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Open research questions in Ruminant Nutrition and Digestive Physiology

35 unresolved questions extracted from the limitations and future-work sections of 616 Ruminant Nutrition and Digestive Physiology papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • 03% PSE supplementation potentially improves lamb meat quality by favorably modulating rumen fermentation and microbe-metabolite interactions, highlighting its promise as a natural feed additive, though further validation is warranted.

    Effects of Perilla Seed Extract Dietary Supplementation on Meat Quality, Rumen Fermentation, and Rumen Microbiome–Metabolome of Tan Lambs · 2026 · DOI

  • However, in vivo studies in buffalo remain scarce, underscoring the need for future research that considers all CH4-relevant parameters within a holistic framework.

    Nutritional Strategies to Mitigate Enteric Methane Emissions in Dairy Buffaloes · 2026 · DOI

  • As CH4 results from ruminal microbiota metabolism, nutritional interventions are regarded as having the greatest mitigation potential, although most studies have focused on cattle, and buffalo-specific data remain scarce.

    Nutritional Strategies to Mitigate Enteric Methane Emissions in Dairy Buffaloes · 2026 · DOI

  • Although the correlation between GAA effects and glycemic indices remains unclear, there are indications that the creatine precursor may exert an insulinotropic effect by sharing transporters with beta-guanidinopropi- onic acid, an anti-hyperglycemic therapeutic agent.

    Creatine-precursor exposure in ewe twin pregnancy directs metabolic effort and reworks the maternal–fetal vascular system, involving genetic markers that modulate the creatine pathway · 2026 · DOI

  • Taken together, lactate participates in a wide range of physiological and pathological processes in ruminants. Conditions such as subacute ruminal acidosis, keto- sis, mastitis, and other forms of oxidative stress in dairy cows are frequently accompanied by lactate accumula- tion [136, 137]. Consequently, this lactate-enriched acidic microenvironment may provide favorable conditions for the occurrence of lactylation. In this context, histone lactylation appears to regulate ruminant metabolism in close association with anaerobic glycolysis. Accumulating evidence indicates that histone lactylation plays a pivotal role in both physiological and pathological settings [47]. Nevertheless, compared with other epigenetic modifica- tions, many aspects of histone lactylation remain poorly understood, and a substantial knowledge gap persists regarding its specific roles and mechanisms in ruminants. Several key questions remain unresolved, for exam- ple: (a) It is still unclear whether histone lactylation is an inevitable consequence of lactate accumulation or a precisely regulated process under spatiotemporal control. (b) Direct evidence for the regulatory mechanisms gov- erning lactylation in ruminants is still lacking. In particu- lar, it remains unknown whether histone or non-histone lactylation plays the dominant role in ruminant regula- tion, and whether these two forms are functionally inter- connected or potentially interconvertible. (c) The specific enzymes responsible for the writing, reading, and eras- ing of lactylation in ruminants have yet to be identified. (d) How histone lactylation interacts with other post- translational modifications to coordinately regulate gene transcription also remains to be clarified. (e) In addition, the non-histone proteins subject to lactylation in rumi- nants remain largely unknown. Therefore, systematic identification of lactylation sites and the construction of a comprehensive lactylation map in ruminants would substantially advance this field. Moreover, elucidating how diverse metabolic stresses encountered in ruminant production drive lactylation through lactate-dependent mechanisms will be of considerable importance for safe- guarding ruminant health.

    Lactate in ruminant health: metabolic roles and the emerging significance of lactylation · 2026 · DOI

  • In addition, up to 90% of existing data come from Europe, China, North America, and Australasia whereas information from other regions of the word with large populations of dairy animals and varied production systems in terms of available diets and climate conditions is scarce or nonexistent [8].

    Dairy Production and the Rumen Microbiome: Research Directions in a Challenging Future · 2026 · DOI

  • Soybean isoflavones (SIF) may modulate rumen fermentation, yet their effects on rumen function, microbiome features, host endocrine/metabolic responses, and lactation performance-particularly across cows with divergent milk-yield phenotypes-remain unclear.

    Multi-omics analysis of soy isoflavone-induced responses in rumen fermentation, endocrine status and milk production in cows with varying milk yields · 2026 · DOI

  • The study was conducted exclusively in cannulated buffalo bulls under controlled experimental conditions; validation of whether the fertilizer effects on digestibility and nutritional profile of alfalfa hold under field conditions with varying soil types, moisture regimes, and agro-climatic zones in Pakistan is absent.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • The control treatment (T0) showed significantly lower digestibility and longer lag time; the mechanisms by which nitrogen deficiency reduces rumen microbial activity and increases lignification of alfalfa cell walls require investigation through analysis of cell wall composition (cellulose, hemicellulose, lignin fractions) rather than NDF/ADF alone.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • Only urea (inorganic) and unspecified organic nitrogen sources were compared; the study lacks evaluation of alternative inorganic nitrogen sources (ammonium nitrate, ammonium sulfate) or slow-release organic sources (compost, manure types) to determine whether the superiority of T5 is specific to urea or generalizable across nitrogen fertilizer formulations.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • The paper does not examine whether the superior digestibility observed with T5 treatment (100% urea) translates to measurable improvements in livestock production outcomes (milk yield, weight gain, feed efficiency) when alfalfa is incorporated into complete diets for buffalo or other ruminants.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • The study measured in situ digestibility only at three harvest cuttings; a finer temporal resolution tracking how nitrogen fertilizer affects digestibility dynamics across 6-8 successive cuttings throughout the growing season would clarify whether fertilizer effects on crude protein retention and NDF content persist or diminish over time.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • While the T5 treatment (100% urea) showed the highest digestion rate and lowest lag time, the paper does not investigate the mechanistic basis of why inorganic nitrogen specifically accelerates fiber fermentation or whether there are optimal nitrogen concentration thresholds beyond 100% urea that could further enhance in situ digestibility in alfalfa.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • The study only evaluated nitrogen fertilizer effects on alfalfa digestibility in cannulated buffalo bulls; the interaction between organic and inorganic nitrogen sources and their differential effects on rumen microbial fermentation kinetics across different livestock species (cattle, sheep, goats) remains unexplored.

    Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls · 2026 · DOI

  • Mounting evidence indicates that gastrointestinal dysbiosis caused by induction of subacute ruminal acidosis (SARA) by high-grain diet consumption and low in dietary fiber is associated with mastitis initiation and development, however, the underlying mechanism remains unknown.

    Sialic acid exacerbates gut dysbiosis-associated mastitis through the microbiota-gut-mammary axis by fueling gut microbiota disruption · 2023 · DOI

  • One limitation of this study was the relatively small sample size used in the experiment, which was mainly due to the intensive management and monitoring requirements associated with metabolic cage studies and total fecal collection procedures.

    Nutrient Digestibility of Red Sokoto Goats During the Dry Hot Season of Derived Savanna Zone of Nigeria · 2026 · DOI

  • Efficient grazing management is critical for optimising animal growth and carcass quality in dairy beef systems; however, the combined effects of turnout date to spring pasture and post-grazing sward height have not been well quantified.

    Effects of Post-Grazing Sward Height and Early or Late Turnout Date to Pasture on the Performance of Dairy Cross-Bred Steers · 2026 · DOI

  • While medicinal plants demonstrate considerable potential for preventing calf diarrhea within antibiotic-free farming systems, their active components and mechanisms remain poorly characterized.

    Mechanism of a polyherbal mixture alleviates calf diarrhea: an integrated network pharmacology, metabolomics, and microbiome study · 2026 · DOI

  • The indigenous Borgou breed plays a central role in West African beef systems, yet its maintenance energy requirements remain insufficiently quantified under controlled feeding conditions.

    Estimating maintenance energy requirements of Borgou cattle to improve feeding precision under tropical conditions · 2026 · DOI

  • However, optimized levels remain to be determined for specific saponin sources along with their specific phytochemical characteristics and specific mechanism how they modulates rumen fermentation.

    Influence of saponin extracts on enteric methane emission and rumen fermentation: a meta-analysis of in vitro experiments · 2026 · DOI

  • Although specific literature is scarce, a number of articles reported the chemical composition of the four cakes, allowing their hierarchization and their comparison with the rapeseed cake, considered as reference feed.

    The effects of minor oilseeds cakes on rumen metabolism and productive performances of ruminants · 2022 · DOI

  • The browse of the literature on minor oilseeds cakes retrieved scattered and contradictory data, implying a need for systematic comparison, among them and against a reference feed.

    The effects of minor oilseeds cakes on rumen metabolism and productive performances of ruminants · 2022 · DOI

  • Ruminal microorganisms can derive energy for cell protein synthesis from several carbohydrate fractions, but the effect of carbohydrate type/rate of degradation on ammonia utilization in the rumen has not been adequately studied in viv o.

    Effect of Dietary Barley Levels on the Rheological Characteristics of the Digesta · 2010 · DOI

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35 open questions have been extracted from the limitations and future-work passages of 616 Ruminant Nutrition and Digestive 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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