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Effects of inclusion level and adaptation period on nutrient digestibility and digestible energy of wheat bran in growing-finishing pigs

  • Zhao, Jinbiao (State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Zhang, Shuai (State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Xie, Fei (State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Li, Defa (State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University) ;
  • Huang, Chengfei (State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University)
  • 투고 : 2017.04.11
  • 심사 : 2017.06.08
  • 발행 : 2018.01.01

초록

Objective: This experiment was to evaluate the effect of different inclusion levels and adaptation periods on digestible energy (DE) and the apparent total tract digestibility (ATTD) of chemical constituents in diets supplemented with wheat bran. Methods: Thirty-six crossbred barrows with an initial body weight of $85.0{\pm}2.1kg$ were allotted to 6 diets in a completely randomized block design with 6 pigs per diet. Diets included a cornsoybean basal diet and 5 additional diets which were formulated by replacing corn and soybean meal in control diet with 15%, 25%, 35%, 45%, or 55% wheat bran. The experiment lasted for 34 d, and feces were collected from d 8 to 13, 15 to 20, 22 to 27, and 29 to 34 respectively. Results: The results showed no interaction effects between inclusion level and adaptation period on the concentration of DE and the ATTD of gross energy (GE) and crude protein (CP) in wheat bran. The DE value and ATTD of GE in wheat bran decreased (p<0.05) significantly as the inclusion level of wheat bran increased, but no difference in the ATTD of CP was observed. The ATTD of CP in wheat bran increased (p<0.10) significantly as the adaptation period for pigs was prolonged. In addition, the concentration of DE and the ATTD of GE in wheat bran decreased linearly (p<0.05) when pigs were fed either an increased level of wheat bran or given an increased adaptation period to the diets. Conclusion: Wheat bran showed a negative effect on the concentration of DE and ATTD of GE and CP as the inclusion level increased. A longer adaptation period can gradually increase the DE value and ATTD of GE and CP in wheat bran, and at least 14 to 21 d of adaptation might be recommended for growing-finishing pigs fed the high-fiber diets with wheat bran.

키워드

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