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Abstract

The purpose of this experiment was to study the effect of varying levels of tryptophan on the performance and carcass character of broiler. Trial 1: Ninety-six, five-week-old male Hubbard chickens, average weight 1.97 kg, were used in the trial. All birds were allocated into 3 treatments of 32 birds each. Each bird was kept in an individual cage. The trial period was 3 weeks. Treatment 1: Tryptophan content 0.198%. Treatment 2: Tryptophan content 0.228%. Treatment 3: Tryptophan content 0.258%. Trial 2: Ninety-six, three-week-old male Hubbard chickens, average weight 1.23 kg, were randomly distributed into the following two treatments. Each treatment had 48 birds. Treatment 1: Tryptophan content 0.167%. Treatment 2: Tryptophan content 0.198%. Trial 3: Ninety-six, twoweek-old Hubbard chickens, average body weight 0.72 kg, were used in this experiment. There were three treatments as follows. Treatment 1. Tryptophan content 0.136%. Treatment 2. Tryptophan content 0.167%. Treatment 3. Tryptophan content 0.198%. The result of Trial 1 showed that the feed intake, performance, and carcass characteristics were not influenced by tryptophan content in the diet which between 0.198% and 0.258% (p>0.05). There was no significant difference (p>0.05) in feed intake in either treatment in Trial 2. However, weight gain, feed conversion efficiency, and most carcass characteristics in the 0.198% treatment were significantly better (p<0.05) than in the 0.167% treatment. There was a trend that feed intake increased with increasing level of tryptophan, but there was no significant difference in Trial 3. The weight gain and feed conversion efficiency were significantly reduced for the broiler in the 0.136% treatment. This series of experiment showed that broilers need about 0.198% of tryptophan.

참고문헌 (9)

  1. National Research Council. 1984. Nutrient Requirements of Poultry. 8th ed. National Academy Press. Washington, DC. 
  2. Smith, N. K, Jr. and P. W. Waldroup. 1987. Estimation of tryptophan requirement of male broiler chickens. Poult. Sci. 67:1174-1177. 
  3. Tabiri, H. Y., K. Sato, K. Takahashi, M. Toyomizu and Y. Akiba. 2002. Effects of heat stress and dietary tryptophan on performance and plasma amino acid concentrations of broiler chickens. Asian-Aust. J. Anim. Sci. 15(2):247-253. 
  4. Voet, D and J. G. Voet. 1995. Biochemistry (2nd Edition). John Wiley & Sons, Inc. New York. 
  5. Henry, Y. and B. Seve. 1993. Feed intake and dietary amino acid balance in growing pigs with special reference to lysine, tryptophan and threonine. Pig News and Information 14(1):35-43. 
  6. Hewitt, D. and D. Lewis. 1972. The amino acid requirement of the growing chick. Poult. Sci. 13:449-463. 
  7. National Research Council. 1994. Nutrient Requirements of Poultry. 9th ed. National Academy Press. Washington, DC. 
  8. National Research Council. 1977. Nutrient Requirements of Poultry. 7th ed. National Academy Press. Washington, DC. 
  9. National Research Council. 1971. Nutrient Requirements of Poultry. 6th ed. National Academy Press. Washington, DC. 

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