Julio Alvarez, Javier Sarradell, Robert Morrison, Andres Perez

DVM, PhD

Department of Veterinary Population Medicine

College of Veterinary Medicine

University of Minnesota

Impact of PED in growing pigs

PED impact

• Primarily due to losses in suckling piglets– Mortalities between 50-80%b – Time to recover baseline production of

>10 wksc

• Further impact?– Infected growing pigs: 1-3% mortalityb

– Pigs exposed to PED as piglets that make it to the growing phase?

a Swine enteric Coronavirus disease testing summary report, Sept 3 2014b White Paper (Geiger and Connor, 2013)c Swine Health Monitoring Project (Goede and Morrison, 2014)

a

Objective

• To quantify the impact of PEDv infection in growing pigs by comparing– Mortality– Average daily gain (ADG)– Average daily feed intake (ADFI)– Feed conversion rate (FCR)

in batches exposed/unexposed to the virus

Peek at the results

• Impaired performance of pigs from first PED+ batches compared with PED- pigs– Increased mortality (6-18%)–Decreased ADG (0.07-0.26 lb/day)– Increased FCR (0.3-0.8)

Material and methods

• Screening of productive records to select batches from positive flows– Only nursery/WF batches

• Selection of 33 flows– 11 nursery– 22 WF

Commercial sow

Nursery

FinishingWean to

finish

PED detection

• Selection of first PED+ batch within a given flow (“infected” batch)

• Selection of the closest preceding PED- batch from the same flow (“control” batch)– At least 14 days before the infected batch (increase

specificity)– Not more than 4 months before the infected batch

Inclusion criteria

PED+ batch

Control batch (closest available)

Weeks

Data analysis

• Pairs of batches - paired non-parametric comparison (Wilcoxon test) of performance records

• Comparison of nursery to WF paired differences (Mann-Whitney test)

Study population• 18 flows fulfilled the inclusion criteria (18 case + 18

control batches)– 4 nursery– 14 WF (double stocking: first stage in growing, ≈60d)

• Average mortality, ADG, ADFI and FCR in the previous four months (before PED) within normal limits

Descriptive results• First PED+ batch change in trends

– Increase in mortality (4.9 to 15.2%)– Decrease in ADG (0.79 to 0.72)– No change in ADFI– Increase in FCR (1.75 to 2.28)

• GRAFICA GLOBAL

4 3 2 1 PED!

Paired comparison• Mortality

Control Infected

12.5% increase (95% CI: 6.4-18.4)

• Performance

Control Infected Control Infected Control Infected

ADG ADFI

FCR

↓0.16 lb/d↑ 0.55

So, as previously mentioned…

• Impaired performance of pigs from first PED+ batches compared with PED- pigs– Increased mortality (6-18%)–Decreased ADG (0.07-0.26 lb/day)– Increased FCR (0.3-0.8)

Conclusions (II)• Caveats of the study

– Reduced dataset – No adjustment by covariates (site)

• However…– Robust trend suggesting a decreased performance of

growing pigs from PED+ batches• Increase in mortality (6-18%... Or more!)• Decrease in ADG, ADFI unaffected Increase in FCR (0.3-0.8)

– Rough numbers: with 0.3$/lb feed from wean to 40 lbs, 0.55 poorer FCR costs approx $0.16/lb gain

• Impact of PEDv goes beyond suckling piglets

Questions?jalvarez@umn.edu

Thank you very much for your attention

Dr. SarradellDr. Morrison

Dr. Perez