Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche
Webzine Sanità Pubblica Veterinaria: Numero 49, Agosto 2008 [http://www.spvet.it/] ISSN 1592-1581
Documento reperibile all'indirizzo: http://www.spvet.it/arretrati/numero-49/004.html
Adaptation ability of natural immune system in cinta senese swine and
commercial hybrid breeding pigs to outdoor farms
Battistacci L., Sensi M., Timi M., Marchi S., Moscati L.
Evaluation of welfare in breeding animals is one of the main topic of both the European and national legislation. Whenever a stress status becomes chronic, all the non
adaptive immune system is involved, thus resulting in evident conditioned pathologies.
This innate part of the immune system is easily influenced from environmental stress. In this work we monitored in an intensive breeding herd on outdoor growing and
finishing, and in an outdoor pig farm to evaluate whether and to what extent the breeding system may affect the non adaptive immune system.
Materials and Methods
The study was conducted on three different breeding herds:
An outdoor Cinta Senese farm.
The herd, located on an hill area, had a population of twenty productive sows. The sows
were kept in separate indoor pens inside a hut with a large veranda. The piglets, weaned at nearly thirty five days of age,
were moved to a separate one acre paddock.
Traditional indoor pig farm with 200 on production sows. Pregnant sows were reared in small group pens or in individual
cages. The building was naturally ventilated without any heating system. The farrowing houses had traditional raising farrowing pens with steel slatted floor.
Traditional intensive indoor pig farm. The herd was composed of hybrid commercial sows, producing self replacement gilts. The
farm was organized on a multi-sites basis (three sites production: breeding herd, nursery and fattening unit). The
fattening unit had rooms dimensioned on the pig number receiving each week to adopt all in / all out policy, allowing
washing and disinfection procedures.
Each pen had complete slatted floor and internal temperature was properly maintained
by a suitable heating system. A forced ventilation system was installed.
Sampling. A total of ninety blood samples, thirty for each breeding were collected.
Serum lysozyme, serum bactericidal activity, haemolytic complement activity were investigated Lysozyme determination leads to monitor the functionality of the macrophages haematophage system and it is indicative of ongoing inflammation.
Its concentration value was expressed in µg/ml. Serum bactericidial activity is a major parameter for evaluating the activity of the non-specific immune system The haemolytic complement assay provides indications on the defence mechanisms of
the animal that contemplate activation of the complement system.
Its concentration is expressed as CH50.
Results and discussion
Serological test results are summarized in
table 1. Significant differences on serum
bactericidal activity and total serum
lysozyme values between classic indoor
versus outdoor pig farm were recorded,
while statistical differences between the
two outdoor farms were not seen.
The parameter values obtained differ
mainly for serum bactericidal
activity (> 40 %);.
This result could be due
to a different environmental condition in the
Table 1: Non-specific immunity parameters comparison between the breeding herds
monitored (avgs ±SD)
Serum bactericidal activity values recorded in both outdoor farms are lower then traditional
indoor farm (natural antibodies levels decreasing).
At the same time total serum lysozyme levels
are increased although still within the normal range. This fact could be due mainly to a
granulocytic de-granulation rather then an increased activation of monocitary – macrophagic
The use of non-specific immune parameters could be useful to have information on the animal
capacity to adapt to the living environment. This capacity could be influenced also by the genetic
patrimony. Further investigation on the different environmental conditions might highlight which
breeds are more suitable for the different breeding typologies.