feed additive is added to the various trace elements, including the synthesis of amino acids, vitamins, trace elements, antibiotics, enzymes, hormones, antioxidants, deworming drugs, antifungal agents and coloring agents. Such feed is increased with the intensification of animal husbandry and feed industries and developed. First, a small amount of its characteristics, the role of big; second storage conditions are higher, such as vitamins, enzymes, hormones generally not very stable, low temperature preservation; Third, the cost of large, used to plan carefully and guard against waste . Such feed can be roughly divided into two categories:
(A),nutritional additives
1. Vitamin additive is produced by the method of synthesis or purification of a single or multi-vitamin. Commonly used are vitamin A, vitamin D, vitamin E, vitamin K, B vitamins and choline chloride, etc.. In beef cattle, because the rumen microorganisms to synthesize most of the B vitamins, such as feed supply balance, normally not to such a vitamin deficiency. However, vitamin A, vitamin D, vitamin E, vitamin K and other fat-soluble vitamins should also add
2. Livestock are often vulnerable to lack of trace element additive trace elements copper, zinc, manganese, iron, cobalt, iodine, selenium. Generally made of composite additives added.
Other tips for the three points:
① strict control additive amount and pay attention to hybrid technology, if the mixture evenly, then he will bring the loss of production;
② must consider the interrelationship between these elements, and some will have antagonistic effects, so that utilization declined, so would not achieve the desired effects;
③ to contain these elements are usually added salt to the elements, and these salts often contain some crystal water, the use should pay attention to dry, kept under seal.
3. Amino acid amino acid additives for livestock feed additives, usually plant feed sorely lacking essential amino acids such as methionine and lysine.
4. Non-protein nitrogen urea material can be added to the diet of beef cattle and other ruminants, used to add nitrogen. Commonly used are urea, biuret, ammonium phosphate, ammonium chloride and so on.
(B), non-nutritional additives
These additives in the feed itself can not afford to nutritional effects, but can stimulate metabolism, insect, disease control and other functions. Have protective effects on the feed from.
1. Add a small amount of antibiotic feed antibiotics, resistance may play a role in disease prevention.
2. Promotor is to promote growth, improve feed utilization effect. Growth hormone, testosterone, zeranol, arsenic preparations, copper agent.
3. Protective agent who feed containing more than fat, because fat and fat-soluble vitamin easily oxidized in air (especially in hot weather will occur rancidity) in beef cattle fed these substances will affect the feeding effects. Therefore, antioxidants are often added to protect. Common antioxidants are butyl hydroxy anisole, butyl hydroxy toluene a, ethoxy quinoline, etc.. In addition, antifungal agents, such as propionic acid, calcium propionate, as well as coloring agents, flavoring agents.