Meidam
Volante
Vantage
AC1


Abortion in young sows

Introduction

The farm was located in central Portugal. It had 200 sows in production, at 18 kilos.

The case presented in 2008, after the grain price crisis of 2006. In March of 2008 their genetics supplier was changed for a local supplier offering better prices. The farm had been losing money for a long time and had to try and reduce costs, so, after leveraging some payments, the decision to change genetics was made.

The farm presented with a conventional health status; positive for PRRS, M. hyo, S. suis, mange and atrophic rhinitis. The farm also had its own AI center.

The farm̢۪s vaccination plan was as follows:

  • Quarantine:
    • Parvovirus + erysipelas.
    • Aujeszky's disease.
    • Atrophic rhinitis.
    • Live PRRS.
    • Influenza.
  • Gestation:
    • Atrophic rhinitis + colibacillosis.
    • Live Aujeszky's disease every 3 months.
    • Blanket live PRRS in October and November.
  • Lactation:
    • Parvovirus + erysipelas.

The phone call

On June 6, 2008, the farmer called the veterinarian for help. On the phone, the farmer was very upset and expressed that he had a very serious abortion problem. Upon trying to calm him down we realized the scope of the tragedy. We asked him which sows were aborting and he told us the problem was mainly with the first parity sows (we should note that these were the first sows from the new supplier) although he also commented that some second parity sows had aborted as well. When we asked about the percentage of abortions we were even more alarmed; abortions occurred in 90% of first parity sows and in 10% of second parity sows. Given that 90% of the sows aborted in the first farrowing, we deduced that they occurred in a very wide range, between 30 and 109 days. When we asked about the range, our suspicions were confirmed. He sent us the following photos taken with his cell phone.

Abortions halfway through gestation

Abortions halfway through gestation

Pen with sows and their aborted piglets

Pen with sows and their aborted piglets

The photographs corroborated the fact of the matter. At this point we decided to visit the farm.

Farm visit

Due to scheduling conflicts the visit was scheduled on June 30th. At the time of the visit, 80 abortions were counted, and photos were taken that same day of some of the abortions and vaginal discharge.

Abortions at the beginning of gestation (40 days)

Abortions at the beginning of gestation (40 days)

Sow with vaginal discharge

Sow with vaginal discharge

While visiting, we could see that no other stages were affected, nor did we detect any other clinical signs. The farmer confirmed that only some sows had stopped eating, there were no high fevers, only 20% had had a fever at all, the rest had none.

We were looking for an environmental cause that could explain the abortions but found none. The ambient temperature was not too high, there were no excessive drafts and there was no place specific to the abortions. It was noted that the miscarriages had occurred not just in gestation but also in maternity. It was also confirmed that outside of the abortions, there were no other reproductive problems and there was no increase in stillbirths or fertility problems (this remained between 80-85%). The only thing observed, as mentioned before, was vaginal discharge.

Given this scenario, we decided to do serological tests and send some fetuses while watching the feed quality.

Analysis and measures taken

The lab did not find anything relevant pathologically, but upon a feed analysis the presence of mycotoxins was detected, although at tolerable levels. We decided then to undertake the use of adsorbents in the feed.

Analysis Requested: immunological study
Sample Submitted: 44 serum
Species: Swine

PRRS IgGPRRS IgMSIV-AERYPPV
1536-431325531
2629-2643058
3318-31214001
4409-8606301
5452-12944785
6<100-21434526
7270-11191593
81118-41283351
9<100-111284516
10295-91164986
11547-<1364209
12393-91135889
13265-3865531
14<100-7373174
15<100-4754587
16307-<11235170
17<100-22826672
18<100-<11225439
19636-10203555
20<100-5604213
21<100-5535071
22<100-<1563977
23<100-251064792
24442-<1664860
25749-281014955
26275-85183405
27508-62722840
28422-75662649
29<100-8578 4260
30<100-7981 4533
31<100-3712271
32386-31552799
33879-82262335
34<100-71902594
35<100-82723875
36394-171263937
37403-331354761
38<100-61333446
39<100-61372669
40<100-<11322421
41<100-38152581
42<100-66784597
43592-<11185684
44<100-791255422

Analysis requested: Infectious abortion syndrome
Species: Swine

Bacteriological Study. Tecnique: culture
Screening forApplicationResults
Erysipelothrix rhusiopathiae Yes Negative
Brucella spp. Yes Negative
Salmonella spp. Yes Negative
Listeria monocitógenes Yes Negative
Fungi Yes Negative
Antigen detection
Screening forTecniqueApplicationResults
Aujeszky Virus PCR gE No -
PCR gB No -
FA No -
PRRS RT-PCR EU/USA No -
Influenza A virus PCR No -
Leptospira LIPL-32 PCR No -
Chlamydia FA No -
ELISA Yes Negative
Parvovirus FA No -
ELISA No -
PCR No -

New analyses and diagnostic

Unfortunately, the abortions continued and in December of that year we made another visit in which we were unable to detect anything new. At this point we decided to perform new serological exams and fetal monitoring, but this time we added a hemographic profile of 18 sows.

ParametrerUnitSowNormal
1 2 3 4 56789
Erythrocytes106/μl7,337,136,675,866,586,326,556,347,615,1 – 8,0
Hemoglobing/dL13,014,613,111,513,112,813,512,113,510 - 17
Hematocrit%39,242,3 Video