The aim of this study was to determinate the heart ventricle volumes of Kivircik sheep and Hair goats by using a stereologic method. From thirty Kivircik sheeps (15 males and 15 females) and thirty Hair goats (15 males and 15 females) total sixty hearts were used. After weighing and recording the hearts, the volumes of ventricles and their sections (right ventricle's side wall, left ventricle's side wall, right ventricle cavity, left ventricle cavity, and interventricular septum) were calculated by Cavalieri principle. At the end of the calculations considering sex differentiations, corelation analysis of all the data were done by using the carcas, heart and ventriculi weights and the mean heart volumes. At the species comparison of Kivircik sheep and Hair goats with and without sex variations, differences at p<0,01- p<0,001 levels were determined between the mean volumes without taking the sex variation into account, a p<0,01 level difference was observed in right ventricle volume and a p<0,001 difference in the other characteristics examined. At evalutions by considering the sex variations, there was a p<0,01 level difference between the mean values of right ventricle of (Rams) and bucks. In sheep and goats the right ventricle volume had no importance however, heart weight had a p<0,01 level significance.