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Objective of study determining diet formula for 4-breeds exotic hybrid with optimal protein level bases on balancing some essential amino acids includes: lysine, methionine and threonine in order to improve grow capacity, feed utilization efficiency and to reduce urinal and faecal nitrogen and phosphorus excretion; formulating some formulas base on the local ingredients with optimal protein and amino acids level to ensure production efficiency of exotic 4-breeds hybrid and to reduce environment pollution in pig production. | 1 INTRODUCTION 1. The demand of the research study Currently in order to adequate domestic consumption as well as export market demand for pork consumption beside increasing of rearing local swine breeds and hybrid of exotic with local breeds it s a tendency that to keep hybrids with 4 - 5 exotic swine breeds which attracts more attention of farmers to expand their production. A part from improvement of the breed in term of productivity and quality it also requires improvement in term of nutrition for animals especially research on requirement of protein and amino acid for growing pigs. The modern opinion on animal nutrition considers that protein requirement is the requirement of amino acids. If there is inadequacy of essential amino acids supplement in term of quantity and amino acid balance then it would lead to retard of grow in animal which would affect production and economic efficiency. On the other hand though it is enough protein or even surplus protein in pig diet but this is unbalanced of essential amino acids then digestibility and feed utilization efficiency of the diet will be reduced. Thus the reduction of protein level in the diet and supplement of synthesized amino acids are the best solutions to adequate animal requirement of amino acids and also reduce environmental pollution in pig production. When calculate protein requirement in pig diet the calculation of protein levels are usually based on the studies on protein requirement or just adopt the published standard for the main amino acids requirements such as lysine and methionine however other amino acids requirement is not estimated. In order to meet amino acids requirement for pig. Pig producers and feed processing companies usually use the formula with high level of protein to formulate feed without taking into account the insufficient of protein utilization due to the surplus of amino acids which leads to a surplus of nitrogen and sulfur excreted into environment. In addition the price of .
