During autumn and winter, when temperatures plummet and poultry houses suffer from inadequate ventilation, viruses tend to proliferate and spread in enclosed environments, leading to a peak incidence of Marek's disease (MD) in chickens. This infectious tumor disease caused by Marek's virus is virtually untreatable once infected in chicks, earning it the reputation as a "silent killer" in poultry farms. Only through scientific prevention and control measures can a robust health defense line be established for the flock.
I. Recognizing Marek's Disease: Early Identification for Early Intervention.
Jomma disease primarily affects the immune organs of chicks, with peak susceptibility occurring between 1-5 weeks of age. The virus is transmitted via the respiratory tract, and the virus in the feathers and scales of infected chickens can survive in the environment for several months, posing a persistent threat to flock safety.
• Neurogenic typical symptoms: Chickens exhibit a "split" posture, unilateral leg paralysis with inability to stand, or drooping wings, neck twisting, and head tilting, ultimately dying from starvation due to inability to feed.
• The visceral type poses greater risks: The flock exhibits depression and rapid emaciation. Postmortem examination reveals grayish-white tumor nodules in viscera such as the liver and spleen, with an extremely high mortality rate.
• Ocular and cutaneous forms: Iridial hypopigmentation with whitening, pupillary deformation, or gray-white nodules at the combs, affecting flock vision and carcass quality.
II. Vaccination serves as the first line of defense, with precise administration being critical.
Vaccination is the cornerstone of Marek's disease prevention in poultry, requiring adherence to three fundamental principles: "early, accurate, and strict".
✅ Early vaccination: The first dose must be administered within 24 hours after hatching, as earlier immunization enables the establishment of an immune barrier prior to viral invasion.
✅ Select appropriate vaccine: For commercial chickens, the first-line vaccine is the Herpesvirus Vaccine for Turkeys (HVT), which offers high safety and strong protective efficacy. For breeding chickens, bivalent or trivalent vaccines may be selected to enhance protection levels.
✅ Strict protocol: Subcutaneous injection at the neck, with dosage strictly adhering to the instructions to avoid missed or incorrect immunization. Maintain detailed records for post-immunization traceability.
Post-immunization nutritional supplementation: After vaccination, chicks may experience transient fluctuations in immunity. The addition of "Vitapul (SPEEDVITA)" to drinking water can supplement vitamins, amino acids, and other nutrients, promote the development of immune organs, enhance vaccine response efficacy, and reduce stress reactions.
III. Feeding Management + Environmental Disinfection to Interrupt Viral Transmission Chains Vaccines are not "panaceas"; only through meticulous management can transmission routes be completely severed:
1. Full In and Out + Thorough Disinfection: Only chickens from the same batch should be housed in the same coop. After slaughter, the coop should be rinsed with high-pressure water jets, with particular attention to removing feather dander. Subsequently, disinfection should be performed using peracetic acid or sodium hypochlorite. The coop should remain vacant for 1-2 weeks before introducing new chicks.
2. Closed management of broiler houses: Broiler houses shall be isolated and strictly prohibited from entry by external personnel. All personnel entering or exiting must change into disinfectant clothing and disinfectant shoe soles.
3. Regular environmental disinfection: Disinfect the chicken coop and cages 2-3 times per week, with particular attention to areas prone to viral proliferation such as ventilation outlets, feed troughs, and waterers.
4. Nutrition and Stress Management: Ensure balanced feed nutrition by supplementing with "Vitamin B Complex" to alleviate stress caused by low temperature and high density in chicks, thereby enhancing overall immunity.
IV. Routine Monitoring: Early Detection and Rapid Response.
• Conduct daily inspections of the flock, immediately isolate and cull sick chickens exhibiting "split legs", paralysis, or emaciation, and thoroughly disinfect the contact areas.
• Conduct post-mortem sampling and inspection prior to slaughter. If typical pathological changes such as visceral tumors or nerve swelling are detected, the poultry house must undergo comprehensive disinfection and purification.
• If sporadic deaths or emaciation occur in the flock without apparent cause, promptly submit samples for laboratory testing to rule out Marek's disease and prevent the spread of subclinical infections.
Key Reminder:
The Marek's disease vaccine only prevents disease onset and cannot stop viral infection. Post-vaccination, poultry flocks still require environmental control measures to avoid exposure to highly virulent pathogens. Additionally, Marek's disease shares similar clinical manifestations with avian lymphocytic leukemia (ALL), necessitating differentiation through characteristic symptoms such as "neuritis." Veterinary confirmation is required when necessary. Blind treatment should be avoided.
The autumn and winter seasons are critical periods for poultry disease prevention and control. From vaccination to feeding management, every aspect must be rigorously monitored. The effective use of nutritional supplements such as "SPEEDVITA" and "Vitamin B Complex," combined with scientific prevention and control measures, can ensure the safe passage of poultry flocks through high-incidence periods, thereby establishing a solid foundation for breeding efficiency.