TY - CPAPER AU - Ron Ketchem, BS TI - Historical improvement in sow herd productivity and future trends T2 - AASV Pre-Conference Seminars DP - American Association of Swine Veterinarians DB - AASV Swine Information Library UR - https://www.aasv.org/library/swineinfo/ PY - 2014 DA - 2014/03/01 L1 - https://www.aasv.org/library/swineinfo/Content/AASVPCS/2014/04-029_Ketchem.pdf SE - Swine Reproduction Technology ER -