Factors Associated with Farrowing Failure Occurrences in Reserviced Females on Commercial Swine Farms

Abstract

Of collected 687 U.S.A. farms, 149 farms were selected by the criteria based on accurate 5-year records. Farrowing failure occurrence (%) was defined as the number of females returned to service and failed to farrow divided by the number of females served during a certain period. A service was defined as one or more mating events during a 10-day time period. Of 178, 367 services in 155, 035 parity records of 39, 945 breeding females, 39, 204 females (22.0%) had farrowing failure occurrences in the first service, 23, 332 females (13.1%) were rserviced. Farrowing failure occurrences (%) in the second, and third service or later were also 32.4, and 49.2%, respectively. Using the multiple logistic regression analyses in mixed models of SAS, increased numbers of services were associated with higher farrowing failure occurrences (P 14 days (P<0.05) . In the first service and reservice groups, females serviced from April to September had higher farrowing failure occurrences than those serviced from October to March (P<0.05) . Low or high parity females rserviced during spring and summer seasons after short lactation length should be carefully monitored on commercial farms.