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http://dx.doi.org/10.5536/KJPS.2012.39.2.087

Effects of Varying Levels of Dietary Metabolizable Energy and Crude Protein on Growth Performance and Carcass Characteristics in Layer-type Growing Male Chicks  

Yun, Jeong-Geun (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Kim, Hong-Rae (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Oh, Sung-Taek (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Zheng, Lan (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Choi, Young-In (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Choo, Yun-Kyung (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
An, Byoung-Ki (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Lee, Sung-Ki (Department of Animal Products and Food Science, Kangwon National University)
Kang, Chang-Won (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
Publication Information
Korean Journal of Poultry Science / v.39, no.2, 2012 , pp. 87-95 More about this Journal
Abstract
This experiment was conducted to investigate the effects of varying levels of metabolizable energy (ME) and crude protein (CP) on growth performance and carcass characteristics in layer-type growing male chicks. Nine hundred 1-d-old Hy-Line Brown male chicks were randomly allocated to 30 pens in a $2{\times}3$ factorial design. The experimental diets contained 2 levels of ME (2,800 kcal/kg and 2,950 kcal/kg) in combination with 3 levels of CP (17%, 18.5%, and, 20%). A significant interaction of ME and CP on feed intake was observed (p<0.05). No interaction was observed between ME and CP for 53 d BW gain or FCR, which improved linearly with dietary CP levels (p<0.05). A significant interaction or tendency was observed between ME and CP levels. The intake of ME for 1 g BW gain was linearly decreased with increasing CP levels (p<0.001). The intake of CP per bird was significantly increased in low ME (2,800 kcal/kg) treatment than that of the high ME treatment (2,950 kcal/kg) (p<0.05), and dietary CP level had more influence on CP intake for gram BW gain than level of ME. The relative weights of liver, spleen, breast meat and, leg were not influenced by the dietary treatments. Serum BUN, albumin, creatinine, and the activities of GOT and GPT were not influenced significantly by the diet treatment. In conclusion, the growth performance in layer-type male chicks was linearly increased when the level of dietary CP increased. The ME and CP did not affect the carcass characteristics and blood profiles. Therefore, the optimum levels of dietary ME and CP to improve the growth were 2,800 kcal/kg and above 18.5% in layer-type growing male chicks, respectively.
Keywords
metabolizable energy; crude protein; growing performance; protein intake; laying-type male chicks;
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