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Interrelationship between methionine and cystine of early Peking ducklings.

Abstract
A 4 x 5 factorial experiment containing 4 cystine levels (0.325, 0.406, 0.487, or 0.568%) and 5 methionine levels (0.285, 0.385, 0.485, 0.585, or 0.685%) was conducted to evaluate the interrelationship between methionine and cystine in corn-peanut meal diet for Peking ducklings from hatch to 21 d of age. Eight hundred 1-d-old male white Peking ducklings were assigned to 20 experimental treatments. All treatments were replicated 4 times using 10 ducklings per pen. As dietary methionine level increased, weight gain and feed intake increased and then decreased; the quadratic response of weight gain was significant (P < 0.05). The methionine requirement for maximum efficiency of feed utilization (0.585%) was higher than for maximum weight gain (0.485%). According to the quadratic model, the optimal methionine requirement of Peking ducklings from hatch to 21 d of age was 0.481% (95% of the level at maximum response). The plasma uric acid concentration was very low (P < 0.05) when dietary methionine was 0.485%. When dietary methionine was excessive (0.685%), the plasma homocysteine concentration increased (P < 0.05). On the other hand, the cystine requirement of ducklings from hatch to 21 d of age was not more than 0.325%. A high level of cystine (0.568%) depressed weight gain and feed intake (P < 0.05), but cystine supplementation in the diets lowered the plasma homocysteine concentration (P < 0.05). There were no significant interactions between methionine and cystine on growth performance, plasma uric acid, and plasma homocysteine.
AuthorsM Xie, S S Hou, W Huang, L Zhao, J Y Yu, W Y Li, Y Y Wu
JournalPoultry science (Poult Sci) Vol. 83 Issue 10 Pg. 1703-8 (Oct 2004) ISSN: 0032-5791 [Print] England
PMID15510556 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Homocysteine
  • Uric Acid
  • Cystine
  • Methionine
Topics
  • Animal Feed
  • Animals
  • Chromatography, High Pressure Liquid
  • Colorimetry
  • Cystine (administration & dosage)
  • Diet (veterinary)
  • Dietary Supplements
  • Ducks (growth & development)
  • Eating (physiology)
  • Homocysteine (blood)
  • Male
  • Methionine (administration & dosage)
  • Uric Acid (blood)
  • Weight Gain (physiology)

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