Common Diseases in Broiler
The life cycle of the broiler bird is very small. Normally marketable age broiler is 30 days. But some countries have been permitted for 45 days. the most common diseases of broiler are omphalitis, coccidiosis, Gout, Mycoplasmosis, Salmonellosis.
Salmonellosis is the foremost disease in broiler birds. It is intracellular & gram-negative bacteria. It is impossible to eliminate from the flock due to intracellular nature.
There are two types of diseases found in the broiler. Pullorum disease & fowl typhoid the most common in the broiler. Source of infection involving by contaminating eggs, water, and infected birds.
It is caused by Salmonella pullorum and the most devastating disease for broiler chicks.
Primary clinical signs involved pesty vent with yolk color feces as well as whitish, dullness at standing position.
Predominated gross findings are yolk mass found in the abdominal cavity and the liver became small with yolk color.
It is caused by Salmonella gallinerum and the most devastating disease for broiler chicks
General clinical signs are chicks quietly underweight, hurdling, prostration, dullness, feed dejection, etc.
Yolk sac turns larger than normal. The liver became enlarge, congestion, and in severe cases, it turns a greenish color.
Sulphanomide, tetracycline, broad-spectrum penicillin are totally resistance to Salmanelllsis. Aminoglycosides as gentamicin, amikacin, Neomycin, are effective in salmonellosis in the broiler.
Cephalosporins 1st- 3rd generation- cefradine, ceftriaxone, ceftiofur @ 10mg/ kg bodyweight successfully control salmonella infection in oral & parenteral route.
Chronic Respiratory Disease (CRD)
It is the most common disease in the broiler. It is caused by Mycoplasma gallisepticum which is gram-negative bacteria. Having a distinct cell wall, very few antibiotic responses to suppress the Mycoplasma gallisepticum.
CRD is seen in every weather condition but it is turned to severe in the winter season. colder climate stimulates to inside CRD in the broiler.
There are two types of clinical signs are observed in the broiler,
Primarily, hacking cough listens without interruption feeding & watering. Mycoplasma gallisepticum is only responsible for this clinical sings. There is no mortality occurred
Secondly, hacking cough with a reduction of feed & water, that might be Mycoplasma complicated with others gram-positive & gram-negative organisms.
This types of infection called Complicated chronic Respiratory disease (CCRD)Mortality reach to 50% in complicated with bacteria, virus & fungal infection
When Mycoplasma gallisepticum is responsible for hacking cough, air sac mildly dilated and drop y bubble in the air sac.
Besides, air sac became congested, thickened, fibripurulant, yellowish plaque is seen in Complicated Chronic Respiratory infection.
If the feeding & watering are normal, Just apply antimycoplasmal drugs like Tilmycosin, Erythromycin, Tylosin at recommended dosages with a gram-negative spectrum like florfenicol, neomycin sulfate, colistin sulfate at the oral route.
On the other hand, if the starting mortality rate increased mentioned drugs applied in both routes successfully control the infection in the broiler.
Tiamulin hydrogen fumarate is also effective at CRD in the broiler. But, It is risky due to some coccidiostat using in broiler feed that causes an adverse toxic reaction. Thus causes severe paralysis and sometimes leading to mortality.
That is why, if it needs to use tiamulin in the broiler, please confirm which types of coccidiostat in broiler feed.