Abstract: The pre-wean growth is a complex trait that gauges the success or failure of the succeeding post-wean growth until a final product is produced. This study evaluates the variance components to identify the critical source of variance in pre-wean growth traits of Marinduke pig, the indigenous pig in the island province of Marinduque, Philippines. The pre-wean growth as measured on birth weight (BW0), weaning weight at 49 day-old (BW49), weight gain (BWG), and average daily gain (ADG) were evaluated from 62 piglets. The mean and variability e.g. standard deviation and coefficient of variation, correlation and regression, analysis of variance, and variance partitioning were instituted. Result shows that the pre-wean growth trait specifically the BW0 was dependent on the maternal effect (37.74%) or the influence of the dam’s phenotype on the phenotype of her progeny. The BW49 (42.20%), BWG (46.23%) and ADG (47.58%) were found due to the effect of litter size. A management protocol that shall provide better nutrition and welfare is required to sustain the physiological requirements thereby ensuring better and uniform pre-wean growth in Marinduke pig.