Cereal flour (such as cornmeal, wheat flour, etc.) contains a large amount of carbohydrates that are easily digested and absorbed. It is a cheaper energy source in the diet, but the protein content is less, and the biological value of the protein is not complete. Therefore, even if the corresponding protein is added, the feed should be increased. Utilization rate.
The amount of grain added to a fox diet depends on the biological value of the fox and the amount of fat in the mixed diet. The amount of grain feed added typically accounts for 15% to 30% of the calorie content of the diet. In China, corn flour is cooked into porridge, processed into oysters, fried, crushed and later fed to foxes. It is also fed in an expanded form. Processing of cooked grains can increase the digestibility by 10%-20%. Adding 0.1 grams of vitamin C to each fox’s feed during summer or cold winters can reduce the damage to animals from overheating or overcooling temperatures. Puffing is a promising method of processing. When the grain is puffed, carbohydrates are decomposed out of 6% dextrin, and 10% of the starch becomes sugar, which can be fully digested and absorbed by the fox. In addition, the grains can inactivate harmful bacteria after heat treatment to prevent foxes from having gastroenteritis, liver diseases, and diseases that affect reproduction.
White fox and Arctic fox have very low digestion and utilization of bran, because bran contains more cellulose and looses all foods to increase intestinal peristalsis and can be used in small quantities. In a fox diet, it should not exceed 10 grams. Sweet potatoes and potatoes with high starch content are very cheap energy sources. When cereals are deficient, they can completely replace cereals, but they must be washed and cooked before feeding.
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.
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