Diseases in Broiler

Diseases Of Broiler and Treatment | part 02

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Common Diseases in Broiler

The life cycle of the broiler bird is very small. Normally the marketable age broiler is 30 days. But some countries have been permitted for 45 days. this type of disease affects broiler birds. the most common diseases of broiler are

  • Omphalitis
  • Coccidiosis
  • Gout
  • Mycoplasmosis
  • Salmonellosis
  • Newcast;e Disease
  • Infectious Bursal Disease
  • Inclusion Body Hepatitis (IBH)

Related Post- Poultry Diseases with Classification


Salmonellosis is the foremost disease in broiler birds. It is intracellular & gram-negative bacteria. It is impossible to eliminate from the flock due to its 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.

Pullorum disease

It is caused by Salmonella pullorum and the most devastating disease for broiler chicks.

yolk color feces as well as whitish in salmonellosis in poultry

Primary clinical signs involved pesty vent with yolk color feces as well as whitish, dullness at standing position.

Postmortem finding

Salmonella pullorum in broiler chicks
salmonellosis in broiper chicks
Nevel ill with yolk color liver in Pullorum disease

Predominated gross findings are yolk mass found in the abdominal cavity and the liver became small with yolk color.

Fowl typhoid

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.

Postmortem findings

fowl typhoid in broiler chicks
Fowl typhoid in boriler
fowl typhoid
liver turns greenish color at fowl typhoid infection in broiler chicks

The yolk sac turns larger than normal. The liver became enlarge, congested, and in severe cases, it turns a greenish color.


Sulphanomide, tetracycline, broad-spectrum penicillin are totally resistant to Salmanelllosis. Aminoglycosides as gentamicin, amikacin, Neomycin, are effective in salmonellosis in the broiler. 

See also- Top 3 antibiotics for the fowl typhoid In Poultry

Cephalosporins 1st- 3rd generation-  cefradine, ceftriaxone, ceftiofur @ 10mg/ kg bodyweight successfully control salmonella infection in oral & parenteral route.

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Fowl Typhoid: Postmortem Findings In Chicks

Fowl Typhoid: PostmortemFindingsIn Chicks

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 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,

Clinical Signs

Primarily, hacking cough listens without interruption feeding & watering. Mycoplasma gallisepticum is only responsible for these clinical signs. There is no mortality that occurred

Secondly, hacking cough with a reduction of feed & water, that might be Mycoplasma complicated with other gram-positive & gram-negative organisms.

Clinical symptoms of the CCRD in broiler

This types of infection called Complicated chronic Respiratory disease (CCRD)Mortality reach to 50% in complicated with bacteria, virus & fungal infection

Postmortem findings

When Mycoplasma gallisepticum is responsible for hacking cough, air sac mildly dilated and drop bubble in the air sac.

Airsaculitis in Chronic respiratory disease
Air Sac
Airsac infection in poultry
Severe Airsaculitis in CRD

Besides, the 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. if the decrease intake feed consumption, birds suffering from intestinal and caecal coccidiosis.

Related Post- The best drugs for coccidiosis in poultry

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. This 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 the broiler feed.

Related Post

Broiler Diseases- Part 01

Antimycoplasmal Drugs | Tiamulin

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  1. Pingback: Omphalitis |Clinical Symptoms & Treatment - POULTRY MANIA

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