In the current study, allele frequencies of the SNP IGF-1/SnaBI estimated for the UHFxNZHF group (A: 0.52, B: 0.48) as well as for the total sample (A: 0.59, B: 0.41), are in agreement with those previously published in North American (NA) [24], Polish [25], and Uruguayan [29] HF populations (A: 0.55, 0.52 and 0.60; B: 0.45, 0.48 and 0.40, respectively). This evidence concerns the gene IGF1 and hydrops fetalis.