Swine Production Infection Chain - Dr. David Baumert, Swine Practitioner, from the 2013 World Pork Expo, June 5 - 7, 2013, Des Moines, IA, USA. More presentations at http://www.swinecast.com/2013-world-pork-expo

1. David A. Baumert, DVM
World Pork Expo, Des Moines, Iowa
June 6, 2013

2.  Description: The movement of infectious
disease agents from breeding herds to the
offspring production flows (with resulting
production losses up to and including the
market swine phase).

3.  Respiratory:
◦ Mycoplasma hyopneumonia (Mhp)
◦ Influenza virus
 Enteric:
◦ Lawsonia (ileitis)
◦ Brachyspira spp. (Swine Dysentery)
 Systemic
◦ Porcine Reproductive & Respiratory Syndrome Virus
(PRRS)

4.  Agent: Mycoplasma hyopneumonia (Mhp)
 Case sow herd:
◦ Considered Mhp-positive, yet stable;
◦ Occasional Mhp laboratory diagnosis in absence of
clinical disease;
 Replacement gilt flow:
◦ Previously Mhp-negative;
◦ Diagnosed with acute, clinical Mhp
 Management decision: Utilize gilt flow rather
than try to find another suitable, temporary
genetic/health fit

5.  February 2010: Recently Mhp-infected gilts
moved into commercial sow herds;
 Spring/Summer 2010: Sow herds showed
evidence of respiratory disease instability;
 August 2010: Clinical disease, laboratory
diagnosis, and frequency of treatments
increased in subsequent nursery and on to
late finisher flows as pigs matured;

6.  Retrospective review of diagnostic case
reports correlated with closeout production
and performance data from 2007-2011;
 Compared ‘positive disease diagnosis’
finisher groups to baseline (finisher groups
not having a specific laboratory diagnosis for
the diseases of interest);
 Examined Mhp, Influenza virus, and PRRSv;
 Special credit to Cara Dykhuis Haden (2011);

7. 70
114
151
22 24
16
8
0
20
40
60
80
100
120
140
160
1
Number of Cases
Case Summary 2007-2010
M. Hyo PRRS SIV M. Hyo & SIV M. Hyo & PRRS SIV & PRRS M. Hyo, PRRS & SIV

8. 2.11%
1.57%
1.87%
2.80%
6.00%
4.46%
3.93%
0.00%
1.00%
2.00%
3.00%
4.00%
5.00%
6.00%
7.00%
M. Hyo PRRS SIV M. Hyo & SIV M. Hyo &
PRRS
SIV & PRRS M. Hyo, PRRS
& SIV
Increase in Mortality
(% mortality
above Baseline)
Increase in % Mortality, Culls & Tail-enders

9. Disease Loss per pig
(compared to
baseline)
Loss per 2400 head
barn
Mhp -$2.52 -$6,037
PRRS -$6.59 -$15,822
Influenza -$7.31 -$17,551
Mhp & Influenza -$4.21 -$10,095
Mhp & PRRS -$16.31 -$39,135
Influenza & PRRS -$17.08 -$40,981
Influenza & PRRS &
Mhp
-$14.52 -$34,858

10.  Sow herd disease, including gilt source disease,
can become finisher flow disease;
 Single-agent infection chain diseases can result
in $2.50 to >$7.00/head economic loss;
 Multi-agent infection chain disease can results in
$14.40 to >$17.00/head economic loss;
 Control of ‘Infection Chain Disease’ at the gilt
source level can control significant economic loss
throughout the production chain;

11.  Questions?