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Control of swine food chain for decreasing salmonella prevalence

The present project is focused on the development of a new automatic system to incorporate additives (new antibiotic and other additives) to animal feedingstuffs, to control salmonella.

Usually, the antimicrobial and antifungal products are incorporated into the feed during the dosage phase, so the additives are homogeneously mixed with other raw materials and after they have to continue the normal granulation processes, carrying an associated heat treatment, air cooling, and so on, that may reduce the efficacy of the added product (antimicrobial), produce evaporation losses and generate the emergence of subsequent contamination in the feed. The project was born of the approach to develop a new automatic system of additives (antibiotic and other additives) incorporation to animal feeding-stuffs at the end of the process of production of feeding-stuffs. Thus, the system will guarantee the quality and security in the feed production process and will permit the control of several micro-organisms incidence in pigs (specially Salmonella), preventing Salmonella passage to human food chain. The control of the incidence of the Salmonella in pig is a subject of an increasing interest, mainly by the preoccupation of the consumers in food security provoked by the recent crises. For that reason, the study of measures to prevent the contamination by Salmonella in pigs is increasing in Europe. This contamination is produced to a great extent by the consumption of animal feeding-stuffs infected by the microorganism. The study of measures of control of the presence and control of Salmonella in animal feeding-stuffs should be made in association with handling procedures in farms to avoid the recontaminations and crossed contamination. Therefore, the project is going to study the addition of an antimicrobial (for the control of Salmonella) at the end of the feed production line. In this way, once the additive is mixed with the feed the final product is obtained without any new treatment except the storage. This fact will require a complete study and several adjustments of the antimicrobial dose which is necessary to exercise the same effect on feed. The project also includes a subsequent monitorisation of the feed to study the effect of the treated feed (feed + antimicrobial) on the incidence of Salmonella in animals (pigs). Therefore, the project will require the implementation of the following tests: - Simulation laboratorial tests to assess the potential effectiveness of antimicrobial losses during processing of the feed mainly due to the thermal treatment associated with granulation process as well as potential interactions (positive and negative) with other antibiotics or additives, which are also included in the same moment. This will provide for the addition of new requirements in the new system and the best presentation (powder or liquid). - Analytical on raw materials and feed without antimicrobial to isolate and identify the strains of Salmonella present (because it determines resistance or sensitivity to treatments). - Analytical on feed made with the new production system, in order to: 1. To verify the dose of antimicrobial in the feed when it arrives to the farm (to consider if one part is lost by evaporation during storage and transportation). 2. To check the hygienic quality of the feed (antimicrobial effectiveness to get a feed Salmonella free). - Analytical on animals to determine the initial levels of Salmonella and assesses the effectiveness of feed with antimicrobial to control Salmonella prevalence. Obviously, to avoid continuous recontaminations these experiments must be carried out on a farm that has a comprehensive management control and that has introduced a series of Biosecurity measures to limit the external and uncontrolled infection risks. The development of the project will suppose a change in the traditional system of feeding-stuffs production, since it is going to be made a control throughout all the processes of production until the storage of the formulas and after the verification of the hygienic and qualitative quality of the end item, is going to be made the automatic addition from additives and antibiotics for the control of the incidence of the salmonellas in the pig species. The system will allow incorporating a series of additives, enzymes, acids, oils and antibiotics at the end of the animal feeding-stuffs production process in conditions of maxima security, hygiene and control. These additives are added in small doses to fit formulations to the requirements and concrete exigencies of the clients according to the scope animal requirements depending on age, productive state, etc. and to the legal exigencies. Between the technological objectives it emphasises the development of a new protocol of animal feeding-stuffs manufacture that includes the addition of an anti-salmonella compound at the end of the production process, when the product is arranged to leave the factory towards the farm. Thus, the dose of additives will be reduced, and it will be allowed making formulations specially adapted to the concrete exigencies of the clients. The main impact of the project in the animal sector is to be able to guarantee the traceability of foods consumed by the animals, guaranteeing that its composition when coming out of the factory contains additives enough to the incidence of the Salmonella in the feeding of the pig, but diminishing to the maximum the doses of these additives, because when taking place the addition on order, the doses can be adapted to the necessities of the clients. The dwell time of the feeding with additives in the factory decreases and the possibility of crossed contaminations is eliminated. On the other hand, the dose of additive-antibiotics is fit because they will be added once the hygienic quality (specially presence of Salmonella) has been verified in each animal feeding-stuffs lot. This project will be of great impact in the pig farms, since it has been demonstrated that when the levels of Salmonella stay below a certain limit its incidence does not have substantial effects on the pig production and the quality of the obtained end item. That is why the project will allow firstly improving the productivity of pig farms (when reducing the productive losses due to sublicical Salmonelosis) and secondly obtaining and end item of better quality (with a reduction of the risk of passage of Salmonella to the carcase). Keywords: anti-salmonelosic, swine, animal feeding.
Acronym: 
PRESALOW
Project ID: 
4 187
Start date: 
01-06-2007
Project Duration: 
31months
Project costs: 
2 200 000.00€
Technological Area: 
Food Technology
Market Area: 
Health food

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