Poultry intake of dietary protein in the body under the action of digestive enzymes and then broken down into amino acids in metabolism. Feed a number of anti-enzyme factors affecting digestive enzyme activity, resulting in decreased amino acid digestibility. Amino acids resulting from protein digestion can not be animal use, dietary amino acids in broilers, amino acid imbalance and so the poultry on the absorption of amino acids, only when the proportion of dietary amino acid composition and is consistent with the needs of poultry (the ideal AA model) poultry to maximize the use of feed protein. Fish meal as animal protein feed, amino acid composition and body composition of poultry is similar to the highest absorption rate. But the Chinese as fish meal, fewer resources are expensive, and the growth of bacteria, causing bacterial contamination of poultry feed, fish meal has been rarely used, but with vegetable protein feed as a substitute for fish meal. Vegetable protein feed with soybean meal and the best quality, amino acids Ye Hao, high utilization, are widely used in poultry feed, but soybean production in China is far short of demand.
China, a wide variety of miscellaneous meal, yield rich, there are a lot of blood meal, feather meal, leather powder unconventional materials, use of mixed meal and other non-conventional low-cost protein feed into the development of livestock production. Miscellaneous meal and protein digestibility of the existence of unconventional raw materials, amino acids are not as soybean meal protein using less effective, such as the improper use of low utilization rate of amino acids, the protein that is a waste of resources, pollute the environment, but also affect the animal production results. Studies have shown that the use of miscellaneous non-conventional protein meal and raw materials, the application of digestible amino acid balance of dietary amino acid preparation is much better than the total effect of amino acid diets, can reduce the amount of protein, increased amino acid utilization, a reduction of N emissions reduce environmental pollution, but also to improve the production performance of poultry.
Amino acid balance in the model, the amino acid lysine as a basis for more appropriate on the grounds that:
① lysine is chicken feed commodity second only to sulfur amino acid essential amino acid;
② can add monomer, more economical in production;
③ with sulfur amino acids in different, easy to analyze;
④ with different sulfur amino acids, its only function is to increase the protein;
⑤ under different conditions (diet, environment, body composition, etc.) on the lysine requirement of broiler research data and more.
Preparation of dietary amino acid balance in three forms:
(A) of the protein synthesis of amino acids added. In poultry feed methionine and lysine is usually the first and second limiting amino acids. When the minimum in the formula of dietary protein, methionine and lysine standards needed to join in the synthesis of methionine and lysine, and threonine and tryptophan.
(B) the amino acid utilization rate has been adjusted increase of protein synthesis of amino acids, high quality soybean meal or fish meal as the standard amino acid utilization, the utilization of other amino acids in feed converted to the relative efficiency (see Table 1).
(C) to digestible (using) amino acid diets. Application digestible (using) the concept of preparing amino acid diets need to have all kinds of poultry feed and poultry digestible amino acid digestibility (using) amino acid requirement. Amino acid digestibility of poultry feed on a variety of Table 2, Table 3; poultry