Journal of Animal Science and Technology

  • 제61권4호
  • /
  • Pages.204-215
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  • 2019
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  • 2672-0191(pISSN)
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  • 2055-0391(eISSN)
한국축산학회 (Korean Society of Animal Sciences and Technology)
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Effects of dietary energy and crude protein levels on growth performance, blood profiles, and carcass traits in growing-finishing pigs

  • Fang, Lin Hu (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Jin, Ying Hai (Department of Animal Science, Yanbian University) ;
  • Do, Sung Ho (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Hong, Jin Su (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Byung Ock (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Han, Tae Hee (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Yoo Yong (School of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, Seoul National University)
  • 투고 : 2019.05.14
  • 심사 : 2019.06.11
  • 발행 : 2019.07.31
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초록

This experiment was conducted to evaluate the effect of dietary energy and crude protein (CP) levels on growth performance, blood profiles, and carcass traits in growing-finishing pigs. A total of 180 crossbred pigs ([Yorkshire ${\times}$ Landrace] ${\times}$ Duroc) with an average body weight of $30.96{\pm}3.068kg$ were used for a 12-week feeding trial. Experimental pigs were allotted to a $2{\times}3$ factorial arrangement using a randomized complete block (RCB) design. The first factor was two levels of dietary metabolizable energy (ME) density (13.40 MJ/kg or 13.82 MJ/kg), and the second factor was three dietary CP levels based on subdivision of growing-finishing phases (high: 18%/16.3%/16.3%/13.2% middle: 17%/15.3%/15.3%/12.2% and low: 16%/14.3%/14.3%/11.2%). Average daily gain (ADG) and gain-feed ratio (G:F ratio) decreased as dietary CP level was decreased linearly (linear, p < 0.05; p < 0.05, respectively) in the early growing period, and G:F ration also decreased as dietary CP level was decreased linearly (linearly, p < 0.05) over the whole growing phase. Over the entire experimental period, G:F ratio decreased as dietary ME level decreased (p = 0.01). Blood urea nitrogen (BUN) concentration was increased as dietary energy level decreased in growing period (p < 0.01). During finishing period, total protein concentration was decreased by lower dietary energy level (p < 0.05). In this study, there were no significant differences in proximate factors, physiochemical properties, muscle TBARS assay results, pH changes, or color of pork by dietary treatments. However, saturated fatty acid (SFA) increased (p < 0.01) and polyunsaturated fatty acid (PUFA) decreased (p < 0.05) when ME was decreased by 0.42 MJ/kg in growing-finishing pig diets. In addition, monounsaturated fatty acid (MUFA) tended to increase when CP level was decreased in growing-finishing pig diets (p = 0.06). A growing-finishing diet of 13.82 MJ/kg diet of ME with the high CP level can improve growth performance and show better fatty acids composition of pork.

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