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Effects of dietary supplementation with detoxified Rhus verniciflua sap on egg production, yolk lipid and intestinal microflora in laying hens

  • An, Byoung-Ki (Laboratory of Poultry Science, Department of Animal Science and Technology, Konkuk University) ;
  • Kim, Je-Hun (Laboratory of Poultry Science, Department of Animal Science and Technology, Konkuk University) ;
  • Zheng, Lan (Laboratory of Poultry Science, Department of Animal Science and Technology, Konkuk University) ;
  • Moon, Byung-Hern (Celltech, Co., Ltd.) ;
  • Lee, Kyung-Woo (Laboratory of Poultry Science, Department of Animal Science and Technology, Konkuk University)
  • Received : 2017.02.27
  • Accepted : 2017.05.08
  • Published : 2018.01.01

Abstract

Objective: This study was conducted to investigate the effects of dietary detoxified Rhus verniciflua sap (RVS) on production performance, egg quality, lipid fractions of egg yolk, liver and serum, and the profile of cecal microflora in laying hens. Methods: Two hundred 52-week-old Hy-Line Brown layers were randomly divided into 4 groups with 5 replicates per group (2 hens per cage, 5 cages per replicate) and were provided with one of 4 experimental diets containing 0%, 0.05%, 0.1%, or 0.2% RVS, for 6 weeks. Due to unequal intervals of RVS doses, the interactive matrix language procedure of the SAS program was used to correct the contrast coefficients of orthogonal polynomials. Results: There were no differences in feed intake and egg weight among the groups. Egg production increased (linearly and quadratically, p<0.05) with increasing levels of RVS. Eggshell thickness increased (linear, p<0.05) as the level of RVS in diets increased. The levels of blood cholesterol and activities of glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase were not altered by dietary treatments. Increasing level of RVS increased (linear, p<0.05) the populations of cecal lactic acid bacteria. The content of yolk cholesterol decreased (linear, p<0.05) with increasing levels of dietary RVS, although there were no significant differences in each lipid fraction of the liver. Conclusion: This study indicates that dietary RVS could improve laying performance and eggshell quality, and affect cecal lactic acid bacteria in a dose-dependent manner.

Keywords

References

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Cited by

  1. Egg Quality Parameters, Production Performance and Immunity of Laying Hens Supplemented with Plant Extracts vol.11, pp.4, 2018, https://doi.org/10.3390/ani11040975