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Effects of Dietary Supplementation of Copper-soy Proteinate on the Performance of Laying Hens

Copper-soy Proteinate의 첨가가 채란계의 생산성에 미치는 영향

  • Lee, Mun-Ku (Department of Animal Science and Technology, Chung-Ang University) ;
  • Kim, Chan-Ho (Department of Animal Science and Technology, Chung-Ang University) ;
  • Shin, Dong-Hun (Department of Animal Science and Technology, Chung-Ang University) ;
  • Jung, Byoung-Yun (Department of Poultry Science, The University of Georgia) ;
  • Paik, In-Kee (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2011.04.18
  • Accepted : 2011.08.10
  • Published : 2011.09.30

Abstract

This study was conducted to investigate the effects of dietary supplementation of copper-soy proteinate (Cu-SP) on the performance of laying hens. A total of 1,000 Hy-Line Brown laying hens of 32 wks old were assigned to one of the following 5 dietary treatments: Control, Cu-SP 50, 100, 150, 200 (50, 100, 150, 200 ppm Cu supplementation as Cu-soy proteinate). Each treatment was replicated 4 times with fifty birds per replication, housed in 2 birds cages. Fifty birds units were arranged according to randomized block design. Feeding trial lasted 5 wks under 16L : 8D lighting regimen. There were no significant differences among treatments in hen-day and hen-house egg production, egg weight, broken & soft egg production. Feed intake and feed conversion rate (FCR) were significantly (P<0.01) lower in Cu-SP treated groups than Control. Eggshell thickness was significantly (P<0.01) higher in Control than Cu-SP 100, 150 and 200. Egg yolk color index was significantly (P<0.01) higher in Cu-SP 200 than other treatments. Egg shell color index was significantly (P<0.05) higher in Cu-SP 150 and Cu-SP 200 than Cu-SP 100. Concentration of copper, iron and zinc of the egg yolk were not significantly influenced by treatment. There were no significant differences in the level of leukocytes and erythrocytes in the chicken blood. The result of this experiment showed that dietary supplementation of Cu-SP at the level of 50ppm of Cu can reduce feed intake and FCR.

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