Effect of Lysine to Digestible Energy Ratio on Growth Performance and Carcass Characteristics in Finishing Pigs

  • Cho, S.B. (National Institute of Animal Science, RDA) ;
  • Han, In-K. (Department of Food and Animal Biotechnology, Seoul National University) ;
  • Kim, Y.Y. (Department of Food and Animal Biotechnology, Seoul National University) ;
  • Park, S.K. (National Institute of Animal Science, RDA) ;
  • Hwang, O.H. (National Institute of Animal Science, RDA) ;
  • Choi, C.W. (Department of Animal Resrouces, Daegu University) ;
  • Yang, S.H. (National Institute of Animal Science, RDA) ;
  • Park, K.H. (National Institute of Animal Science, RDA) ;
  • Choi, D.Y. (National Institute of Animal Science, RDA) ;
  • Yoo, Y.H. (National Institute of Animal Science, RDA)
  • Received : 2012.06.07
  • Accepted : 2012.07.29
  • Published : 2012.11.01


This experiment was performed to investigate the effects of lysine (Lys) to DE ratio on growth performance, and carcass characterics in finishing barrows. Ninety six cross-bred finishing barrows ((Landrace${\times}$Yorkshire)${\times}$Duroc, average BW $58.25{\pm}0.48$ kg) were assigned as a randomized complete block design by 2 energy levels and 4 Lys:DE ratios on the basis of BW to one of 8 treatments with 3 replications with 4 animals per pen. The levels of DE and Lys:DE ratio for each treatment were i) DE 3.35 Mcal/kg, 1.5 g Lys/Mcal DE, ii) DE 3.35 Mcal/kg, 1.8 g Lys/Mcal DE, iii) DE 3.35 Mcal/kg, 2.1 g Lys/Mcal DE, iv) DE 3.35 Mcal/kg, 2.4 g Lys/Mcal DE, v) DE 3.60 Mcal/kg, 1.5 g Lys/Mcal DE, vi) DE 3.60 Mcal/kg, 1.8 g Lys/Mcal DE, vii) DE 3.60 Mcal/kg, 2.1 g Lys/Mcal DE, viii) DE 3.60 Mcal/kg, 2.4 g Lys/Mcal DE. During finishing period from 58 kg to 103 kg of BW, increased energy density in the diet increased (p<0.05) ADG and gain:feed ratio, but did not influence ADFI. As Lys:DE ratio was increased, ADG, ADFI and gain:feed ratio were improved in finishing barrows (p<0.05). There were positive interactions (p<0.05) between carcass weight, grade, and backfat thickness and energy density and Lys level (p<0.05). In conclusion, data from our current study suggest that maximum yields including ADG, gain:feed ratio, carcass weight and grade can be achieved by administrating finishing pigs with an ideal Lys:DE ratio, Lys 2.1 g/DE Mcal.


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