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Open research questions in Animal Nutrition and Physiology

86 unresolved questions extracted from the limitations and future-work sections of 987 Animal Nutrition and Physiology papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • doi:10.1080/01926230701595300 Kim, G. B., Y. M. Seo, C. H. Kim, and I. K. Paik. 2011. Effect of dietary prebiotic supplementation on the performance, immune response of broilers. Poultry Science 90 (1): 75– 82.

    Probiotic supplementation on the morphometric response of broiler digestive organs · 2026 · DOI

  • Future research could explore how modulating 706 glutamine availability or related metabolic pathways may optimize PGC culture 707 conditions and improve strategies for poultry germline preservation.

    Integrated Metabolomic and Transcriptomic Analyses Reveal that Glutamine Promotes Chicken PGCLC Specification Potentially through α-Ketoglutarate · 2026 · DOI

  • The role of CD4 t cells in the control of viral infections: recent advances and open questions. Role of CD4+ T cells in the control of viral infections: recent advances and open questions.

    Mechanistic insights into probiotic modulation of the gut–immune axis and their role as sustainable antibiotic alternatives in poultry production: An integrative review · 2026 · DOI

  • While OA is known to regulate nitrogen metabolism and ammonia (NH 3 ) detoxification more effectively than its individual components in clinical settings, their specific effects and mechanisms in broiler chickens remain unexplored.

    L-Ornithine-L-aspartate enhances growth performance and nitrogen metabolism via modulation of intestinal amino acid transporters and microbiota in broilers · 2026 · DOI

  • While these feed additives are specifically designed to degrade NSPs and enhance SBM protein digestibility, only scarce information is available on their impact on intestinal health.

    Impact of soybean meal enzymatic treatment on chicken caecal microbiota and intestinal epithelial cells · 2026 · DOI

  • This scientometric analysis offers a comprehensive overview of research on lighting technologies and photoperiod effects on broiler performance and meat quality; however, several methodological considerations should be noted. The study relies exclusively on the Web of Science Core Collection, which, although extensive and well-curated, may omit relevant publications from other databases such as Scopus, Dimensions, or regional repositories. Additionally, the results are sensitive to keyword selection and Boolean search strategies, meaning minor variations could influence the identification of thematic clusters or emerging trends. While scientometric methods effectively reveal patterns in the published literature, they do not directly measure experimental outcomes or causal relationships, limiting the ability to draw definitive practical conclusions solely from publication trends. Moreover, the exclusion of non-English and non-indexed literature may underrepresent contributions from certain regions, potentially affecting the global generalizability of the findings. Despite these limitations, the study provides a valuable framework for understanding historical trends and emerging directions, offering guidance for future research and practical applications in poultry production systems.

    SCIENTOMETRIC MAPPING OF RESEARCH CONCERNING THE IMPACT OF SOME TECHNOLOGIES IN THE POULTRY INDUSTRY ON THE NUTRITIONAL QUALITY OF MEAT. CASE STUDY: LIGHT SOURCES AND PHOTOPERIOD IN BROILER PRODUCTION · 2026 · DOI

  • However, as 2500 U/ kg was the maximum xylanase inclusion level evaluated, it remains uncertain whether higher doses could yield additional benefits, although the use of higher enzyme doses may not be economically sustainable.

    Energy and nutrient utilisation of laying hens fed fibre rich diet containing graded levels of supplementary fungal xylanase · 2026 · DOI

  • Despite increasing attention to broiler welfare, there is still limited information comparing physiological stress responses between fast-growing (FG) and slow-growing (SG) genotypes under evolving production conditions.

    Research note: A longitudinal evaluation of feather corticosterone in two broiler genotypes in a pasture-based system · 2026 · DOI

  • Another key limitation is the absence of well-defined dose–response relationships, as optimal inclusion levels for consistent biological and responses have not yet been clearly productive compositional Future Research Priorities: Future research should focus on generating a deeper mechanistic and application- oriented understanding of postbiotics and their synergistic use with non-nutritive feed additives. In addition, microbiome engineering strategies, including targeted modulation of microbial communities and metabolic pathways, should be explored to enhance functional stability and resilience of the gut ecosystem.

    Synergistic Effects of Postbiotics and Non-Nutritive Feed Additives on Poultry Immune Modulation and Gut Microbiome Stability · 2026 · DOI

  • Future research should focus on isolating the active components of JBGC and assessing its long-term effects to fully realize its potential as an antibiotic alternative in sustainable poultry production.

    Yeast culture derived from Jiang-flavor Baijiu distiller's grains enhances immune function and gut health in geese · 2026 · DOI

  • using purified components are needed. Third, analyses were immune organs (e.g., confined to blood, spleen, bursa of Fabricius) and their cytokine secretion patterns JBGC precluded definitive components to individual functional peptides); liver, and intestine; the were not examined, immune regulation.

    Yeast culture derived from Jiang-flavor Baijiu distiller's grains enhances immune function and gut health in geese · 2026 · DOI

  • Understanding of host-microbiome interactions directly influencing nutrient utilization and feed efficiency in poultry under diverse production environments remains mechanistically unclear. Targeted nutritional and microbial interventions to consistently improve feed efficiency require deeper knowledge of how microbiota composition and function vary across different management systems and their specific interactions with genetics and diet.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Research on poultry feed efficiency and animal welfare operates in separate domains without empirical evidence linking specific nutritional and genetic feed efficiency interventions to behavioral, physiological, and long-term health indicators of welfare in fast-growing genotypes. Holistic approaches integrating feed efficiency metrics (FCR, RFI, nutrient retention efficiency) with welfare assessments including locomotion, metabolic health, and stress resilience are underdeveloped.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Alternative feed ingredients such as insect meals, algae, and agro-industrial by-products are predominantly evaluated over short experimental periods under controlled conditions, with limited long-term, system-level evaluations within full commercial poultry production cycles. Standardized processing methods, digestibility modeling accounting for anti-nutritional factors, and economic assessments determining scalable sustainability potential of these ingredients for feed efficiency improvement are lacking.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Precision feeding and digital technologies for poultry remain largely at experimental or pilot stages with limited independent validation of long-term impacts on feed efficiency, cost effectiveness, and environmental outcomes at commercial scale. Most studies focus on technological performance rather than biological responses, leaving a gap in understanding avian physiological adaptation to dynamic feeding systems and integration with artificial intelligence-driven feeding models.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Comprehensive life cycle assessments of poultry feed efficiency improvements lack sufficient biological resolution to account for differences driven by nutrition, genetics, and management practices. Integrated modeling approaches combining feed efficiency data, LCA, economic analyses, and welfare outcomes to quantify system-level trade-offs and synergies among productivity, environmental sustainability, and animal welfare remain undeveloped.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Feed efficiency strategies in poultry have been predominantly evaluated under thermoneutral conditions, creating a critical gap in understanding how nutritional, genetic, and management interventions perform under climate stress, particularly heat stress in arid and tropical production systems. Long-term interaction data between heat stress, genetics, diet composition, gut health, and management practices influencing feed efficiency is limited.

    Mastering feed efficiency for a sustainable operation in poultry industry · 2026 · DOI

  • Dose-response relationships between inclusion rates of seaweed-derived mineral additives and broiler internal organ morphology (organ weight ratios, tissue composition) have not been quantified, preventing evidence-based recommendation of optimal supplementation levels for practical farm applications.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • No standardized protocols exist for assessing microbial contamination, mycotoxin presence, and heavy metal accumulation specifically in fermented agro-industrial feed additives used for broiler chickens, creating ambiguity about safety thresholds for distillers grains, spent grain, and grain bran preparations.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • The mechanistic pathways by which plant extract-based feed additives (Ocimum sanctum and Silybum marianum) modulate broiler organ development remain uncharacterized at the biochemical and gene expression levels, limiting understanding of whether effects on liver, kidney, and intestinal tissues are direct or secondary to growth performance changes.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • Comparative life cycle assessment and environmental impact data are lacking for different bioconversion pathways that upcycle agro-industrial waste into broiler feed additives, preventing quantitative evaluation of sustainability claims across distillery byproducts, brewery waste, and fermented crop residues.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • The optimal inclusion levels and nutrient composition ratios of corn bran, brewer's spent grain, and dried grain distillers with solubles have not been comparatively tested in mixed-additive formulations to assess synergistic or antagonistic effects on intestinal morphology and nutrient digestibility in broiler starter diets.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • Long-term safety and bioaccumulation profiles of feed additives derived from fermented agricultural byproducts (particularly those from alcohol and brewing industries) have not been established for broiler chickens raised beyond the standard 42-day production cycle, limiting understanding of residual contamination risks in meat products.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • The referenced studies on agro-industrial waste feed additives (corn dried distillers grains, brewer's spent grain, corn fermented protein) have not been systematically compared for their differential effects on broiler chicken organ development across multiple developmental stages (starter, grower, finisher phases) using standardized histomorphological measurements.

    FEED ADDITIVES FROM AGRO-INDUSTRIAL WASTE AND THEIR EFFECT ON BROILER CHICKENS INTERNAL ORGANS DEVELOPMENT · 2026 · DOI

  • The SP sample (pectin without AgNPs) showed only average efficiency with a yolk index of 36.02 after 28 days, but the coating composition, thickness, and application parameters for this control treatment are not specified. Optimization of the pectin coating formulation itself independent of nanoparticle concentration requires systematic investigation.

    Effect of Silver Nanoparticles Synthesized using Orange Peel Essential Oil on the Quality of Chicken Eggs During Storage · 2026 · DOI

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86 open questions have been extracted from the limitations and future-work passages of 987 Animal Nutrition and Physiology papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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