Study of dietary chromium yeast supplementation on reproductive performance in crossbred Landrace x Large White replacement gilts in 1,500 sows commercial herd. The sows were randomly devided into 2 groups ; control group was received normal diet and treatment group was received chromium supplemental diet. Chromium yeast was added at 200 ppb in the treatment group's diet started from 6 kilograms weight to the end of the study period (sows had already weaned the second litters). This study investigated the reproductive performance of control sows in the first two litters. The number of total born piglets at the first parity in the treatment group was higher than the control group (9.94+-2.24 piglets and 9.50+-2.52 piglets respectively (+0.44) p>0.05). The number of piglets born alive in the treatment group was higher than the control group (9.30+-2.46 piglets and 8.70+-2.79 piglets respectively (+0.60) p>0.05). The wean to service interval in the treatment group 1.54 days shorter than the control group. Thenumber of total born piglets in the second parity in the treatment group was higher than the control group. (9.95+-2.71 piglets and 9.61+-2.21 piglets respectively (+0.15) p>0.05). The wean to service interval in treatment group was 1.41 days shorter than the control group. This study showed that chromium yeast supplementation can improve the reproductive performance in parity 1th and 2nd but not significantly.
