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Valine needs in starting and growing Cobb (500) broilers.

F C Tavernari1, G R Lelis, R A Vieira

  • 1Embrapa Swine and Poultry, Concórdia, SC, Brazil, 89700-000.

Poultry Science
|December 18, 2012
PubMed
Summary
This summary is machine-generated.

Determining the optimal valine-to-lysine ratio is crucial for broiler growth. This study found that higher ratios improved weight gain and feed conversion in Cobb × Cobb 500 broilers during starter and finisher phases.

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Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Avian Physiology

Background:

  • Optimizing amino acid ratios in broiler diets is essential for maximizing growth performance and feed efficiency.
  • Valine and lysine are critical essential amino acids that play vital roles in protein synthesis and overall broiler development.
  • Previous research indicates that the valine-to-lysine ratio can significantly impact broiler performance, but optimal levels may vary by age and breed.

Purpose of the Study:

  • To determine the optimal digestible valine-to-lysine ratio for male Cobb × Cobb 500 broilers during the starter (8-21 days) and finisher (30-43 days) phases.
  • To evaluate the impact of varying valine-to-lysine ratios on broiler weight gain, feed conversion ratio, feed intake, and carcass parameters.

Main Methods:

  • Two independent experiments utilizing a randomized block design with 7 dietary treatments and 8 replicates per treatment.
  • Diets were formulated with 93% of the recommended digestible lysine, with varying digestible valine levels to achieve different valine-to-lysine ratios.
  • Starter (25 birds/replicate) and finisher (20 birds/replicate) broilers were fed experimental diets, and performance parameters were measured.

Main Results:

  • Dietary treatments did not significantly affect feed intake or carcass parameters in either the starter or finisher phases.
  • A quadratic effect was observed for weight gain and feed conversion ratio in both phases.
  • Broilers fed diets with lower valine-to-lysine ratios exhibited poorer performance compared to controls. Higher ratios improved weight gain by 5.5% in the starter phase and 7-8% in the finisher phase.

Conclusions:

  • The optimal digestible valine-to-lysine ratio for Cobb × Cobb 500 broilers in the starter phase (8-21 days) is 77%.
  • For the finisher phase (30-43 days), a digestible valine-to-lysine ratio of 76% is recommended for optimal broiler performance.
  • Maintaining appropriate valine-to-lysine ratios is critical for enhancing broiler growth and feed efficiency.