RETURN TO ESTRUS AND RE-SERVICE PROFILE IN SOWS FROM A PIGLET-PRODUCING UNIT: A RETROSPECTIVE ANALYSIS

Abstract

Reproductive efficiency is essential to productivity in swine production, and monitoring reproductive indicators is important for identifying changes within the herd. This study aimed to describe return to estrus and the profile of re-services in sows from a piglet-producing unit. A retrospective analysis of reproductive records was conducted at a unit with approximately 650 sows, located in Cascavel, Paraná, Brazil. Data were obtained from the Agriness S4 management system for the period from January to June 2026. Return-to-estrus and farrowing rates, intervals between services, causes of re-service, and parity of re-serviced sows were evaluated. The overall return-to-estrus rate was 10.83%, while the overall farrowing rate was 84.11%. A total of 73 re-services were recorded, most frequently within the 18-to-24-day interval (31.51%), with return to estrus predominating among the recorded causes (89.04%). The results demonstrated variations in reproductive indicators and enabled characterization of the re-service profile, without establishing causal relationships between the observed events.