🦠 Specific Diseases of Livestock & Poultry
Study FMD, rinderpest, anthrax, mastitis and Ranikhet disease for CUET Agriculture. Symptoms, causative agents and vaccination schedules.
Common Livestock Diseases
This section covers the most frequently encountered diseases in Indian livestock — from digestive disorders in cattle to parasitic infestations. Each disease is presented with its cause, symptoms, and treatment so you can identify and respond to them in practice and in exams.
1. Pechis (Dysentery)
Dysentery is a severe form of diarrhea characterized by the presence of blood and mucus in the feces. It is one of the most common killers of young calves, especially during hot weather when protozoan populations explode.
| Parameter | Detail |
|---|---|
| Cause | Protozoa — single-celled parasites that invade the intestinal lining and cause inflammation and bleeding |
| Mainly affects | Buffalo calves — they are particularly susceptible due to their immature immune systems |
| Season | Summer (epidemic during hot months) — warmth accelerates protozoan reproduction |
| Nature | Proverbial (commonly occurring) — farmers expect it every summer |
| Symptoms | Bloody diarrhea, weakness, dehydration, sunken eyes, rough coat |
| Treatment | Sulpha drugs at 33.3% dose, Ammonia ghol injection |
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Common Livestock Diseases
This section covers the most frequently encountered diseases in Indian livestock — from digestive disorders in cattle to parasitic infestations. Each disease is presented with its cause, symptoms, and treatment so you can identify and respond to them in practice and in exams.
1. Pechis (Dysentery)
Dysentery is a severe form of diarrhea characterized by the presence of blood and mucus in the feces. It is one of the most common killers of young calves, especially during hot weather when protozoan populations explode.
| Parameter | Detail |
|---|---|
| Cause | Protozoa — single-celled parasites that invade the intestinal lining and cause inflammation and bleeding |
| Mainly affects | Buffalo calves — they are particularly susceptible due to their immature immune systems |
| Season | Summer (epidemic during hot months) — warmth accelerates protozoan reproduction |
| Nature | Proverbial (commonly occurring) — farmers expect it every summer |
| Symptoms | Bloody diarrhea, weakness, dehydration, sunken eyes, rough coat |
| Treatment | Sulpha drugs at 33.3% dose, Ammonia ghol injection |
WARNING
Dehydration from dysentery can kill a calf within 24-48 hours. Oral Rehydration Solution (ORS) should be given alongside drug treatment to replace lost fluids and electrolytes.
2. Constipation (Kabz)
Constipation occurs when fecal matter becomes hard and dry, making it difficult or painful to pass. It is a non-infectious condition caused entirely by dietary imbalance — too much dry fodder and not enough green fodder or water.
| Parameter | Detail |
|---|---|
| Cause | Feeding only dry fodder without adequate green fodder or water — the rumen lacks sufficient moisture for proper digestion |
| Symptoms | Hard gobar (feces), reduced appetite, straining during defecation, abdominal discomfort, restlessness |
| Treatment | Oral administration of Alsi (Linseed) oil, Arandi (Castor) oil, or Til (Sesame) oil — these act as natural purgatives that lubricate the intestinal tract |
TIP
Prevention is simple: always provide a mix of dry and green fodder along with unlimited access to clean water. A healthy cow needs 50-80 liters of water daily.
3. Diarrhea (Atisaar)
Diarrhea differs from dysentery in that the feces are watery but typically without blood. It is caused by consuming contaminated or spoiled feed or water, which irritates the intestinal lining.
| Parameter | Detail |
|---|---|
| Cause | Consumption of bad/contaminated fodder or water — bacteria, molds, or toxins in spoiled feed trigger intestinal inflammation |
| Symptoms | Loose/watery feces, dehydration, loss of appetite, weakness, sunken flanks |
| Treatment | 160-220 gm oil + 300 gm Afeem (Opium) — the oil soothes the intestinal lining while Opium controls intestinal motility by slowing down excessive peristalsis |
Diarrhea vs Dysentery — How to tell them apart
| Feature | Diarrhea | Dysentery |
|---|---|---|
| Feces | Watery, no blood | Contains blood and mucus |
| Cause | Contaminated feed/water | Protozoa (parasitic infection) |
| Severity | Moderate | Severe |
| Treatment | Oil + Opium | Sulpha drugs |
Both conditions cause dehydration, so fluid replacement is critical in either case.
4. Mange / Scabies (Khaaj / Khujli)
Mange is a highly contagious parasitic skin disease caused by microscopic mites that burrow into or live on the skin. It causes intense itching, hair loss, and skin damage — leading to reduced milk production, weight loss, and secondary bacterial infections.
| Parameter | Detail |
|---|---|
| Cause | Mites (microscopic parasites) — different species affect different body areas |
| Symptoms | Intense itching, hair loss, reddened skin, scab formation, thickened skin, restlessness |
Four Types of Mange Mites:
Each mite species has a distinct behavior and affects a specific part of the body. Knowing which mite is involved helps determine the correct treatment approach.
| Mite Species | Characteristics |
|---|---|
| Sarcoptes | Burrows into skin, causes the most severe itching (Sarcoptic mange) — the mite tunnels through the epidermis to lay eggs |
| Psoroptes (Soroptis) | Lives on skin surface, causes scab formation — feeds on skin secretions and creates crusty lesions |
| Chorioptes (Coriooptis) | Affects legs and tail region — commonly seen in cattle, especially during winter housing |
| Demodex (Demodeks) | Lives in hair follicles, causes nodular lesions — produces characteristic lumps under the skin |
NOTE
Remember the mnemonic S-P-C-D: Sarcoptes burrows, Psoroptes stays on surface, Chorioptes attacks legs, Demodex lives in follicles.
Treatment: Sulphur 200, Sepia 200, Rhus Tox 200 (homeopathic remedies), plus insecticidal dips and sprays — the entire body must be treated, not just the visibly affected areas, because mites spread quickly.
5. Food Poisoning
Livestock can be poisoned by natural toxins present in certain feeds or by chemical contaminants like insecticides. Recognizing the source of poisoning is critical because each toxin requires a different antidote.
| Toxin | Source | Effect |
|---|---|---|
| Cyanogenetic Glucoside | Jowar (Sorghum) — especially young/stunted plants or those stressed by drought or frost | Releases cyanide (HCN) when eaten, blocks cellular respiration, causes sudden death |
| Gossypol | Binola (Cotton seed) cake — a yellow pigment in cotton seeds | Reduces iron absorption, causes anemia, damages heart and liver |
| Aflatoxin | Mungfali (Groundnut) — produced by Aspergillus flavus fungus in improperly stored groundnuts | Liver damage, reduced milk production, immunosuppression, can be carcinogenic |
| Insecticides | Various — Organophosphates, Organochlorines sprayed on crops | Nervous system damage, tremors, excessive salivation, convulsions |
IMPORTANT
Cyanide poisoning from Sorghum is one of the most common causes of sudden livestock death in India. Never feed young, frost-damaged, or drought-stressed Jowar to animals. If sorghum must be fed, dry it thoroughly first — drying allows HCN gas to escape.
Prevention: Proper storage of feed in dry conditions, avoid feeding young/frost-damaged sorghum, use only edible-grade oil cakes, and store groundnut in dry, well-ventilated conditions to prevent Aspergillus growth.
Antidotes for common poisoning
| Poison | Antidote |
|---|---|
| Cyanide (HCN) | Sodium Nitrite + Sodium Thiosulphate (IV injection) |
| Organophosphate | Atropine (the most important antidote to remember) |
| Gossypol | Ferrous Sulphate (iron supplementation) |
| Aflatoxin | No specific antidote — supportive care, remove contaminated feed |
6. Lice Infestation
Lice are external parasites (ectoparasites) that suck blood and cause irritation. Heavy infestations lead to anemia, poor coat condition, reduced milk yield, and weight loss. An important characteristic of lice is their host specificity — each livestock species has its own lice species.
Species-Specific Lice:
| Louse Species | Host Animal |
|---|---|
| Haematopinus | Cattle |
| Haematopinus bufali | Buffalo |
| Linognathus ovillus | Sheep |
| Linognathus pedalis | Goat (foot lice) |
| Linognathus stenopsis | Goat (body lice) |
| Microthoracius cameli | Camel |
NOTE
Each livestock species has its own specific louse species — cattle lice cannot survive on goats and vice versa. This host specificity is a frequently tested concept.
Treatment: Insecticides — Nigajjan, Malathion, Butanox (Bhutanax) — applied as dips, sprays, or pour-on solutions. Treatment must be repeated after 10-14 days to kill newly hatched lice from eggs (nits) that survived the first treatment.
Poultry Diseases
Poultry diseases cause massive economic losses in India. The four diseases below are the most important for both farm management and competitive exams.
1. Ranikhet Disease (Newcastle Disease)
This is the most important poultry disease in India. It is highly contagious and can wipe out an entire flock if birds are unvaccinated.
| Parameter | Detail |
|---|---|
| Cause | Paramyxovirus (Vishanu Type-1) — an RNA virus that is extremely resilient in the environment |
| Most affected | Young chicks (higher mortality) — adult birds may survive but with reduced production |
| Season | Rainy season — humidity helps the virus survive longer outside the host |
| Systems affected | Respiratory and nervous system — the virus attacks both, causing breathing difficulties and neurological signs |
| Symptoms | Bloody diarrhea, gasping, twisted neck (torticollis), wing paralysis, reduced egg production, greenish diarrhea |
| Mortality | Can reach up to 100% in unvaccinated flocks |
Vaccination Schedule:
This is one of the most commonly asked topics in CUET Agriculture and other competitive exams.
| Vaccine Strain | Age | Protection Duration |
|---|---|---|
| F1 strain (Lasota) | Day 1 (first day of life) | 15 weeks |
| R2B strain | 8 weeks | Lifelong protection |
IMPORTANT
The F1/Lasota vaccine is a live, mild strain given through eye drops or drinking water on the very first day of a chick's life. It provides temporary immunity for 15 weeks. The R2B strain is a stronger vaccine given at 8 weeks that provides permanent, lifelong immunity. Both vaccines are essential — F1 protects the vulnerable early period while R2B provides long-term coverage.
2. Fowl Pox (Chechak)
Fowl Pox is a slow-spreading viral disease that causes characteristic skin nodules and diphtheritic membranes. Once infected, the virus persists in the bird's body for life.
| Parameter | Detail |
|---|---|
| Cause | Pox virus — a large DNA virus that is very stable in the environment |
| Affects | Chicks aged 8-12 weeks — this is the most vulnerable age group |
| Season | Summer — spread increases through mosquito bites in warm weather |
| Duration | Lifetime disease (virus persists in the body) — recovered birds remain carriers |
Virus Species by Host:
Different bird species are infected by different pox virus strains — another example of host specificity.
| Virus | Host |
|---|---|
| Borrelliota avium | Chicken |
| Borrelliota meleagridis | Turkey |
| Borrelliota columbi | Pigeon |
Three Types of Fowl Pox:
| Type | Affected Area | Symptoms |
|---|---|---|
| Dry Pox (Cutaneous) | Skin — comb, wattle, face | Raised nodules/scabs on unfeathered skin — starts as small white spots that develop into dark crusty scabs |
| Wet Pox (Diphtheritic) | Mucous membranes — mouth, throat, trachea | Yellow-white patches (diphtheritic membranes), difficulty breathing — more dangerous than dry pox because it can block the airway |
| Mixed Pox | Both skin and mucous membranes | Combination of dry and wet symptoms — the most severe form |
WARNING
Wet Pox is more dangerous than Dry Pox because the diphtheritic membranes in the throat can cause suffocation. If you see birds gasping with yellow patches in the mouth, isolate them immediately.
3. Marek's Disease
Marek's Disease is a viral cancer of poultry caused by a herpes virus. It is one of the few naturally occurring cancers that can be prevented by vaccination — making it a landmark in both veterinary and human oncology research.
| Parameter | Detail |
|---|---|
| Cause | Herpes virus — a DNA virus that integrates into the host's cells |
| Affects | Chicks aged 3-4 months — though infection occurs much earlier |
| Symptoms | Paralysis of wings and legs, gray/cloudy eyes (ocular form), tumors in internal organs (visceral form) |
| Spread | Through feather follicle dander (highly contagious) — the virus is shed in tiny skin flakes that float in the air |
| Prevention | Vaccination at day-old chick stage — this is the only reliable prevention |
Forms of Marek's Disease:
Marek's Disease can manifest in four distinct forms, and a single bird may show signs of more than one form simultaneously.
| Form | Symptoms |
|---|---|
| Neural | Leg and wing paralysis — the classic sign is one leg stretched forward, one backward ("doing the splits") |
| Ocular | Gray/irregular pupil, blindness — the iris loses its normal color and becomes gray |
| Visceral | Tumors in liver, kidney, spleen, gonads — causes internal organ enlargement and eventual death |
| Cutaneous | Tumors in feather follicles — enlarged, rough follicles visible on plucked skin |
Why Marek's Disease vaccination is unique
Marek's vaccine is remarkable because it does not prevent infection — vaccinated birds still get infected by the virus. However, the vaccine prevents the virus from causing tumors and paralysis. The virus continues to replicate in feather follicles and is shed into the environment, but the bird remains healthy and productive. This is called "leaky" vaccination — it protects the individual but does not stop transmission.
4. Coccidiosis
Coccidiosis is the most common poultry disease worldwide. It is caused by protozoan parasites of the genus Eimeria that destroy the intestinal lining, causing bloody diarrhea and poor nutrient absorption.
| Parameter | Detail |
|---|---|
| Cause | Protozoa — Eimeria species — they complete their lifecycle inside the bird's intestinal cells |
| Distinction | Most common poultry disease worldwide — virtually every poultry farm encounters it |
| Mainly affects | Young chicks — they lack the immunity that develops with age and controlled exposure |
| Symptoms | Bloody diarrhea, ruffled feathers, droopy wings, reduced feed intake, dehydration, pale comb |
| Transmission | Through contaminated feed, water, or litter (fecal-oral route) — birds ingest Eimeria oocysts (eggs) from contaminated litter |
| Prevention | Coccidiostats in feed (preventive drugs mixed into the ration), proper litter management, good hygiene |
| Treatment | Sulpha drugs, Amprolium |
Important Eimeria Species in Poultry:
Different Eimeria species infect different parts of the intestine. Identifying the species tells the veterinarian where in the gut the damage is occurring.
| Species | Location | Severity |
|---|---|---|
| E. tenella | Caeca (blind gut) | Most pathogenic — causes severe bloody diarrhea; the caeca fill with blood |
| E. necatrix | Mid-intestine | Highly pathogenic — causes ballooning of the intestine |
| E. acervulina | Upper intestine (duodenum) | Moderate — causes white, ladder-like streaks on the intestinal wall |
| E. maxima | Mid-intestine | Moderate — causes thickening of the intestinal wall and orange mucus |
IMPORTANT
E. tenella is the most pathogenic Eimeria species — it specifically attacks the caeca (the two blind pouches at the junction of the small and large intestine). In severe infections, the caeca become distended with clotted blood, and the bird passes characteristic bloody droppings.
Wounds and Burns — Treatment Guide
Wound Classification
Understanding wound types helps determine the appropriate treatment approach — some wounds need suturing, others need drainage, and some need only surface cleaning.
| Type | Description |
|---|---|
| Incised wound | Clean cut by sharp instrument — smooth edges, bleeds freely but heals well |
| Lacerated wound | Torn, irregular edges — caused by blunt force, harder to heal, more prone to infection |
| Puncture wound | Deep, narrow wound — caused by nails, thorns, or pointed objects; dangerous because bacteria can be pushed deep inside |
| Contused wound | Bruise with tissue damage — caused by blunt impact, no skin break but internal tissue is damaged |
| Abrasion | Surface scraping of skin — superficial, heals quickly but can be painful |
Wound Treatment Steps
The six-step wound treatment protocol ensures proper healing and prevents secondary infection:
- Stop bleeding — apply pressure, use astringents (Fitkari/Alum, Tincture Iodine)
- Clean the wound — wash with antiseptic solution (KMNO₄ 1%, Dettol)
- Remove debris — clean out dirt, dead tissue (debridement)
- Apply antiseptic — Iodine, Boric acid solution to prevent microbial colonization
- Bandage — protect from contamination and flies — change bandage daily
- Administer antibiotics — Penicillin or Streptomycin to prevent systemic infection
TIP
Remember the sequence: Stop → Clean → Remove → Apply → Bandage → Antibiotics (SCRA-BA). This order matters — stopping the bleeding first takes priority over everything else.
Burn Treatment
Burns are classified by depth of tissue damage. The treatment escalates with severity.
| Degree | Severity | Treatment |
|---|---|---|
| First degree | Redness, pain — only the outer skin layer (epidermis) is affected | Cold water application, soothing ointment |
| Second degree | Blistering — both epidermis and dermis are damaged | Antiseptic cream, bandaging, antibiotics to prevent infection |
| Third degree | Full thickness skin damage — all skin layers destroyed | Veterinary emergency — IV fluids, extensive care, possible skin grafting |
- Apply Burnol or tannic acid jelly for superficial burns — these form a protective coating over the burn
- Administer IV fluids for severe burns to prevent shock — burns cause massive fluid loss through the damaged skin
- Antibiotics to prevent secondary infection — burned skin has no barrier against bacteria
Quick Comparison — Poultry Diseases
This table is ideal for last-minute exam revision. It captures the four most important poultry diseases at a glance.
| Disease | Causative Agent | Age Most Affected | Key Symptom | Vaccine |
|---|---|---|---|---|
| Ranikhet | Paramyxovirus | Young chicks | Twisted neck, bloody diarrhea | F1 (Day 1), R2B (8 weeks) |
| Fowl Pox | Pox virus | 8-12 weeks | Skin nodules/scabs | Fowl pox vaccine |
| Marek's | Herpes virus | 3-4 months | Leg paralysis, gray eyes | Day-old vaccination |
| Coccidiosis | Eimeria (Protozoa) | Young chicks | Bloody diarrhea | Coccidiostats in feed |
Key Points for Exam
- Ranikhet = most important poultry disease, caused by Paramyxovirus
- Ranikhet vaccines: F1/Lasota (Day 1, 15 weeks) and R2B (8 weeks, lifelong)
- Coccidiosis = most common poultry disease, caused by Eimeria protozoa
- Marek's disease = Herpes virus, causes paralysis and gray eyes at 3-4 months
- Fowl Pox = 3 types (Dry, Wet, Mixed), affects 8-12 weeks, summer disease
- Mange has 4 mite types: Sarcoptes, Psoroptes, Chorioptes, Demodex
- Cyanogenetic glucoside from Jowar causes cyanide poisoning
- Gossypol from Binola reduces iron; Aflatoxin from Mungfali damages liver
- Dysentery mainly affects buffalo calves, caused by protozoa, treated with Sulpha drugs at 33.3% dose
- Eimeria tenella is the most pathogenic coccidiosis species (affects caeca)
- Each livestock species has its own specific louse species
- Atropine is the antidote for organophosphate poisoning
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Dysentery (Pechis) | Cause: Protozoa; Mainly affects: buffalo calves; Season: summer; Treatment: Sulpha drugs at 33.3% dose |
| Constipation (Kabz) | Cause: dry fodder without green fodder/water; Treatment: Alsi (linseed), Arandi (castor), Til (sesame) oil |
| Diarrhea (Atisaar) | Cause: contaminated feed/water; Treatment: 160–220 gm oil + 300 gm Afeem (Opium) |
| Diarrhea vs Dysentery | Diarrhea = watery, no blood; Dysentery = blood and mucus in feces |
| Mange / Scabies | Cause: mites; 4 types: Sarcoptes (burrows), Psoroptes (surface/scabs), Chorioptes (legs/tail), Demodex (hair follicles) |
| Cyanogenetic Glucoside | Source: Jowar (Sorghum); Releases cyanide (HCN); Causes sudden death |
| Gossypol | Source: Binola (cotton seed) cake; Reduces iron absorption |
| Aflatoxin | Source: Mungfali (groundnut); Produced by Aspergillus flavus; Causes liver damage |
| Organophosphate antidote | Atropine |
| Lice — host specificity | Each livestock species has its own specific louse species |
| Ranikhet Disease (Newcastle) | Most important poultry disease; Cause: Paramyxovirus; Season: rainy; Symptoms: twisted neck, bloody diarrhea; Mortality: up to 100% |
| Ranikhet vaccines | F1/Lasota (Day 1, protects 15 weeks); R2B (8 weeks, lifelong protection) |
| Fowl Pox (Chechak) | Cause: Pox virus; Affects: 8–12 weeks; Season: summer; 3 types: Dry (skin nodules), Wet (yellow patches — more dangerous), Mixed |
| Marek's Disease | Cause: Herpes virus; Affects: 3–4 months; 4 forms: Neural (leg paralysis), Ocular (gray eyes), Visceral (tumors), Cutaneous; Vaccination at day-old |
| Coccidiosis | Most common poultry disease worldwide; Cause: Eimeria (protozoa); Treatment: Sulpha drugs, Amprolium |
| E. tenella | Most pathogenic Eimeria species; Attacks caeca; Causes severe bloody diarrhea |
| Wound treatment steps | Stop bleeding -> Clean -> Remove debris -> Apply antiseptic -> Bandage -> Antibiotics |
| Wound astringents | Fitkari (Alum), Tincture Iodine to stop bleeding |
| Wound cleaning | KMNO₄ 1% |
| Burn treatment | Burnol or tannic acid jelly for superficial burns; IV fluids for severe burns |
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