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Stunting syndrome in broilers: physical, physiological, and behavioral aspects

F Shapiro1, I Nir

  • 1Hebrew University of Jerusalem, Faculty of Agriculture, Department of Animal Science, Rehovot, Israel.

Poultry Science
|January 1, 1995
PubMed
Summary
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Stunting syndrome (SS) in broilers negatively impacts growth and feed efficiency, with effects diminishing as birds age. Inoculated chicks exhibit altered eating behavior and metabolic changes, suggesting SS affects digestion and metabolism.

Area of Science:

  • Animal Science
  • Veterinary Medicine
  • Poultry Science

Background:

  • Stunting syndrome (SS) is a significant concern in broiler production, affecting growth and feed utilization.
  • Understanding the impact of SS at different ages and its transmission is crucial for effective management.

Purpose of the Study:

  • To investigate the effects of stunting syndrome (SS) on young broilers at various inoculation ages.
  • To analyze the impact of SS on growth, feed intake, feed utilization, eating behavior, and pancreatic enzyme activities.
  • To evaluate the consequences of horizontal transmission of SS in broiler chickens.

Main Methods:

  • Two experiments were conducted involving oral inoculation of broiler chicks with intestinal contents from SS-affected birds.
  • Growth, feed intake, and feed utilization were measured.

Related Experiment Videos

  • Eating behavior was assessed by observing pecking activity.
  • Pancreatic digestive enzyme activities (amylase, trypsin, chymotrypsin, lipase) were analyzed at different time points post-inoculation.
  • Effects of horizontal transmission were also studied.

    • Main Results:

    • Inoculation with SS inoculum resulted in depressed growth, feed intake, and feed utilization, with effects being most severe when administered at posthatch and decreasing with age.
    • Eating activity (pecking) was significantly higher in inoculated chicks compared to controls, and this hyperactivity was also negatively related to inoculation age.
    • Horizontal transmission of SS led to similar performance depressions as direct inoculation but showed different patterns in pancreatic enzyme activities.
    • Pancreatic enzyme activities varied with age, initially lower in inoculated birds and later higher, except for lipase which remained lower in inoculated birds.

    Conclusions:

    • The age of inoculation significantly influences the severity of stunting syndrome in broilers.
    • Stunting syndrome affects not only digestion but also metabolism, as indicated by altered eating behavior and pancreatic enzyme profiles.
    • Horizontal transmission can spread SS, causing performance losses and metabolic disturbances in broiler flocks.