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Summary
Background and Objectives: Many commercial swine farms cannot implement
all-in-all-out (AIAO) because of different capacities of farrowing, nursery and finishing units.
However, breaking the infection cycle is essential in disease eradications, thus creation of
a sustainable batch management system (BMS) gives an opportunity to implement AIAO.
This study surveyed production impact of a 3 weeks BMS implementation as an element
of a PRRS Eradication Plan (PEP).
Materials and Methods: The farrow-to-finish Topigs genetics swine farm had 800 sows
and their progeny. The farm was obliged to set up PEP following initiation of a mandatory
national PRRS eradication program. Due to the different capacities of consecutive farm
production units, a 3 weeks BMS was launched with oestrus synchronization for grouping
sows starting in August 2015. The farm production indices were surveyed from August 2014
to July 2016 (one year before and after BMS launch) to measure its impact. The data were
processed with Microsoft Excel© program.
Results: After launching BMS monthly farrowing (F) decreased by 10%, artificial insemina tion (AI) by 11%, but AI/F increased by 2% with an extra 0.4 live piglets/litter. Although litters/
sow/year and weaned piglets/sow/year indices slightly decreased, the number of slaughter
pigs/sow/year increased by 1.37. Mortality and culling rate were improved; in the farrowing
unit the combined index decreased from 9.6% to 6.5%; in the nursery from 6.9% to 1.6%,
and for finishers from 10.5% to 7.5%. Feed conversion ratio has improved in the nursery
from 2.27 to 2.17 and for finishers from 4.33 to 3.88. Total drug cost per slaughter pig decrea sed by 23.8% (form €12.4 to €9.5), of which antibiotics by 38.4% and vaccination by 22.0%,
contrary to an increased cost of disinfections by 150.9%.
Discussion and Conclusions: The results support that a 3 weeks BMS as element of
PEP is an inevitable tool for the implementation of AIAO. BMS helps to break the PRRSV
infection cycle, thus, accelerates PRRS eradication and improves swine production indices.
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