Abstract
Sequential electrocardiograms were taken of 50 pigs (25 Iberica and 25 Duroc), from the ages of 5 days to 205 days. The records were analysed to establish the normal values of the different electrocardiographic intervals (RR, QRS, QT, TQ and ST intervals), the diastole/systole quotient and heart score in the first 7 months of life, as well as age-related electrocardiographic variations. In addition, it was intended to determine which of these two breeds showed the greater heart recovery capacity. Finally, positive or negative correlations between the RR interval and the electrocardiographic incidents studied were analysed. The mean values obtained for the electrocardiographic parameters were similar in the two breeds and increased with their physical maturity. Analysis of the correlation between the duration of the heart cycle and the different electrocardiographic incidents showed a positive and significant correlation, the r-values being higher for the RR interval-TQ interval correlation. There was very little correlation between RR interval and heart score in Duroc pigs and practically no correlation between the RR interval and the QRS interval in either breed.
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