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Nutrient use in chicks during the first week posthatch.

Y Noy1, D Sklan

  • 1Faculty of Agriculture, Hebrew University, Rehovot, Israel.

Poultry Science
|March 21, 2002
PubMed
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Early broiler chick nutrition impacts performance, but effects diminish as birds mature. Providing adequate protein and energy is key for immediate posthatch growth, with macronutrient levels having limited long-term influence.

Area of Science:

  • Animal Science
  • Poultry Nutrition
  • Broiler Production

Background:

  • Early posthatch nutrition is critical for broiler development.
  • Macronutrient levels (protein, fat, cellulose) can influence chick performance.
  • Understanding these effects is vital for optimizing broiler feed formulations.

Purpose of the Study:

  • To investigate the impact of varying dietary macronutrient levels on broiler chick performance during the first week posthatch.
  • To compare the effects of early-life nutrition on broiler growth and carcass composition over time.

Main Methods:

  • Four experiments utilized male Ross x Ross broiler chicks.
  • Factorial designs examined effects of different protein, fat, and cellulose levels.
  • Performance metrics (feed intake, body weight, feed efficiency) were measured at various time points.

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Main Results:

  • Increasing protein and fat levels generally decreased feed intake and body weight in the short term.
  • High cellulose levels reduced feed intake and body weight.
  • While initial differences were observed at 7 days, they became insignificant by 18 days and beyond.
  • Carcass fat and protein percentages were not affected by dietary treatments.

Conclusions:

  • Dietary macronutrient composition significantly impacts broiler chicks in the first week posthatch.
  • These early nutritional effects are transient, with limited long-term influence on growth and development.
  • Ensuring adequate essential amino acids and energy appears to be the primary driver of immediate posthatch growth.