Sow productivity is a major objective for genetic improvement of pigs. Research in Europe and the USA has indicated the greater reproductive rate, but lower growth rate and leanness of several Chinese genotypes, including Meishan (Haley, Lee and Ritchie 1995, Young 1998). To better assess the potential of Meishan genes Cotswold has developed a ½ Meishan ½ Landrace synthetic female grandparent line selected for leanness and litter size for seven generations. To determine whether selection in this line has exploited the advantages of Meishan whilst limiting the disadvantages the genetic gains in growth and reproductive performance were estimated. Also progeny of a ¼ Meishan crossbred parent gilt (½ Meishan × Large White) were compared to European type crossbred pigs containing no Meishan genes.