Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of dietary energy and crude protein levels on growth performance, blood profiles, and nutrient digestibility in weaning 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)
  • Received : 2018.04.17
  • Accepted : 2018.08.08
  • Published : 2019.04.01
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Abstract

Objective: This experiment was conducted to investigate the effect of reducing dietary metabolic energy (ME) and crude protein (CP) levels on growth performance, blood profiles, and nutrient digestibility in weaning pigs. Methods: A total of 240 crossbred pigs ($Duroc{\times}[Landrace{\times}Yorkshire]$) with an average body weight of $8.67{\pm}1.13kg$ were used for a 6-week feeding trial. Experimental pigs were allotted to a $2{\times}3$ factorial arrangement using a randomized complete block design. The first factor was two levels of dietary ME density (low ME level, 13.40 MJ/kg or high ME level, 13.82 MJ/kg) and the second factor was three dietary CP levels based on subdivision of early and late weaning phases (low CP level, 19.7%/16.9%; middle CP level, 21.7%/18.9%; or high CP level, 23.7%/20.9%). Results: Over the entire experimental period, there were no significant difference in body weight among groups, but a decrease in diet energy level was associated with an increase in average daily feed intake (p = 0.02) and decrease in gain-feed ratio (G:F) ratio (p<0.01). Decreased CP levels in the diet were associated with a linear increase in average daily gain (p<0.05) and quadratic increase in G:F ratio (p<0.05). In the early weaning period, blood urea nitrogen concentration tended to increase when ME in the diet decreased and decrease when CP level in the diet decreased (p = 0.09, p<0.01, respectively). Total protein concentration tended to increase when CP level was reduced (p = 0.08). In the late weaning period, blood urea nitrogen concentration decreased linearly as CP level decreased (p<0.01). The CP and crude fat digestibility decreased when ME was decreased by 0.42 MJ/kg (p = 0.05, p = 0.01, respectively). The CP digestibility increased linearly as CP level decreased (p = 0.01). Conclusion: A weaning pig diet containing high ME level (13.82 MJ/kg) and low CP level (19.7%/16.9%) can improve pig growth performance and nutrient digestibility.

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References

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