The aim of this study was to evaluate the straw size effect used for freezing on the in vitro fertilizing capacity. Twenty-one ejaculates from seven fertile boars were frozen under controlled conditions in 0.5 and 5 ml straws. Thawed semen was compared to fresh semen. For fresh and thawed semen in 0.5 and 5 ml straws, the results were: 92.18, 77.38 and 79.04% sperm penetration; 80.68, 66.89 and 69.33% monospermy; 11.51, 10.49 and 9.74% polyspermy; 86.19, 47.14 and 47.02% motility and 75.52, 48.19 and 46.81% normal apical ridge (NAR), respectively. Analysis of variance and test of multiple comparisons showed that under the conditions employed, penetration, monospermy, motility and NAR were significantly reduced by freezing-thawing, but polyspermy was much less affected. The results obtained suggest that frozen boar semen is adequate for in vitro fertilization. In addition freezing in 5 ml straws did not have any detrimental effect on either penetration, monospermy, polyspermy, motility and NAR, in comparison with freezing in 0.5 ml straws.