DDC Tech Day | Sensory Evaluation Study of Feed Flavoring Agents
Abstract: Sensory evaluation is an essential research tool in the development of food products and other consumer goods. Sensory evaluation methods are widely applied in the food industry, and although feed flavorings target a different audience, proper sensory assessment can significantly aid product development, quality control, and marketing strategies. This article outlines the construction methods and key considerations for establishing a sensory evaluation laboratory dedicated to feed flavorings, discusses the selection and training of evaluators, highlights the importance of choosing scientifically sound sensory evaluation techniques, and elaborates on practical approaches to sensory quality control. These insights provide valuable guidelines for leveraging sensory evaluation in the development and quality assurance of feed flavorings.
Keywords: Sensory evaluation, feed flavoring agents, methods
Feed flavoring agents are feed additives used to enhance the taste and palatability of feed, thereby boosting animals' appetite. [1] Currently, feed flavorings are being increasingly applied in animal feed. While animal experiments can effectively evaluate product performance and application efficacy, they still rely on human judgment when it comes to describing specific product characteristics. Sensory evaluation methods offer a more intuitive way to assess these attributes. Compared to physicochemical and hygiene indicators, factors like color, aroma, and taste often serve as the most direct criteria for gauging and determining product quality. Unfortunately, there is currently no standardized method to objectively measure the aroma and flavor of feed flavorings, making it impossible to subject them to the same rigorous testing and monitoring as other key metrics. Based on sensory evaluation practices conducted in daily work, this study summarizes the methodologies and insights gained during the process, aiming to explore sensory evaluation techniques for feed flavorings. These findings will ultimately provide valuable approaches and tools for product design, development, and quality control.
1 The Establishment of a Sensory Evaluation Room [1]
The linguistic descriptions of feed flavor enhancers—such as their aroma and taste—inevitably rely on human sensory evaluations. To minimize the influence of external environmental factors on human perception, sensory evaluations should be conducted in a dedicated testing room. This sensory assessment room should be located in a well-ventilated area, free from odors and noise. Additionally, the evaluation room must be separated from the sample preparation area, with walls and furnishings painted in neutral tones or colors that avoid distracting attention—options like milky white, pure white, or soft neutral gray are recommended. The room should also utilize odorless, non-absorbent, and non-emissive building materials, ensuring proper ventilation, quiet surroundings, and adequate lighting to facilitate accurate and objective assessments.
2 Evaluator Screening [2]
Sensory evaluation involves humans assessing and describing samples through methods such as sight, smell, taste, and touch. Since individuals differ in their sensory organs and, consequently, in sensitivity levels, it is particularly important to train a group of qualified sensory evaluators to enhance the scientific rigor and accuracy of the process. Sensory evaluators should be in good physical health, genuinely interested in sensory evaluation activities, and maintain healthy lifestyle habits—such as avoiding smoking and excessive alcohol consumption. They should also possess a solid understanding of the products being evaluated, along with strong analytical, interpretive, and communicative skills for clear verbal descriptions. For product development, candidates can be selected from within the R&D or quality control departments, ensuring quick access to expert insights. In the case of market testing, personnel with particularly acute senses of smell and taste can be chosen from various departments.
3 The Selection of Sensory Evaluation Methods [3-4]
Sensory evaluation of feed flavoring agents involves first conducting sensory descriptions of the samples and then distinguishing between two or more samples. Depending on the evaluation objective, different sensory testing protocols are designed to analyze attributes such as aroma and sweetness in the samples. National standards apply. GB/T12310-1990、GB/T12311-1990、GB/T17321-1998、GB/T12312-1990 Detailed regulations and explanations have been provided for various specific sensory analysis methods, incorporating or referencing corresponding international standards. Select the appropriate evaluation method based on the purpose of the assessment. GB10220-88 Commonly used sensory analysis methods in China include: A , Difference testing method; b , scale and category testing; c , analytical or descriptive tests.
In daily sensory analysis work with feed flavorings, commonly used methods include the paired comparison test, the triangle test, and the two-… - The three-point test method; the ranking and scoring methods used in scale and category tests; as well as analytical or descriptive testing. For example, when evaluating the differences between a newly developed product and an existing one, the three-point test can be employed. Evaluators are asked to determine whether there are significant differences in aroma and flavor between the two products. According to the requirements of this test method, evaluators are provided with three coded samples—two of which are identical—tasking them to identify the sample that differs from the other two. Based on the statistical analysis of the number of correctly identified samples, a comparison against the test value table will reveal whether a discernible difference exists between the two products. In routine quality control, however… - The triangle test method is commonly used to monitor sensory quality differences among batch products, while analytical or descriptive testing can be applied to analyze trend-based sensory quality variations in retained samples and to support the development of new products.
Table 1 Test Method for Sensory Evaluation Analysis of Feed Flavoring Agents [5]
|
Sensory Evaluation Methods |
Purpose |
Applicable Subjects |
|
|
Difference Test |
Pairwise Comparison Test |
Determine whether there is an observable difference between the two samples. |
New product development, sensory quality control of batch products during routine inspections, assessment of evaluator competency, and determination of sample quality—whether superior or inferior. |
|
Three-point test method |
|||
|
Two - Three-point test method |
|||
|
Scale and Category Testing |
Sorting method, scoring method |
New product development without a target audience, determining the quality of samples—whether good or poor—and assessing the capabilities of evaluators |
|
|
Assessment Method |
The process of determining specific metrics in new product development |
||
|
Analytical or Descriptive Analysis |
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