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Feed habituation alleviates decreased feed intake after feed replacement in broilers.

C Chen1, H Wang1, H Jiao1

  • 1Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian City, Shandong Province, 271018, China.

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Switching broiler chickens from mash to pellet feed temporarily reduces feed intake. However, gradual habituation to pellet feed mitigates these negative effects on appetite and feed consumption.

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Area of Science:

  • Animal Nutrition and Physiology
  • Molecular Biology in Poultry

Background:

  • Dietary form (mash vs. pellet) influences feed intake and nutrient utilization in poultry.
  • Gene expression in the hypothalamus and gastrointestinal tract (GT) plays a crucial role in regulating appetite.

Purpose of the Study:

  • To investigate the impact of replacing mash diet with pellet diet on appetite-related gene expression.
  • To assess the role of feed habituation in mitigating negative effects of diet form change on feed consumption.

Main Methods:

  • Experiment 1: Compared mash diet vs. pellet diet in 21-day-old chicks.
  • Experiment 2: Introduced pellet feed gradually (mash-pellet mix) before full pellet diet transition.
  • Analyzed gene expression (e.g., CCK, ghrelin, CRH, MCR-4) in hypothalamus and jejunum.

Main Results:

  • Pellet diet significantly decreased feed consumption compared to mash diet.
  • Pellet diet upregulated cholecystokinin (CCK) mRNA in the jejunum.
  • Appetite-regulating genes (ghrelin, CRH, MCR-4) were downregulated in the hypothalamus following pellet diet transition.

Conclusions:

  • Dietary form change affects appetite-regulating gene expression in the hypothalamus and GT.
  • Pellet diet transition causes a transient reduction in broiler feed intake.
  • Feed habituation effectively alleviates the adverse effects of switching from mash to pellet diets.