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Animals
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Amino Acid Nutrition in Poultry: 2nd Edition
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Amino Acid Nutrition in Poultry: 2nd Edition

A special issue of Animals (ISSN 2076-2615). This special issue belongs to the section "Poultry".

Deadline for manuscript submissions: 31 July 2025 | Viewed by 539

Special Issue Editor

Dr. Csaba Szabó

E-Mail Website
Guest Editor
Department of Animal Nutrition and Physiology, Faculty of Agriculture and Food Sciences and Environmental Management, University of Debrecen, Böszörményi Street 138, 4032 Debrecen, Hungary
Interests: pigs; poultry; horses; amino acids; antioxidants; calcium metabolism
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The application of amino acids in poultry diets has a history that reaches back more than 70 years. Currently, amino acids not only refer to the building blocks of proteins, but also, our knowledge of their effects on biochemical processes are increasing. As we can see from the publications in the first part of this Special Issue, amino acids are already playing a role during embryo development and can affect physiological processes post-hatch through nutrient-sensing pathways. We received manuscripts dealing with various amino acid requirements of layers and broilers which show that some knowledge is still lacking, especially about influencing factors. As we can see, not only pure amino acids, but also dipeptides can be effective in improving performance.

With the initiation of the second edition of this Special Issue, our aim is to gather more research in the field of amino acid nutrition (including dipeptides) of all types of poultry and provide insights into the current directions of research. We invite researchers to submit original research papers or reviews that address the effects of amino acids on the performance and metabolism of poultry. Topics may include poultry performance, quality of animal products, metabolism, and in ovo feeding and its long-term effects.

Dr. Csaba Szabó
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Animals is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • poultry
  • amino acid
  • requirement
  • performance
  • quality
  • immune status
  • antioxidant status
  • intestinal morphology
  • in ovo

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Related Special Issue

Published Papers (3 papers)

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Research

23 pages, 276 KiB  
Article
Effects of Reduced Amino Acids and Apparent Metabolizable Energy on Meat Processing, Internal Organ Development, and Economic Returns of Cobb 700 and Ross 708 Broilers
by Bo Zhang, Shengyu Zhou, Wei Zhai and Yang Zhao
Animals 2025, 15(7), 1064; https://doi.org/10.3390/ani15071064 - 6 Apr 2025
Viewed by 84
Abstract
The rapid growth and high nutrient density in modern broiler production have led to issues like woody breast myopathy (WBM), footpad dermatitis, and fat accumulation, affecting welfare and profitability. This study evaluated the effects of amino acid (AA) and apparent metabolizable energy (AME) [...] Read more.
The rapid growth and high nutrient density in modern broiler production have led to issues like woody breast myopathy (WBM), footpad dermatitis, and fat accumulation, affecting welfare and profitability. This study evaluated the effects of amino acid (AA) and apparent metabolizable energy (AME) reductions on organ development, carcass yield, WBM incidence, and economic returns in Cobb 700 and Ross 708 broilers. Two trials were conducted, one per strain, using a factorial design with 12 treatments (four AA × three AME). Each trial included 864 broilers, randomly assigned to six replicate blocks, with 12 pens per block (six males and six females per pen). Diets contained 70%, 80%, 90%, or 100% of digestible AA and 84%, 92%, or 100% AME based on breeder recommendations. A 30% AA reduction increased fat pad weight, promoted proventriculus and jejunum development (day 58), reduced carcass and tenderloin weights, lowered moderate/severe WBM incidence (day 47), and shortened footpad dermatitis. A 16% AME reduction decreased fat pad weight, improved muscle production and returns, but reduced normal breast percentage (days 40 and 47). The recommended protein–energy ratio (g/MJ) for optimal economic returns was as follows: 19.78 (0–10 d), 17.51 (11–24 d), 16.03 (25–39 d), and 15.25 (40–63 d). Full article
(This article belongs to the Special Issue Amino Acid Nutrition in Poultry: 2nd Edition)
19 pages, 2676 KiB  
Article
Reduced Dietary Protein and Essential Amino Acids Impair Growth Performance and Increase Lysine Sensitivity in Broiler Chickens
by Paloma Cordero, Galia Ramírez-Toloza, Pablo Dufflocq, Sofía Herrera-Alcaíno and Sergio A. Guzmán-Pino
Animals 2025, 15(7), 1027; https://doi.org/10.3390/ani15071027 - 2 Apr 2025
Viewed by 105
Abstract
Nutrition plays a fundamental role in poultry production. Developing high-quality diets that ensure positive feed perception by birds is a key strategy for enhancing production performance within the industry. This study evaluated the effect of crude protein (CP) and four essential amino acid [...] Read more.
Nutrition plays a fundamental role in poultry production. Developing high-quality diets that ensure positive feed perception by birds is a key strategy for enhancing production performance within the industry. This study evaluated the effect of crude protein (CP) and four essential amino acid (AA) reductions on broiler chickens’ growth performance and taste sensitivity for Lysine, Methionine, Threonine, and Tryptophan. Sixty-four one-day-old male broiler chickens (Ross 308) were exposed to four dietary treatments consisting of a balanced (control) diet with a total inclusion of CP and Lysine, Methionine, Threonine, and Tryptophan (T1); diets with a 30 g/kg reduction in CP maintaining 100% exogenous incorporation of the four aforementioned AAs (T2); diets with a 30 g/kg reduction in CP and 50% exogenous incorporation of the same four AAs (T3); and diets with a 30 g/kg reduction in CP with no exogenous incorporation of the four previously mentioned AAs (T4). After 7 days of acclimatization to the diets, the birds were offered Lysine, Methionine, Threonine, and Tryptophan at eight concentrations (0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5%) each for 4 h/day in a double-choice test for 32 days to determine the preferences and sensory-motivated intake (SMI) of the birds. During the 39-day trial, the birds in the T4 group showed a lower (p < 0.050) average daily feed intake (ADFI), average daily gain (ADG), feed conversion ratio (FCR), and body weight (BW) than the birds of the rest of the treatments. No significant effects of the different dietary treatments, CP content, or AA levels were observed on the preferences or SMI of the birds (p > 0.050). However, differences were found in the preferences and SMI between birds from the different treatments when evaluating the treatment × AA × concentration interaction (p < 0.050), reflecting that dietary treatments generate changes in the consumption behavior of birds in response to the delivery of AAs at different concentrations. The preference and SMI thresholds for Lysine decreased in the birds in the T4 group, while the thresholds for Methionine and Tryptophan increased compared to the birds in the control group (p < 0.050). We concluded that the reduction in CP and AAs in the diet of broiler chickens affects their productive parameters and increases their taste sensitivity, which was reflected in lower weight gain and feed conversion efficiency, along with increased preferences and higher SMI values in the birds exposed to diets with more significant nutritional deficits. Full article
(This article belongs to the Special Issue Amino Acid Nutrition in Poultry: 2nd Edition)
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21 pages, 246 KiB  
Article
Effect of Reduction in Dietary Amino Acids and Energy on Growth Performance and Economic Return of Cobb 700 and Ross 708 Broilers
by Bo Zhang, Shengyu Zhou, Wei Zhai and Yang Zhao
Animals 2025, 15(6), 890; https://doi.org/10.3390/ani15060890 - 20 Mar 2025
Viewed by 181
Abstract
This study examined how reducing dietary amino acids (AAs) and apparent metabolizable energy (AME) affects broiler growth and economic return. Two trials were conducted with Cobb 700 and Ross 708 broilers using a randomized design with 12 diet treatments. A 30% AA reduction, [...] Read more.
This study examined how reducing dietary amino acids (AAs) and apparent metabolizable energy (AME) affects broiler growth and economic return. Two trials were conducted with Cobb 700 and Ross 708 broilers using a randomized design with 12 diet treatments. A 30% AA reduction, compared to the high breeder recommendations for Cobb 700 and Ross 708 strains, reduced body weight in Cobb 700 broilers before 41 days and in Ross 708 broilers at 64 days, while feed efficiency declined in both strains from 0 to 41 days. A 16% AME reduction increased feed intake and worsened feed efficiency in Cobb 700 broilers before 41 days and in Ross 708 broilers from 55 to 64 days. At 55 days, reducing AAs by 20–30% or AME by 8–16% decreased feed cost per kilogram of body weight and improved economic return. However, a 30% AA reduction reduced overall profitability per bird in Cobb 700 broilers at 41 days, while a 16% AME reduction did not. In conclusion, both 30% AA and 16% AME reductions impaired growth, but only excessive AA reduction negatively affected profitability. These findings help optimize feeding strategies for cost-effective broiler production. Full article
(This article belongs to the Special Issue Amino Acid Nutrition in Poultry: 2nd Edition)
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