Dr. Tao Feng focuses on improving reproductive performance in sows by increasing litter size and birth weight and decreasing the coefficient of variation of birth weight. He found that several nutrients had potential effects on increasing litter size and decreasing the coefficient of variation of birth weight in sows. Fixed-time artificial insemination (FTAI) is a new reproductive technology to increase the productive efficiency of pig farm management; exogenous hormones can stimulate follicular development and induce ovulation in these sows but do not change the litter sizes of replacement gilts and multiparous sows. Whether nutrients can improve reproductive performance in the sows subjected to FTAI is still unknown.