TY - JOUR AU - Lewis, CRG AU - Torremorell, M AU - Bishop, SC TI - Effects of porcine reproductive and respiratory syndrome virus infection on the performance of commercial sows and gilts of different parities and genetic lines T2 - Journal of Swine Health and Production JF - Journal of Swine Health and Production J2 - JSHAP SN - 1537-209X DP - American Association of Swine Veterinarians PB - American Association of Swine Veterinarians DA - 2009/May// PY - 2009 VL - 17 M1 - 3 IS - 3 M2 - 140 SP - 140-147 L2 - https://www.aasv.org/shap/issues/v17n3/v17n3p140.html UR - https://www.aasv.org/shap/abstracts/abstract.php?v17n3p140 L1 - https://www.aasv.org/shap/issues/v17n3/v17n3p140.pdf KW - swine KW - porcine reproductive and respiratory syndrome KW - parity KW - breed KW - PRRS N2 - Objectives: To examine the parity and genetic-line differencesand trends for major sow reproductive traits during an outbreak ofporcine reproductive and respiratory syndrome (PRRS) and todetermine whether specific parities or genetic lines are moreseverely affected by PRRS virus.Materials and methods: Reproductive performance data (gestation length, total piglets in utero, total piglets born alive, total piglets born dead, total mummified piglets born, total stillborn, and total weaned) were obtained from a commercial herd in China (8098 litters from 1820 sows) from differing genetic lines (Landrace, Large White, Pietrain, Meishan, Duroc composite, and various crosses). The dataset was partitioned into a baseline and a disease phase. Statistical analysis compared performance differences between these two phases for sows of different parities and lines.Results: PRRS caused significant production losses, impacting most reproductive traits. However, the impacts were greater in early parities, eg, the numbers of mummified piglets per litter were greater for sows of lower parities (1 through 5) than older sows (parities 6 through 11), for which there were no differences between disease and baseline data. Line differences and interactions were also detected, highlighting a greater impact of PRRS virus on the Meishan line than on their European counterparts.Implications: Parity should be considered when examining host genetic resistance to PRRS virus and when designing management strategies. The Meishan line may be more susceptible to reproductive PRRS. The use of the Meishan-type line to impact fecundity traits in a disease situation should be reconsidered. ER -