🐔 Classification of Poultry Diseases

Poultry diseases spread rapidly because birds live in groups, share feed and water, and respond quickly to poor hygiene or poor ventilation. That is why flock health depends more on prevention and biosecurity than on late treatment.

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What Is Meant by Poultry Disease?

The original lesson defines disease as a deviation from the normal state of health that leads to disturbed body function, reduced production, morbidity, or mortality.

For practical learning, poultry diseases in this lecture are grouped into:

• viral diseases
• bacterial diseases
• protozoan and parasitic diseases

Common signs of disease include dullness, reduced feed intake, reduced egg or meat output, diarrhea, weakness, and death in severe outbreaks.

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General Preventive Measures

The source notes list a very practical disease-control framework:

1. Buy chicks from reputed and disease-free sources.
2. Follow the vaccination programme strictly.
3. Keep houses dry, cool, clean, and well ventilated.
4. Keep sheds rodent-proof and fly-proof.
5. Sanitize litter, feeders, and waterers.
6. Dispose of dead birds and waste properly by burial or incineration.
7. Separate birds by age group.
8. Screen visitors and maintain personnel hygiene.
9. Use footbaths with disinfectant.
10. Follow the all-in all-out system where possible.

Biosecurity is the cheapest and most reliable first defense against poultry disease.

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Vaccination and Routes of Administration

Many viral diseases cannot be effectively controlled once they spread through a flock. So vaccination is central to poultry health management.

The original notes describe several routes of administration:

• drinking water for quick flock-level administration
• intraocular or intranasal instillation for direct mucosal immunization
• spray vaccination in hatcheries
• wing web puncture for fowl pox-type vaccination
• subcutaneous injection for specific vaccines such as certain Ranikhet schedules

Example:

• Lasota vaccine may be given by drinking water or eye drop.
• Fowl pox vaccine is commonly administered by wing web puncture.

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Vaccination Schedule Mentioned in the Original Notes

S.No.	Age	Vaccine	Route
1	1st day	Marek's disease vaccine	Subcutaneous injection at hatchery
2	7th day	Ranikhet disease F strain / Lasota; RD killed	Eye or nasal drop; killed vaccine by S/C
3	14-16 days	Infectious bursal disease (live) and IBD (killed)	Eye drop and S/C
4	21-24 days	Infectious bronchitis	Eye drop
5	30-35 days	Ranikhet disease Lasota strain	Eye drop
6	42-45 days	Infectious bursal disease (live)	Eye drop
7	56-70 days	Ranikhet disease "K" (mesogenic)	Subcutaneous
8	84-91 days	Fowl pox vaccine	Wing web puncture or intramuscular
9	91-98 days	Infectious bronchitis vaccine	Drinking water
10	126-133 days	Ranikhet disease "K" (mesogenic)	Subcutaneous injection

The lesson also notes some precautions:

• live and killed vaccines may be given on the same day by different personnel
• some vaccines are emphasized in outbreak-prone areas
• deworming may be advised before certain vaccination schedules

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Important Flock Health Operations

Debeaking

Debeaking is practiced mainly in layer birds to reduce feather pecking, cannibalism, and bullying. The original notes advise removing only a small portion of the upper beak and avoiding injury to the tongue.

Deworming

Deworming removes internal worms from the digestive tract. Heavy infestation may lead to weakness, emaciation, diarrhea, anemia, and fall in egg production.

Delicing

Delicing removes external parasites such as ticks, mites, and fleas. These parasites cause irritation, restlessness, wounds, anemia, and production loss.

These are supportive management practices and should be integrated with hygiene, ventilation, nutrition, and vaccination.

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Important Viral Diseases Mentioned

The source lesson specifically highlights:

• Ranikhet disease (Newcastle disease)
• Infectious bursal disease (IBD)

These are major poultry diseases because they spread rapidly and can cause serious economic loss. In examination terms, remember them as diseases where vaccination plus biosecurity is the central preventive strategy.

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Summary Cheat Sheet

Topic	Key Point
Disease groups	Viral, bacterial, protozoan/parasitic
Main preventive tool	Biosecurity plus vaccination
Vaccine routes	Drinking water, eye/nasal drop, spray, wing web, subcutaneous
Key health operations	Debeaking, deworming, delicing
Major viral examples	Ranikhet disease and IBD
Core management idea	Prevention is more effective than late treatment