RESUMEN
The increasing processes of body and heart weight, the index changes of heart to body weight rat and of heart walls thickness [ventricular and inter ventricular] were studied on 160 goat fetus [2groups male and female] from 7 to 22 week ages [at the first to the end of fetal period]. Data analys in SPSS and by ANOVAshowed that the influence of age in all of 6 studied parameters was signifie [p < 0.01].conclusion: The increasing process of heart weight is followed by ageing and by Bod weight. The index of heart to body weight ratio decreases while the body weight increases. The Averag of maximum thickness of left ventricle wall is more than, interventricular [septum] and of this is mo than of right, frequently. The increasing processes of thickness for left ventricle and septum are simila while the right has an independence model