1±57.2㎶that in all leads except lead I were manifested the Low-Voltage QRS complex(below 0.5㎷. Average amplitudes of each wave type in the QRS complex aere -50.2.4±258.2㎶ and -428.6±195.1㎶ in the QS groups type that showed a frequency of 66.3%. 70.4% in the leads I and aVL, were 451.1±20.4.0㎶, 387.6±175.8㎶ and 299.3±146.5㎶ in the R groups type that showed a frequency of 48.0% 53.1% and 34.7% in the leads III , aVR and aVF, and were 307.5±180.3㎶, 201.4±77.2㎶ in the QR wave type which showed a frequency of 39.8% in lead II , respectively.
3. In T wave, amplitude of the positive type showed the frequency of 50.0%, 82.7%, 51.0% and 57.1% in leads II, III aVR and aVF which were 214.9±115.6㎶, 1873.5±119.3㎶, 191.0±93.7㎶ and 165.7±91.9㎶, anb the negative type showed a frequecny of 66.3% and 72.5% in leads I and aVL. that were 221.3±112.5㎶, -173.6±86.7㎶, respectively.
4. Amplitude of ST segment in leads I , II and III were a mean of -12.2±37.2㎶, 17.5±42.6㎶ and 28.3±40.4㎶, in leads aVR, aVL and aVF were -3.9±32.5㎶, -15.9±35.6㎶ and 26.2±37.5㎶, respectively.
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