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Effects of supplemental synthetic amino acids to the low protein diets on the performance of growing pigs |
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C. F. Jin, J. H. Kim, In K. Han, S. H. Bae |
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| Abstract |
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A total of 120 pigs (L횞LW횞D) averaged 14.16 kg of body weight were reared under six dietary treatments to evaluate the effects of amino acid supplementation on their performances. Treatments were 1) 18% CP diet (control); 2) 15% CP+0.28% Lys (B, 15L); 3) B+0.06% Met (15 LM); 4) B+0.13% Thr (15 LT); 5) B+0.06% Met+0.13 Thr (15LMT); 6) B+0.06% Met+0.13% Thr+0.05% Trp (15LMTT). Each treatment had 4 replicates with 5 pigs per replicate. The daily weight gains were statistically similar in 15 LMT, 15 LMTT and control groups. Threonine and methionine supplementation resulted in improved growth performance and nutrient digestibilities, while tryptophan supplementation had little beneficial effect. However, the best feed conversion was found in the control group. Dry matter and CP digestibilities were improved in the 15 LMT and 15 LMTT groups. Gross energy, crude fat and phosphorus digestibilities were not affected by the treatment. Among the 15% CP groups, nitrogen digestibility showed the tendency to be increased as the more synthetic amino acids were added. Dry matter and nitrogen excretions were significantly reduced by feeding low protein, amino acid fortified diets, while phosphorus excretion was not influenced. Essential amino acids digestibility was higher in 15 LT, 15 LMT and 15 LMTT groups and lover in the control. The 15 LT group showed the best lysine digestibility, and methionine digestibilities were higher in all treated groups than control one. Threonine digestibilities higher in 15 LT, 15 LMT, and 15 LMTT than the control. The result shows that threonine and methionine should be added to the diet containing 15% CP diet, fortified with lysine to get same performance of 18% CP diet. |
| Keywords:
Pigs; Protein; Lysine; Methionine; Threonine; Tryptophan |
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