First, the use of hybrid pig fattening can be used Changbai, Yorkshire, Duroc, Hampshire and other lean boar hybrids with the local purebred sows, but also can use foreign three-way hybrids to produce lean commercial pigs. That is, the above-mentioned hybrid generation is used as a female parent, and another kind of lean-type boar is used as a parent to produce a commercial pig. The cross-breeding pigs produced in this way have strong disease resistance, are robust, and are born with a single weight, and then they can produce high-efficiency lean-type commercial pigs through scientific breeding techniques. Second, the use of consistent fattening method In order to increase economic efficiency, we must adopt a consistent fattening method, also known as "straight fattening method", but can not engage in traditional hanging shelf fattening method. This will shorten the feeding cycle from about one year to about six months. At the same time, we must also pay attention to the following three links: 1. Rational use of compound feed. When raising the piglets up to 50kg, the crude protein in the compound feed should reach 16%-18%, digestive energy should reach 2.8 Mcal/kg, and feed 0.75-1.5kg per day, and gradually increase from small to large. In the stage of 50kg to 90kg, the crude protein in the compound feed is 12%-14%; the compound feed 1.5-2.5kg is fed every day, and the feed quantity is gradually increased. The amount of daily feeding in two stages should be increased by 0.2kg every 10-15 days until the high limit. 2. Change cooked and feed for life. This will not only save a lot of fuel, reduce costs, but also avoid the destruction of large amounts of vitamins due to cooking. However, the beans in the compound feed must be fried and crushed before use. 3. Pay attention to the feeding method. Feed 2 times a day, first feed the concentrate, feed the green material, and finally feed the water. Do not feed with fine material and green material. The concentrate can be mixed with wet feed. The ratio of feed water is 1:2. The green material can be chopped and the drinking water supplied must be clean. Third, to strengthen management and disease prevention and control, pigs should first carry out the injection of swine fever, foot and mouth disease, blue ear disease, lung disease; every 2 weeks with 20% lime milk, 30% grass ash, 3% sodium hydroxide solution alternate Disinfect the quarters. Shelter and import and export, to set up sodium hydroxide solution or lime water disinfection pit; pigs 30kg-50kg, each should drive a parasite within the body; the shed cleaning and maintenance, often kept clean and dry. The pig house should be warm in winter and cool in summer; after the lap, emphasis should be placed on teaching to eat, sleep, and pull urine to locate the urine;
Everything You Need To Know About LED Lighting
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
The technical essentials for the production of lean-type commercial pigs
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