Correlation of Gestational Sac Diameter, Fetal Heart Diameter, and Fetal Head Diameter to Gestational Age of Local Cats (Felis domesticus) Pregnancy in Indonesia

Fetal development in domestic cat can be monitored using ultrasonography to control viability, maintain the nutrition care, and drug use. Due to control the viability of foetuses, this study observed the correlation of gestational sac diameter, fetal head diameter, and fetal heart diameter compared to gestational age. This study was performed by using 9 queens that divided into three groups. The first group measured the gestational sac diameter, the second group measured the fetal head diameter, and the third group measured the fetal heart diameter. Gestational sac diameter and fetal head diameter are measured by specific formula, while the fetal heart diameter calculated by measuring point to point of heart edge and compare to head diameter to verify the gestational age. As the result, the gestational sac diameter, the feal head diameter, and the fetal heart rate of domestic cat in Indonesia have correlation to gestational age and also can be used to estimate the gestational edge.