Effect of Dietary Metabolizable Energy and Crude Protein Concentrations on Growth Performance and Carcass Characteristics of Korean Native Ducks
2012
Kim, H.R., Konkuk University, Seoul, Republic of Korea | Kwon, H.J., Konkuk University, Seoul, Republic of Korea | Oh, S.T., Konkuk University, Seoul, Republic of Korea | Yun, J.G., Konkuk University, Seoul, Republic of Korea | Choi, Y.I., Konkuk University, Seoul, Republic of Korea | Choo, Y.K., Konkuk University, Seoul, Republic of Korea | Kang, B.S., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Kim, H.K., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Hong, E.C., National Institute of Animal Science, RDA, Suwon, Republic of Korea | Kang, C.W., Konkuk University, Seoul, Republic of Korea | An, B.K., Konkuk University, Seoul, Republic of Korea
This study was undertaken to assess dietary CP and ME concentrations for optimum growth performance and carcass characteristics of Korean Native male ducks. In a 3 × 3 factorial arrangement, 1-d-old Korean Native male ducks were completely randomized design to experimental diets with 3,000, 2,900, and 2,800 kcal of ME/kg of diet; each contained 23, 22, and 21% CP, respectively, from 0 to 3 wk of age. From 4 to 8 wk of age, experimental diets had 3,100, 3,000, and 2,900 kcal of ME/kg of diet, and each contained 19, 18, and 17% CP, respectively. Each dietary treatment was replicated 4 times, and feed and water were provided ad libitum. Body weight, feed intake and uniformity were measured at 3 wk and 8 wk, and carcass characteristics were evaluated at 8 wk. As CP increased from 21 to 23 %, the body weight, BW gain and feed conversion ratios (FCR) linearly improved (P less than 0.01) during 0 to 3 wk of age. From 4 to 8 wk of age, the body weight, feed intake, BW gain, FCR and uniformity were not different (P greater than 0.05). Carcass ratios of birds fed 3,000 kcal of ME/kg diets from 3 to 8 wk of age were quadratically increased significantly (P less than 0.01). As ME and CP increased, respectively, relative weight of liver weight per 100 g of BW was linearly decreased (P less than 0.01). Relative weights of left breast, thigh and drumstick weight per 100 of BW were not different (P greater than 0.05). Also, breast meat color, pH, cooking loss and shear force were not different (P greater than 0.05). Thus, diets with 2,800 kcal of ME/kg and 23% CP or with 2,900 kcal of ME/kg and 17% CP at 0 to 3 wk and 4 to 8 wk, respectively, were used more efficiently. However, diets with 3,000 kcal of ME/kg at 4 to 8 wk in carcass rate was quadratically increased.
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