太湖鹅品种资源保护与发展对策

Chicken breeds are categorized as egg-type, meat-type, and dual-purpose. Leading egg-type breeds include Hy-Line Brown and Lohmann Brown, producing 310-320 eggs at 72 weeks with FCR around 2.1:1. White-feathered fast-growing broilers like AA+, Cobb, and Ross 308 reach 2.5-2.8 kg at 42 days. High-quality yellow-feathered breeds such as Sanhuang, Qingyuan, and Wenchang chickens are prized for excellent meat quality.

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.

Geese are classified as large, medium, and small types. Large breeds like Shitou goose reach 10-12 kg for adult males. Medium breeds like Wanxi White, Zhedong White, and Sichuan White weigh 5-7 kg and produce 30-50 eggs annually. Small breeds like Taihu, Huoyan, and Wulong geese have superior reproductive performance at 60-100 eggs per year, serving as important genetic resources.

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.

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.

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.

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.

Ducks have higher crude fiber utilization than chickens. Meat ducks in finishing phase require 16%-18% crude protein with 2900-3000 kcal/kg ME. Beijing ducks reach 3.2-3.5 kg at 42 days with FCR of 1.9-2.2:1. Geese primarily consume green roughage, with adults consuming 1.5-2.5 kg of grass daily and achieving 45%-50% crude fiber digestibility.

Modern farms should apply reduction, resource recovery, and harmless treatment principles. Common treatment processes include aerobic composting, anaerobic biogas fermentation, and biological conversion using fly larvae or earthworms. Wastewater undergoes sedimentation-anaerobic-aerobic combined treatment with reclaimed water reused for greening. Dead birds must undergo harmless treatment through high-temperature rendering or biodegradation.