The emu duck is named because of its strong musk scent during the breeding season. The duck originates in the tropical regions of South America and Central America. It is introduced by South China as the duck, and the foreign is called the turkey duck. The duck has the advantages of large body size, strong physique, strong viability, disease resistance, wide adaptability, rapid growth, easy fattening, good liver production performance, large fatty liver produced by male ducks, and the ability to feed without ponds , is a very promising type of lean meat, liver type, nourishing fine bird species, is the '97 national breeding industry science and technology poverty alleviation promotion project, but also a rural good, short, flat, quick and easy to become a good and well off a good project. The duck meat (liver) is delicate, with fresh and fragrant meat, crisp and soft bones, unique wild bird flavor, rich nutrition, and more lean meat (more than 80% lean). It is popular in the domestic and foreign markets. Exports of good products. The duck has white feather back black tail, white feather and black feather. Male and female ducks showed significant differences in body weight. The duck feed has a high utilization rate. Even if the dry feed does not exceed 150-160 grams per day for ducks during the peak period of free production, the consumption of feed does not exceed 90-100 grams per day after 100-110 days of age. Meat ratio 2.7-3:1. Sexual maturity is relatively late. The female ducks are about 150-180 days old. The average annual egg production is 150-180 eggs and the egg weight is 70-100 grams. Natural mating, male and female duck ratio 1:5-6, fertilization rate of 90% or more eggs, fertilized eggs hatching rate of more than 85%, incubation period 34-37 days. The survival rate of meat ducks exceeds 95%. Meat production performance is good. The vigorous growth period is about 10-11 weeks old. The live weight of the adult drake can reach 4-6 kilograms, the mother duck can reach 2.5-3 kilograms, and 80-90 days of age can be slaughtered for feeding. The half-net slaughterhouse slaughter rate was 82% for slaughter, 85% for mother ducks, 74% for clean net drakes and 75% for mother ducks. Liver production performance is good, 10 weeks of age feeding 2-3 weeks fat weight of 300-350 grams, is the ideal choice for the production of duck fat liver. Each egg consumption (including the breeding period) is about 380 grams.
Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo Greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
PC Board Venlo Greenhouse
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