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<p>This study evaluated the effects of reduced-protein diets supplemented with only the first three limiting amino acids (AAs); methionine, lysine, and threonine, on broiler performance, profitability, and nitrogen (N) utilization. Two hundred Cobb-500 broiler chicks were assigned to four dietary treatments in a Completely Randomized Design: a control diet and three reduced crude protein (CP) diets (-1PP, -2PP, -3PP). Diets contained CP levels of 21%, 20%, 19%, 18% during grower (14–28d) and 19.5%, 18.5%, 17.5%, 16.5% during finisher (28–42d) phases. Broilers on up to 2% CP reduction exhibited similar (<i>P &lt; </i>0.05) or superior growth performance and feed conversion ratio compared to 3% CP reduction. Gross margin was highest (<i>P &lt; </i>0.05) with up to 2% CP reduction but declined with further reduction. Carcass traits and breast yield decreased (<i>P &lt; </i>0.05) with CP reduction, though meat quality was unaffected. N intake and retention decreased (<i>P &lt; </i>0.05), while excretion and other N utilization parameters were unchanged. Nutrient digestibility remained consistent, but apparent metabolizable energy increased (<i>P &lt; </i>0.05) as dietary CP decreased. These findings indicate that reducing dietary CP by up to 2%, supplemented with the first three limiting amino acids, maintains growth performance, profitability, and meat quality. This approach also reduces environmental N emissions and offers a cost-effective strategy for developing economies compared to reduced-protein diets with additional amino acid supplementation.</p>

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Implementing reduced-protein diets for broiler chickens in emerging economies: supplementation with only the first three limiting amino acids

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月31日

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  • Damilola U. Kareem,
  • Adeola V. Adegoke,
  • Adedoyin T. Amos,
  • Emmanuel A. Adeyeye,
  • Olubukola P. A. Idowu,
  • Lateefat M. Akande,
  • Quadri O. Abdulgafar,
  • Adebukola T. Orbugh,
  • Ayobami T. Aboderin,
  • Abimbola O. Oso,
  • Olusegun M. O. Idowu

摘要

This study evaluated the effects of reduced-protein diets supplemented with only the first three limiting amino acids (AAs); methionine, lysine, and threonine, on broiler performance, profitability, and nitrogen (N) utilization. Two hundred Cobb-500 broiler chicks were assigned to four dietary treatments in a Completely Randomized Design: a control diet and three reduced crude protein (CP) diets (-1PP, -2PP, -3PP). Diets contained CP levels of 21%, 20%, 19%, 18% during grower (14–28d) and 19.5%, 18.5%, 17.5%, 16.5% during finisher (28–42d) phases. Broilers on up to 2% CP reduction exhibited similar (P < 0.05) or superior growth performance and feed conversion ratio compared to 3% CP reduction. Gross margin was highest (P < 0.05) with up to 2% CP reduction but declined with further reduction. Carcass traits and breast yield decreased (P < 0.05) with CP reduction, though meat quality was unaffected. N intake and retention decreased (P < 0.05), while excretion and other N utilization parameters were unchanged. Nutrient digestibility remained consistent, but apparent metabolizable energy increased (P < 0.05) as dietary CP decreased. These findings indicate that reducing dietary CP by up to 2%, supplemented with the first three limiting amino acids, maintains growth performance, profitability, and meat quality. This approach also reduces environmental N emissions and offers a cost-effective strategy for developing economies compared to reduced-protein diets with additional amino acid supplementation.