During their various stages of production, the poultry undergo multiple stress affecting their behavior and their immune system with direct impacts on their digestive or respiratory balance.

Since the hatching, the digestive flora settles down gradually, with the implantation of various bacterial populations. After about 20 days, the gut flora becomes mature with a stable balance, but this remains fragile and is continually disturbed (dietary changes, difficult farming conditions, decreases consumption, immune deficiencies ...).


After 21 days on a mature gut flora, the risk of enteritis becomes important on broilers (from bacterial origin). The impact on feces quality is immediate: they become rich in water and pasty. If nothing is set up, the risk may get worse and lead to severe intestinal inflammation and mortality.

The instabilities of the gut flora are convenient to coccidiosis, linked to the presence of Eimeria parasites. Present in the environment, coccidia multiply in intestinal cells with considerable physiological and economic consequences. The related disorders usually occur on young chickens and pullets, as well as during transitions.

The long-cycle productions (laying hens, turkeys, labels) and free range may also be affected by intestinal parasites. Their spoiling action may results in in vitamins, trace elements and amino acids deficiencies. In case of strong development, diarrhea can be accompanied by intestinal obstruction, with a direct impact on zootechnical performance (ADG, FCR).

Many other parasitic diseases lead to specific illness, with sometimes physiological and economic consequences such as trichomonia, or histomonia (also called "black head") often found in turkeys, guinea fowls or game birds. Some digestive pathogens (as salmonella or campylobacter) may cause food poisoning in humans. A control of contamination is recommended to ensure the safety of food.


The respiratory disorders of bacterial or viral origin are enhanced by the presence of dust and ammonia degrading the conditions of rearing.
In poultry the secondary infections bound with colibacillosis strongly affect respiratory function with strong economic consequences: mortalities, decreases in performance and seizures at the slaughterhouse.


In order to optimize the expression of the genetic potential and the zootechnical performances of poultry, the strengthening of the immune defenses helps it possible to secure the start-up period. The oxidative stress caused by breeding conditions or other external factors degrades the immune response and performances (FCR).

In laying hens or breeding poultry, the metabolism activity is highly mobilized the export of eggs. The hepatobiliary sphere has a predominant role in the absorption and transformation of nutrients. Its protection ensures performances throughout the entire production cycle.


Nervous disorders (overcrowding in the building, interactions between poultry, sexual behavior, sanitary problems, food problems, temperature variations) cause a drop in zootechnical performances, but also loss of the economic value of the animal due to abnormal behaviors (mortality or aftereffects as a result of scratches, pecking, aggressiveness, fights).