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In Vitro Animal Digestion Model Development
BioVenic provides in vitro animal digestion model development and optimization services for establishing gastrointestinal-tract simulation systems in monogastric and ruminant animals to support feed development, feed additive evaluation, and nutrient mechanism studies. Our platform covers the major model components — gastric, small-intestine, and rumen fermentation simulation systems — with species-specific solutions for monogastric and ruminant animals as well as custom-built systems for other species. We support comprehensive model construction and optimization, enzymatic solutions (digestive enzyme extraction, activity assays, and novel enzyme development), artificial gastrointestinal fluid formulation, and product analysis covering digestibility, degradation rates, and the digestion products of proteins, carbohydrates, and lipids.
In Vitro Animal Digestion Model Optimization
To cater to specific research requirements, existing animal in vitro digestion models may not always suffice. We offer tailored optimization services for animal in vitro digestion models based on your animal species, experimental objectives, and any additional special requirements. Our service encompasses the optimization of the animal in vitro digestion solution composition, adjustment of digestion parameters and processes, and refinement of result analysis methods.
Fig. 1 Fish in vitro digestion protocol1,2
In Vitro Animal Digestion Model Enzymatic Solutions
In in vitro digestion experiments, simulating the physiological environment necessitates the use of one or more enzymes. These enzymes may include mixed enzymes or individual ones like amylase, pepsin, trypsin, chymotrypsin, and others. At BioVenic, we not only provide enzyme products suitable for in vitro digestion models but also offer solutions for obtaining custom enzymatic combinations tailored to your specific project.
- Extraction and Purification of Digestive Enzymes
Digestive enzymes play a vital role in the digestive process and vary considerably across different animal species. To ensure more reliable experimental outcomes, it is necessary to extract digestive enzymes directly from the animal's digestive tract or organs. In addition to our existing range of animal-derived digestive enzymes, we also provide extraction and purification services, enabling you to obtain in vitro digestion models that closely mimic the physiological state of animals.
- Enzymatic Assays
To simulate the activity of digestive enzymes in the gastrointestinal tract and assess model feasibility, measuring enzyme activity is essential. We offer various enzymatic determination methods, including enzyme activity assessment, characterization, and kinetics testing. Our comprehensive enzymatic assays assist in addressing enzyme-related queries within in vitro digestion models.
- Novel Enzyme Development
Certain specialized animals or digestion models may require enzymes that are not readily available. In such cases, we can develop novel enzymes tailored to meet your specific needs. Our services cover enzyme design, expression, property determination, and large-scale production, all aimed at providing satisfactory solutions.
Artificial Gastrointestinal Fluid Development
Due to the diversity of animals, digestive environments vary in terms of pH, nutrient composition, ion composition, and more. To fulfill the diverse needs of animal nutrition researchers, we offer artificial gastrointestinal fluid development services. Our team develops customized products that precisely match your requirements, including composition, pH, viscosity, enzymes, stabilizers, and other customizable indicators.
In Vitro Animal Digestion Product Analysis
The in vitro digestion model serves as a valuable tool for evaluating nutritional digestion characteristics. Analyzing the products of in vitro digestion is a crucial step in such research. With our integrated analysis platform, we provide comprehensive analyses of digestibility, degradation rates, and products derived from various nutrients. Expect standardized testing and easily interpretable experimental results from our services.
Some of the testing items are as follows:
- Digestibility.
- Protein in vitro digestion products: amino acid composition, peptides.
- Carbohydrate in vitro digestion products: total sugar, reducing sugar, glucuronic acid, etc.
- Lipid in vitro digestion products: TAG, DAG, FFAs, etc.
- Structural analysis: scanning electron microscopy, laser particle size analyzer, etc.
- Other characteristics: antioxidant properties, etc.
Related Research
In a study comparing in vivo and in vitro dry matter (DM) and neutral detergent fiber (NDF) digestibility in donkeys, fecal inoculum was used as the microbial source in an Incubator. Four donkeys were fed two types of hay with or without flaked barley in a 4 × 4 Latin square design. Total feces were collected for 6 days to determinein vivo digestibility, while in vitro digestibility was estimated after 60 hours of incubation. In vivo digestibility estimates were consistently higher than in vitro values, and predictive equations showed limited reliability (R² = 0.47 for NDF, R² = 0.21 for DM digestibility). The study identified that sample size and incubation duration require species-specific optimization, as donkey fecal inoculum differs in microbial composition and activity from ruminant sources. This work provides critical validation data for developing non-ruminant in vitro digestion models, demonstrating that fecal-based inoculum systems require calibration against in vivo reference methods before reliable feed evaluation.
Fig. 2 Relationship between 60-h in vitro digestibility and in vivo digestibility.1,3
In Vitro Animal Digestion Model Development Service Process
In Vitro Animal Digestion Model Applications
- Feed Development
The evaluation of nutrients within living organisms is typically done by conducting feeding trials on the specific animals of interest, where measurements of growth performance and fecal nutrient content are taken. While this approach delivers more precise and representative outcomes, it is time-consuming and costly. To address this, in vitro methods employing laboratory equipment have gained popularity for assessing digestibility by simulating the physiological processes of the animal's gastrointestinal tract. In vitro digestion model is now a useful tool for development of new feed and novel formulations.
- Feed Additive Development
The development of feed additives is beneficial for improving the growth performance and product quality of animals. The activity and availability of feed additives are the focus of attention in their development. The evaluation of feed additives through in vitro digestion models can study their tolerance to the digestive system environment and their metabolic mechanisms. Our in vitro animal digestion model development solution can provide valuable insights for the development of feed additives such as enzymes, probiotics, and prebiotics.
- Mechanism Studies
By simulating the physiological state of gastrointestinal tract in animals, we can study the mechanism and action of certain nutrients, which is beneficial for understanding the source, transformation process, and product type of a certain nutrient before conducting in vivo research. As a preliminary experiment for animal experiments, it provides valuable information for formal experiments, which is beneficial in reducing unnecessary human and material costs.
Why Choose Us?
- Dedicated Service
Our committed team is here to provide you with attentive service, catering to your research needs. We prioritize your research program, ensuring we understand your requirements and actively seek your feedback.
- Stay Informed on Academic and Industry Trends
Our technicians possess extensive expertise in the field of animal nutrition and remain up-to-date with the latest industry developments. We focus on academic and industry hotspots, guaranteeing our research aligns with the forefront of knowledge.
- Comprehensive Research Platform
Our research platform encompasses professional researchers, specialized instruments, and systematic research processes. This combination enables us to offer comprehensive research solutions and services tailored to your specific needs.
- Animal-Friendly Approach
By conducting in vitro digestion tests, you can assess feeds before experimental trials. This approach allows us to make informed decisions, minimizing the unnecessary use of animals in experiments. We deeply value animal welfare and strive to reduce their involvement in research.
Case Study: Nutrient Detection Across an In Vitro Animal Digestion Model
Objective: A feed-formulation client developing an in vitro animal digestion model needed reliable, compartment-resolved nutrient quantification to characterize how a target feed's nutrients are released and become bioaccessible along the digestive tract. BioVenic provided a nutrient detection service: the client supplied digesta samples from each GI compartment, and BioVenic ran a standardized detection panel to quantify the digestion profile.
System: The client's in vitro GI digestion model spanning the gastric, small-intestine, and large-intestine stages.
Samples provided by client: Digesta collected at each GI compartment at study endpoint.
BioVenic nutrient detection panel: Crude protein and amino-acid profiling, mineral and vitamin quantification, and metabolite fingerprinting by LC-MS/MS and GC-MS together with standard biochemical assays.
Fig. 3 Nutritional Release in an Animal Digestion Model
Frequently Asked Questions
Q1: Which animal species and digestion models do you support, and why choose in vitro over in vivo?
A: We develop in vitro digestion models for the major production species through dedicated sub-services—monogastric animals and ruminants (with aquatic models also demonstrated in our protocols). Each model replicates the gastrointestinal tract by controlling ionic strength, pH, and adding the relevant enzymes and bile salts. Compared with live feeding trials, in vitro systems are far more cost-effective and high-throughput, deliver results faster, and avoid the ethical and animal-welfare concerns of clinical studies—making them ideal for early-stage screening before committing to in vivo work.
Q2: How are the enzymatic systems and artificial gastrointestinal fluids customized per species?
A: Because digestive enzymes and environments differ substantially across species, we tailor both. Our enzymatic solutions use mixed or individual enzymes (amylase, pepsin, trypsin, chymotrypsin, etc.) and, for higher physiological fidelity, we can extract and purify native digestive enzymes directly from the animal's own digestive tract or organs. We also run enzymatic assays (activity, characterization, kinetics) and can develop novel enzymes when commercial ones do not fit. On top of that, our artificial gastrointestinal fluid development service customizes composition, pH, viscosity, enzymes, and stabilizers to match each species' digestive environment.
Q3: What digestion products and analytical endpoints do you measure?
A: Using our integrated analysis platform we quantify digestibility and degradation rates and profile the resulting nutrients: proteins into amino-acid composition and peptides; carbohydrates into total/reducing sugar and glucuronic acid; lipids into TAG, DAG, and free fatty acids. We add structural characterization (scanning electron microscopy and laser particle-size analysis) and can assess properties such as antioxidant activity. Small-molecule products are typically quantified by LC-MS/MS, GC-MS, or HPLC, giving standardized, interpretable outputs for feed and nutrient evaluation.
Q4: How can in vitro digestion models support my feed, feed-additive, and mechanism research?
A: They are a practical bridge between the bench and the barn. For feed development, they screen new feeds and formulations far more cheaply than growth or digestibility feeding trials. For feed-additive development, they reveal how enzymes, probiotics, and prebiotics tolerate the digestive environment and act metabolically. As a preliminary to in vivo studies, they let you probe nutrient sources, transformation, and products—cutting unnecessary animal use and cost. Our one-stop offering (model optimization, enzyme solutions, artificial GI fluid, and product analysis) supports all three applications end to end.
Our goal is to solve the challenges you face in animal in vitro digestion through our animal in vitro fermentation model development service. With our in vitro animal digestion model optimization, in vitro animal digestion model enzyme solutions, artificial gastrointestinal fluid development and in vitro animal digestion product analysis services, you can explore the multiple applications of in vitro animal digestion models. Together, we aim to advance the fields of animal nutrition and feed development. If you are interested in our services, please contact us. We eagerly await your contact.
References
- Distributed under Open Access license CC BY 4.0.
- Wang, Ricky, et al. "In-vitro digestion models: a critical review for human and fish and a protocol for in-vitro digestion in fish." Bioengineered 12.1 (2021): 3040-3064. https://doi.org/10.1080/21655979.2021.1940769. The title was changed to "Fish in vitro digestion protocol".
- Tassone, Sonia, et al. "Comparison of in vivo and in vitro digestibility in donkeys." Animals 10.11 (2020): 2100. https://doi.org/10.3390/ani10112100. Without Modification.