There were no interactions between the effects of treatments and parity on litter birth weight, litter wean weight, daily litter weight gain, and daily pig weight gain. Days return-to-estrus was similar (p = 0.325) between the treatments and between the parities. Conception rate at d 35 post-breeding for the subsequent parity was similar between the treatments (93.4% and 91.0% for CON and YC, respectively).