The effects of yoghurt supplement on growth performance and the reduction of diarrhea problem in suckling pigs were studied. Sixty-five piglets were randomly divided into 5 groups, each comprised of 13 piglets. Group 1 served as the control (received no yoghurt). Group 2, piglets were supplemented with commercial plain yoghurt from 5-12 days of age. Group 3, piglets were supplemented with home-made yoghurt, produced from commercial yoghurt, during 5-12 days of age. Group 4, piglets were supplemented with commercial plain yoghurt during 5-21 days of age. Group 5, piglets were supplemented with home-made yoghurt, produced from commercial yoghurt during 5-21 days of age. Yoghurt was given orally twice a day, in an amount of 10 ml/piglet, from 5 to 12 days of age. For the piglets in group 4 and 5, yoghurt was given in an additional amount of 15 ml/piglet from day 13 until weaning at 21 days of age. The average daily weight gain (ADG), health condition and incidence of diarrhea in the piglets from 5 to 28 days of agewere recorded. The results revealed that ADG in group 1 was significantly lower than those of the other groups (P<0.01).The average daily gain until 28 days of age in group 4 and 5 which got long term supplement tended to be better than those of group 2 and 3 which got short term supplement (P>0.05). The percentage of diarrheic piglets in group 2-5 were significantly lower than that of group 1 (P<0.05) and the percentage of recurring diarrheic piglets after recovery in the control group (group 1) was significantly higher than those of groups 2-5 (yoghurt groups) (P<0.05). In addition, it was found that home-made yoghurt had good effect similar to commercial yoghurt.