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Growth Performance and Carcass Characteristics of Korean Native Ducks Fed Diets with Varying Levels of Limiting Amino Acids

  • Choo, Y.K. (Department of Animal Science and Technology, Konkuk University) ;
  • Kwon, H.J. (Department of Animal Science and Technology, Konkuk University) ;
  • Oh, S.T. (Department of Animal Science and Technology, Konkuk University) ;
  • Kang, C.W. (Department of Animal Science and Technology, Konkuk University) ;
  • Kim, H.K. (Poultry Science Division, National Institute of Animal Science, RDA) ;
  • Hong, E.C. (Poultry Science Division, National Institute of Animal Science, RDA) ;
  • Heo, K.N. (Poultry Science Division, National Institute of Animal Science, RDA) ;
  • Lee, S.K. (Department of Animal Products and Food Science, Kangwon National University) ;
  • An, B.K. (Department of Animal Science and Technology, Konkuk University)
  • Received : 2013.10.25
  • Accepted : 2013.12.17
  • Published : 2014.04.01

Abstract

There are multiple experiments conducted with male Korean native ducks (KND) to evaluate the optimal levels of limiting amino acids (AA). In Exp. 1, a total of 450 one-d-old male KNDs were divided into five groups with six replicates and fed experimental diets with varying levels of lysine, total sulfur amino acids (TSAA) and threonine (T1, 0.90/0.74/0.70%; T2, 1.00/0.82/0.77%; T3, 1.10/0.90/0.85%; T4, 1.20/0.98/0.93%; T5, 1.30/1.07/1.01%) to 21 d of age. In Exp. 2, one-d-old male KND were received and fed commercial starter diet from hatching to 21 d of age, and then divided into five groups with six replicates and fed one of five diets varying levels of lysine, TSAA, and threonine (T1, 0.73/0.62/0.54%; T2, 0.80/0.68/0.60%; T3, 0.87/0.74/0.65%; T4, 0.94/0.80/0.70%; T5, 1.01/0.86/0.75%) during 22 to 56 d of age, respectively. The BW gain was linearly increased as dietary limiting AA levels increased to 1.20% lysine, 0.98% TSAA and 0.93% threonine. There were no significant differences in feed intake, gain:feed and uniformity among groups. In Exp. 2, the BW gain and gain:feed were not affected by dietary limiting AA levels. There were no significant differences in carcass characteristics and meat quality among groups. The growth performance and carcass characteristics did not show the significant response to increasing dietary limiting AA levels in KND during 22 to 56 d of age. In conclusion, the levels of lysine, TSAA and threonine necessary to maximize growth for starter phase were at least 1.20%, 0.98%, and 0.93%, respectively. On the other hands, KND require relatively low levels of limiting AA for late growth and carcass yield. The dietary levels of 0.73% lysine, 0.62% TSAA and 0.54% threonine appear to be adequate during growing phase.

Keywords

Limiting Amino Acids;Growth Performance;Carcass Characteristic;Growing Stage;Korean Native Ducks

Acknowledgement

Supported by : National Institute of Animal Science

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