Reprinted in the IVIS website with the permission of
the meeting organizers
Abstract No: O.05-04
COMPARISON OF PERFORMANCES FROM TWO BATCHES
SHOWING DIFFERENT SEROLOGICAL STATUS AGAINST PRRSV AND PCV2 AT FINISHING.
G Ramis, JS Martínez, A Sánchez de la Vega, FJ Pallarés, A Muñoz
University of Murcia, MURCIA, Spain
Introduction
Postweaning multisistemic wasting syndrome (PMWS) is
an emerging disease. It was first described in 1.996 in
Canada, being then describe in most of the industrial pig
production countries. First cases were described in Spain in
1.997 (1).
The aetiology is under debate but nowadays has been
accepted Porcine Circovirus Type 2 (PCV2) as a “need but
not enough cause”, being this syndrome triggered by
immunostimulation. The presence of other viric and
bacterial pathogenic agents can be the source of such
stimulation. Recently, It has been developed a commercial
test to detect IgM and IgG against this virus.
The batch A showed an apparent high health quality at day
1 of finishing, while Batch B had at least 5% hair-roughed
animals. The results form sera analyses are shown in the
following table:
The evolution of weekly and accumulated mortality from
each batch is shown in the figure 1.
14,00
12,00
10,00
8,00
6,00
The aim of this communication is to show performances
and pathological parameters from two batches showing
different seroprevalence against Porcine Reproductive and
Respiratory Syndrome virus (PRRSv) and PCV2 during
finishing.
Materials and Methods
Two batches of finishers (A y B) with 1,513 and 1,605
animals, respectively, from two different origin units
(three-site production system with common nurseries
mixing animals from three farms each) were brought to
two different finishing units. The genetic line, feed and
water source were the same in both batches. Both finishers
were managed by the same farmer and they were placed in
a high porcine density area in SE Spain.
In both finisher, 20 animals (a whole pen) were bleeded at
2nd, 5th and 9th week of finishing. On the sera were
performed a HerdCheck PRRS Virus Antibody Test kit
2XR® (Idexx, USA) and Ingezim Circovirus IgG/IgM
1.1.PCV.K.2® (Ingenasa, Spain) to detect PRRS and
PCV2, respectively. The PCV2 test, is able to detect Ig M
and Ig G against the virus.
Mortality (M), Feed Conversion Rate (FCR), average
Daily Gain (ADG), Medications Cost per pig (MCP),
Finishing length in days (FL) and Mean Finishing Length
(MFL) were recorded for each batch.
Results
Table 1 Serological results from each batch for PRRSv
and PCV2 expressed as percentage of positive animals
Batch A
Batch B
Week 2
5
9
2
5
9
PRRS 10
100
100
90
100
100
PCV2
IgM
10
50
60
90
50
20
IgG
10
30
50
90
100
100
4,00
2,00
0,00
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15 16
17
18 19
20
21
Semanas en cebo
% A
% B
% ACUMULADO A
% ACUMULADO B
Figure 2 Weekly (bars) and accumulated (lines) mortality
during finishing for both batches.
The performances differences were:
M
FC
AD
R
G
% of difference A- -85
+6.
B
2.8
7
MC
P
118
FL
-4.4
MF
L
6.06
Discussion
The comparison of two batches showing different
serological kinetic against PRRS and PCV2 revealed very
important difference in performances. The difference in
mortality during finishing, FCR, ADG and MC; much
lower (Mortality, ADG) or higher (FCR and MC) in those
animals suffering a mixed circulation of PRRS and PCV2
in the first weeks in finishing than those suffering this
infection in nursery, were the most noticeable events
recorded.
The new serological commercial test against PCV2, in
combination with the existing test against PRRS antibodies
allows to determinate the status against PCV2 and help to
predict what level of problem related to can be expected
during finishing by the veterinarian.
Referentes
1. Segalés J et al. (1997) Vet. Rec. 141: 600-601.
Proceedings of the 19th IPVS Congress, Copenhagen, Denmark, 2006 · Volume 1
71