Feed is an inorganic and organic compound composed of various elements. These compounds have certain health-preserving effects, so they are called nutrients, such as protein, fat, carbohydrates, minerals, vitamins, water, etc.

(1) General nutrients in feed and their descriptions Our commonly used feed nutrients refer to general nutrients, and their classification and description are based on the routine analysis of feed.

1. moisture feed samples are baked to constant weight at a certain temperature, and the weight loss is moisture. The residue after dehydration of feed is called dry matter. Dry matter can be divided into air-dried matter and completely dry matter. The sample is dried to constant weight in 60 ~ 65 * 0 t, and its dry matter is called air-dried; The sample range is from 100 to 105. CT is baked to constant weight, and its dry matter is called total dry matter.

2. Coarse Ash Put a certain amount of feed dry matter into a high-temperature furnace and burn it at 550-600℃. The ashes left in www.myyzw.com are called ashes. Ash, also known as minerals, is mainly inorganic substances contained in feed. Because some minerals are oxidized in the combustion process, they become oxides or carbonates; In addition, the sample is often mixed with a small amount of impurities such as sand, so the word "coarse" is often added before the ash, which is called coarse ash.

3. Crude protein is the general name of nitrogen compounds in feed organic matter. In addition to pure protein (true protein), it also includes various nitrogen-containing non-protein compounds, which are called ammoniated nitrogen or non-protein nitrogen (NPN) in animal nutrition.

4. Non-nitrogen compounds in natural fatty organic compounds can be dissolved in organic solvents such as ether. Among them, triglycerides are the main components, including sterols and complex lipids (phospholipids, glycolipids, etc. ), wax and free organic acids.

5. The remaining part of crude fiber after degreasing nitrogen-free organic matter is called carbohydrate. It is mainly composed of carbon, hydrogen and oxygen. If the defatted sample is treated with acid and alkali, the insoluble residue is crude fiber, mainly plant cell wall components, including cellulose, hemicellulose, lignin and polycondensate.

6. When crude fiber is determined by nitrogen-free extract, the acid-soluble part is called nitrogen-free extract, including monosaccharide, disaccharide, starch, pectin and organic acids other than fat. Because of its complex composition, the actual beef cattle analysis is usually not carried out, but is indirectly calculated according to the analysis results of other nutritional components in the feed according to the following formula.