Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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A regression for estimating metabolizable glucose in diets of weaned piglets for optimal growth performance

  • Lv, Liangkang (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Feng, Zhi (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Zhang, Dandan (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Lei, Long (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Zhang, Hui (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Liu, Zhengya (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Ren, Ying (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University) ;
  • Zhao, Shengjun (Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University)
  • Received : 2020.07.02
  • Accepted : 2020.12.08
  • Published : 2021.10.01
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Abstract

Objective: Two experiments were conducted to provide a new approach for evaluating feed nutritional value by metabolizable glucose (MG) in piglet diets with different levels of starch and crude fiber. In Exp 1, a regression equation for MG was generated. In Exp 2, the equation was verified, and the optimal growth performance of piglets under appropriate MG levels was tested. Methods: In Exp 1, 20 weaned piglets (7.74±0.81 kg body weight [BW]) were randomly assigned to 1 of 4 treatments, including the basal diet containing different levels of MG (starch, 25.80%, 31.67%, 45.71%, 49.36%; crude fiber, 1.23%, 1.35%, 1.80%, 1.51%). The piglets were implanted with an ileal fistula, cannulation of the carotid artery, portal vein, and mesenteric artery. The chyme from the ileum fistula and blood samples were collected. In Exp 2, 30 weaned piglets (8.96±0.50 kg BW) were randomly assigned to 1 of 5 treatments, including the experimental diets with different levels of MG (37.6, 132.5, 300.0, 354.3, and 412.5 g/kg). The piglets' BW, and feed consumption were recorded to calculate growth performance during the 28-d experiment. Results: In Exp 1, the MG levels in 4 diets were 239.62, 280.68, 400.79, and 454.35 g/kg. The regression equation for the MG levels and dietary nutrients was: Y (MG) = 12.13×X1 (starch)+23.18×X2 (crude fiber)-196.44 (R2 = 0.9989, p = 0.033). In Exp 2, treatments with 132.5 and 300.0 g/kg MG significantly (p<0.05) increased average daily gain and feed conversion efficiency of weaned piglets, increased digestibility of crude fat, and had no effect on digestibility of crude protein compared to 300.0 to 412.5 g/kg MG. Conclusion: The pig model combining the ileum fistula and cannulation of blood vessels was successfully used to determine the dietary MG levels. The recommended MG level in weaned pig diets is 132.5 to 300.0 g/kg.

Keywords

Acknowledgement

We wish to acknowledge the support of the technical staff of the Animal Care and Use Committee of Wuhan Polytechnic University in daily management. This work was financially supported by the National Natural Science Foundation of China (grant number 31201833 and 31872373) and the Open Project of Hubei Key Laboratory of Animal Nutrition and Feed Science (grant number 201904).

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