Smallholder farmers preferred to raise native swine despite its size when compared  with commercial breeds, The IGF system is responsible for the growth of human and animals. Insulin-like growth factor 1 receptor (IGF1R) is said to be one of the candidate genes for growth since it regulates the functions of IGF1 and IGF2. Intron 9 and Exon 10 were amplified using DNA from thirty ear notch tissue samples in four native pig breeds for sequencing. The sequences were analyzed and the gene and genotypic frequencies were calculated per size and per breed. Eastern Samar was observed to have a predominant T allele at position g.145 with a frequency of 71.43%. Fisher’s Test was performed, and gene frequency of T and C differs between breeds (p-value = 0.0121) at position g.145. No significant differences between size groupings were observed.