The aim of the study was to evaluate the number of teats of performance tested pigs consisting of 1663 boars and 4125 gilts of Landrace (LDR) and Large White (LRW), and their F₁ crosses.  Breeds standards of teat number (left teats, right teats, and total teats) were 6.72+0.54 teats, 6.70+0.55 teats, and 13.42+0.88 teats, respectively in LDR, LRW, F1 (50%LDR x 50%LRW), and R1 (50%LRW x 50%LDR).  Purebred Landrace pigs had more left, right, total number of teats (6.71+0.01 teats, 6.73+0.01 teats, 13.15+0.21 teats) compared to Large White pigs (6.70+0.01 teats, 6.64+0.01 teats, 13.44+0.02 teats).  The number of right teats and total teats were significantly different between breeds but not in the number of left teats.  Only body length was positively correlated with the number of teats. Sex and performance test traits (i.e. average daily gain, feed efficiency, and backfat thickness) were not significantly related to the number of teats. Crossbred pigs (13.59 teats) had more teats compared to purebred pigs (13.30 teats). Heterosis was highest in total number of teats (H_TT=2.22% or +0.30 teats), followed by number of left teats (H_lt=1.04% or +0.07 teats), and least in number of right teats (H_RT=0.45% or +0.03 teats).  The R1 pigs with a Landrace dam (14.07 teats) had more teats than F1 pigs with a Large White dam (13.11 teats).