Effect of dietary β-mannanase on productive performance, egg quality, and utilization of dietary energy and nutrients in aged laying hens raised under hot climatic conditions

  • Kim, Moon Chan (Department of Animal Science and Technology, Chung-Ang University) ;
  • Kim, Jong Hyuk (Department of Animal Science and Technology, Chung-Ang University) ;
  • Pitargue, Franco Martinez (Department of Animal Science and Technology, Chung-Ang University) ;
  • Koo, Do Yoon (Department of Animal Science and Technology, Chung-Ang University) ;
  • Choi, Hyeon Seok (Department of Animal Science and Technology, Chung-Ang University) ;
  • Kil, Dong Yong (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2017.04.09
  • Accepted : 2017.06.08
  • Published : 2017.10.01


Objective: The objective of this experiment was to investigate the effect of dietary ${\beta}-mannanase$ on productive performance, egg quality, and utilization of dietary energy and nutrients in aged laying hens raised under hot climatic conditions. Methods: A total of 320 84-wk-old Hy-line Brown aged laying hens were allotted to one of four treatments with eight replicates in a completely randomized design. Two dietary treatments with high energy (HE; 2,800 kcal/kg nitrogen-corrected apparent metabolizable energy [$AME_n$]) and low energy (LE; 2,700 kcal/kg $AME_n$) were formulated. Two additional diets were prepared by adding 0.04% (MN4) or 0.08% ${\beta}-mannanase$ (MN8) to LE treatment diets. The feeding trial was conducted for 28 d, covering a period from July to August in South Korea. The average daily room temperature and relative humidity were $29.2^{\circ}C$ and 83%, respectively. Results: Productive performance, egg quality, and cloacal temperature were not influenced by dietary treatments. The measured $AME_n$ values for MN8 diets were similar to those for HE diets, which were greater (p<0.05) than those for LE and MN4 diets. However, the $AME_n$ values for MN8 diets did not differ from those for LE and MN4 diets. Conclusion: The addition of ${\beta}-mannanase$ to low energy diets increases energy values for diets fed to aged laying hens. However, this increase has little positive impacts on performance and egg quality. These results indicate that dietary ${\beta}-mannanase$ does not mitigate the heat stress of aged laying hens raised under hot climatic conditions.


Supported by : National Research Foundation of Korea (NRF), Chung-Ang University


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