鸡传染性喉气管炎的诊疗体会

Disease prevention is the top priority in poultry farming. Common diseases fall into four categories: viral, bacterial, parasitic, and nutritional-metabolic. Viral diseases include avian influenza, Newcastle disease, infectious bursal disease, and Marek disease, most characterized by rapid transmission and high mortality. Bacterial diseases include pullorum, colibacillosis, infectious coryza, and chronic respiratory disease.

Vaccination is the core measure for preventing infectious diseases. Standard layer immunization: Marek vaccine at day 1, ND-IB bivalent at day 7, IBD at day 14, ND booster at day 21, AI vaccine at day 35, and EDS vaccine before laying. All vaccinations must follow proper procedures, and vaccines must be used within 2 hours of dilution.

Major duck diseases include duck plague, duck viral hepatitis, infectious serositis, and Tembusu virus disease. Duck plague mortality can exceed 90%. Duck viral hepatitis primarily affects ducklings under 3 weeks. Major goose diseases include gosling plague, paramyxovirus disease, and fowl cholera. Gosling plague caused by parvovirus has 70%-100% mortality.

Medication plays a supporting role in disease control. Antibiotics for bacterial diseases should be selected based on sensitivity testing to avoid resistance. Coccidiosis control uses rotation or shuttle programs. Chinese herbs like Coptis, Scutellaria, Isatis, and Astragalus polysaccharides effectively boost immunity as antibiotic alternatives.

Biosecurity system construction is fundamental for disease prevention. Farms should implement closed management with strict control of external personnel and vehicles. Production, living, and isolation zones should be separated with disinfection channels between them. Workers must change clothing and footwear before entering production areas. Dead birds must be properly disposed of through harmless treatment.

Goose farming profitability varies by model and breed. Commercial geese take 70-90 days reaching 4-6 kg, with 3-4 batches possible annually in southern regions. Production cost is 45-55 yuan per bird including 10-15 yuan for goslings and 25-30 yuan for feed. Common white geese sell at 16-20 yuan/kg while premium breeds like Shitou reach 25-30 yuan/kg.

Scientific diet formulation is key to controlling farming costs. Chicks (0-6 weeks) require crude protein at 20%-22% and metabolizable energy of 2800-2900 kcal/kg. Growing chickens (7-20 weeks) need protein reduced to 16%-18% with increased crude fiber. Laying hens require 16%-17% crude protein, 3.5%-4.0% calcium, and 0.5%-0.6% phosphorus, with a Ca:P ratio of 5:1 to 6:1.

As environmental regulations tighten, treatment and resource utilization of livestock waste has become critical. Poultry manure contains rich organic matter and NPK nutrients. Each layer produces 40-50 kg of fresh manure annually. After composting treatment, a 10,000-bird layer farm can produce 200-250 tons of organic fertilizer worth approximately 100,000-150,000 yuan.

China has rich duck breed resources. Beijing duck is world-famous, serving as the ideal raw material for Peking roast duck and the genetic foundation for Cherry Valley ducks. Cherry Valley ducks feature faster growth, higher breast meat yield, and better FCR, dominating global commercial duck production. Muscovy ducks offer tender lean meat, and crossbreeding produces fast-growing mule ducks.

Egg selection and management decisively affect hatching outcomes. Hatching eggs should come from healthy high-yield breeding flocks with appropriate weight (55-65g for chicken, 80-100g for duck, 150-200g for goose), normal shape index, and clean uncracked shells. Storage should not exceed 7 days at 13-18C and 75%-80% humidity, large end up. Fumigation disinfection is required before setting.

Chicken house construction should follow all-in-all-out principles. Environmentally controlled houses use negative pressure longitudinal ventilation, cooling pads, and automatic lighting systems to effectively control the microclimate. Floor density for broilers is 8-12 birds/m2, slatted floor 12-16/m2, and cages 20-30/m2. Layer cages provide approximately 400-500 cm2 per bird.