A study on the performance of pigs at the Pig Unit, Universiti Pertanian Malaysia, was made. The birth weight per pigling of Landrace-Duroc crossbreds was significantly higher (P<0.01) than the mean of the parental breeds in the first and second farrowing. The crossbreds also showed general improvement in litter size at birth, litter size at weaning, weaning weight, age at first estrus and age at first farrowing. The only exception was the weaning weight at second farrowing in the crossbreds where their performance was lower than the purebreds. This could be attributed to a change of feed. Repeatability estimates of 0.1461 and 0.2416 for litter size at birth in Landrace and Duroc were obtained.