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    Quality Assurance for Animal Feed Analysis Laboratories
    Quality Assurance for Animal Feed Analysis Laboratories
    Quality Assurance for Animal Feed Analysis Laboratories
    Ebook380 pages3 hours

    Quality Assurance for Animal Feed Analysis Laboratories

    By Food and Agriculture Organization of the United Nations

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    About this ebook

    Every sector of the livestock industry, the associated services and the wellbeing of both animals and humans are influenced by animal feeding. The availability of accurate, reliable and reproducible analytical data is imperative for proper feed formulation. Only reliable analysis can lead to the generation of sound scientific data. This document gives a comprehensive account of good laboratory practices, quality assurance procedures and examples of standard operating procedures as used in individual specialist laboratories. The adoption of these practices and procedures will assist laboratories in acquiring the recognition of competence required for certification or accreditation and will also enhance the quality of the data reported by feed analysis laboratories. In addition, ensuring good laboratory practices presented in the document will enhance the safety of the laboratory workers. The document will be useful for laboratory analysts, laboratory managers, research students and teachers and it is hoped that it will enable workers in animal industry, including the aquaculture industry, to appreciate the importance of proven reliable data and the associated quality assurance approaches. An additional effect of implementing and adopting these approaches will be strengthening of the research and education capabilities of students graduating from R&D institutions and promotion of a better trading environment between developing and developed economies. This will have long-term benefits and will promote investment in both feed industries and R&D institutions.

    LanguageEnglish
    PublisherFood and Agriculture Organization of the United Nations
    Release dateApr 14, 2015
    ISBN9789251078594
    Quality Assurance for Animal Feed Analysis Laboratories
    Author

    Food and Agriculture Organization of the United Nations

    An intergovernmental organization, the Food and Agriculture Organization of the United Nations (FAO) has 194 Member Nations, two associate members and one member organization, the European Union. Its employees come from various cultural backgrounds and are experts in the multiple fields of activity FAO engages in. FAO’s staff capacity allows it to support improved governance inter alia, generate, develop and adapt existing tools and guidelines and provide targeted governance support as a resource to country and regional level FAO offices. Headquartered in Rome, Italy, FAO is present in over 130 countries.Founded in 1945, the Food and Agriculture Organization (FAO) leads international efforts to defeat hunger. Serving both developed and developing countries, FAO provides a neutral forum where all nations meet as equals to negotiate agreements and debate policy. The Organization publishes authoritative publications on agriculture, fisheries, forestry and nutrition.

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      Quality Assurance for Animal Feed Analysis Laboratories - Food and Agriculture Organization of the United Nations

      Introduction

      Availability of animal feed and efficient feeding are the foundations of successful livestock production. The feeding of a balanced ration and correct feed formulation increases animal productivity, quality of product and animal welfare. Also to decrease livestock associated pollution of the environment, feeding of a diet that matches the physiological status of the animal is essential.

      For the best health protection of both the animal and human population and to facilitate trade between developing and undeveloped countries, the harmonising of Quality Assurance approaches is imperative.

      A robust Quality Management System provides the mechanism to ensure that all these criteria are met and provides a system to constantly monitor laboratory results and identify opportunities for improvement.

      A Quality Management System provides management, staff and customers with confidence that all technical, administrative and human factors that influence the quality of the results being generated are under continuous supervision with the aim to prevent non conformity and identify opportunities for improvement.

      This manual has been prepared to describe a Quality Management System that may be used by animal nutrition/feed analysis laboratories and serve as a reference source which specific laboratories can use to implement protocols appropriate to their specific situations. However the principles laid down are generalised and may not apply to every laboratory situation.

      The Quality Management System described in this manual is based on ISO 17025:2005 principles and is intended to help laboratory personnel maintain the standards expected while providing a consistent, reliable, efficient and professional service with the level of quality required by the laboratory’s customers. This policy is achieved through the commitment of management and staff at all levels to apply laboratory practices that ensure the quality of testing services and of the results produced.

      Since the work in individual laboratories varies greatly it is essential to have a flexible yet detailed Quality Management System. The laboratory personnel must have an understanding of the principles underlying quality assurance and must apply them in all areas of their work. Only in this way can they maintain credibility, which is the most important attribute of any laboratory. This manual provides a strong foundation for laboratories on which they can develop a Quality Management System which will meet the requirements of the international standard.

      The manual has been divided in two main sections. Part I presents general aspects of quality assurance procedures and good laboratory practices that must be put in place in the feed analysis laboratory. Part II contains some basic procedures for determination of nutrients and mycotoxins. The methods described for various analytes have been taken from official recognised methods as well as from the laboratories whose representatives contributed to the production of this document. The analysts in these laboratories have been using these methods for many years and the methods have proved reliable. However, other methods or variants of the methods presented in this manual may also be used.

      It is planned to include a number of important techniques for feed additives, microbiological agents, drug residues and other undesirables and associated quality assurance approaches in the next edition of the manual.

      PART I

      Quality assurance procedures and good laboratory practices

      Setting up a quality laboratory system

      QUALITY AND QUALITY CONTROL SYSTEMS

      This section explains what is meant by Quality and Quality Management System and how this will impact on and improve working in a laboratory.

      What does Quality mean?

      Quality is not easy to define but it needs to be defined by an accredited laboratory. It can mean different things to different people. However, in all aspects of business ‘Quality’ has become very important. Whether it is a manufacturing or a multi-disciplinary organisation, all successful organisations want to be associated with the word ‘Quality’.

      So what is Quality? A textbook definition is: Quality is fitness for purpose.

      The International Standards Organisation (ISO) has produced a document entitled ‘Quality Management Systems – Fundamentals and Vocabulary’, in which the word ‘Quality’ is defined as: Degree to which a set of inherent characteristics fulfils requirements.

      This clearly indicates that achieving quality means fulfilling requirements. The requirements may come from customers and in some cases from regulatory authorities.

      How can Quality be achieved?

      Quality is everyone’s responsibility; it must be built in at every stage of the process, from identifying the customer’s needs, through planning and implementation right up to the point of reporting analytical results.

      In some cases, quality needs to be checked even beyond delivery to the customer since customer satisfaction can have an enormous impact on quality as perceived by them.

      Making it happen!

      It must be understood that quality does not occur by accident. The starting point is identifying the customer’s needs and from that a plan must be considered for the processes and resources and application of monitoring controls. The analyst needs to be continually assessing his/her performance against his/her own objectives and standards to strive for improvement. Since quality does not occur by accident there is a need to establish an effective Quality Management System in order to ensure that requirements are fulfilled efficiently and effectively. This manual is a start to achieving this.

      Quality Management System

      A Quality Management System directs and controls an organisation with regard to quality by putting in place standard operating procedures (SOPs) to which everyone operates in a consistent manner. This, in combination with regular internal checks (audits), a system of investigating problems (anomalies) and constantly identifying opportunities for improvement will reduce the occurrence of unreliable results.

      Why implement a Quality Management System?

      Having a documented system results in all staff operating to a common standard and provides assurance to customers of test reliability and consistency of service. A Quality Management System that complies with an international standard will be recognised around the world and will demonstrate conformity in international markets.

      What a laboratory analyst is expected to do to comply?

      On commencing employment, all new staff should be issued with a copy of this manual. Staff are expected to read it and understand its contents (where appropriate). Staff should also be issued with a Training File in which they can demonstrate their experience and competency in following the standard, the Quality Management System and their proficiency in nutritional analysis procedures.

      Training File

      The training file should demonstrate experience and competency to perform the job the individual holds. This file should be held by the individual and updated as training is provided, in liaison with their supervisor. The Training File should contain a job description, an organisational chart, a CV (resume) and evidence of relevant training and education received to date. As new training is received, evidence verified by a line manager, should be included describing the training. Ongoing competency should also be demonstrated by documenting participation in EQA (External Quality Assurance) and IQA (Internal Quality Assurance) programmes managed by the laboratory.

      QUALITY ASSURANCE PURPOSE AND GUIDELINES

      Laboratory quality programs are a critical part of improving the agricultural laboratories in developing countries. The Laboratory Quality Manual is the essential source for communicating to the laboratory staff the manner in which laboratory testing is to be conducted. Adherence to the quality manual by laboratory staff is necessary to ensure both quality and consistency. Recognizing the Laboratory Manual may not cover all situations and variables arising from the laboratory setting, any significant departures must have the approval of management and must be appropriately documented.

      The management within the laboratory is responsible for the quality and integrity of all data generated in the laboratory. The management, collectively, assures this quality through adherence to the laboratory manual, quality assurance plan, and through the development and adherence to standard operating procedures.

      The flowchart in Figure 1 provides a simplified representation of the Quality Management System described in this manual and is not a substitute for the procedures contained within.

      LABORATORY ORGANIZATION AND RESPONSIBILITIES

      Each member of the laboratory should have clearly identified and documented responsibilities (Job Description). An organizational chart should be included in the laboratory quality document and made available in staff training records.

      Laboratory Manager/Director has ultimate responsibility for implementing the quality system.

      Quality Manager reports directly to the Laboratory Manager/Director and is responsible for maintaining and developing the quality procedures used in the laboratory.

      Laboratory analysts responsible for following all quality procedures and identifying opportunities for improvement.

      PERSONNEL TRAINING AND QUALIFICATION

      Qualified and trained personnel are essential for producing analytical results of acceptable quality. Laboratory management ensures that laboratory personnel have the knowledge, skills and abilities to perform their duties. Competence is based on education, experience, demonstrated skills and training. Staff training files contain the documentation of personal education, experience, skills and training for the position held.

      Analysts undergo a training program in accordance with the laboratory’s training procedure. The analyst must demonstrate and document proficiency in an analytical method before reporting results to the laboratory’s customers. The first step for qualifying in a new analysis is to read the standard operating procedure (SOP). A copy of this document can be obtained from the Laboratory Manager/Director. The method should be reviewed with the analyst by someone familiar with the procedure and then the analyst should run a specified number of known samples or standards. The training should be documented in the individuals training file. To assure the safety of everyone, the trainee must read the Material Safety Data Sheet (MSDS) for information concerning each chemical used in the analysis. The toxicity levels and method of waste disposal should be clearly understood before beginning any analysis. The number of samples and standards analysed should be specified by the supervisor. The results should be compared to previously obtained results using a paired t-test. If there is no significant difference at the 95% confidence level the new analyst can be considered qualified. On-going competency should be demonstrated by participation in Internal Quality Assurance (IQA) or ring trials at regular intervals.

      ANALYTICAL PROCEDURES – SELECTION AND VERIFICATION

      When the customer does not specify the method to be used, a recognised (ISO, CEN, AOAC, FDA etc.) standard method is preferred. If a standard method is not found the laboratory may use either a non-standard method or modify a method for use with the concurrence of the customer. The laboratory informs the customer when the method proposed by the customer is considered to be inappropriate for the intended purpose. The standard and non-standard or modified method must be sufficiently validated by the laboratory before being used to report data.

      When the laboratory develops methods for its own use, the laboratory has a procedure for its introduction.

      Non-standard methods are those methods not taken from authoritative, validated sources. A non-standard method has not undergone validation, such as a collaborative study or process to evaluate the method’s performance capabilities.

      Non-standard methods are selected for use when a customer request cannot be addressed with the use of a standard method. Such methods are subject to agreement with the customer and are validated.

      Validation is the confirmation by examination and the provision of objective evidence that the particular specifications for an intended use are fulfilled.

      The laboratory validates standard methods, non-standard methods, laboratory developed methods and modified standard methods, including use outside the intended scope and applications. Validation is conducted to confirm that the methods are fit for the intended use. The performance of all methods is verified before being used to generate reportable data.

      The validation process addresses the needs of the given application. The attributes and data quality objectives include but are not limited to:

      Accuracy

      Precision

      Limit of detection (LOD)

      Limit of quantification (LOQ)

      Linearity

      Accuracy and precision target limits can be taken from AOAC (Horwitz). Precision or repeatability is calculated as the relative standard deviation (coefficient of variability) and accuracy is calculated as percentage recovery (Table 1).

      STANDARD OPERATING PROCEDURES (SOPs)

      SOPs are specific to the point of use for which they are written. The approval of a SOP is the commitment of a specific area to an action or behaviour. SOPs may be written by a competent employee within the laboratory. The SOP is then reviewed for content and authorised by the supervisor or manager in the area in which the SOP will be used. Once the SOP has been reviewed and found to be acceptable by the supervisor or manager, the SOP is given to the Quality Manager for approval and issue.

      The format used for writing SOPs should contain the following when appropriate:

      Principle

      Scope

      Responsibilities

      Equipment

      Reagents

      Procedure

      Quality Control

      Calculations

      Troubleshooting

      Remarks

      References

      Appendix (Flow Charts, Tables, References, etc.)

      SOPs are controlled documents and must include an issue (or effective) date, the name of the author(s) and person(s) authorising the SOP, a review date and version number. When a new version of an SOP is issued a ‘Log of Updates’ will summarize changes made at the start of the document. When a new version of an SOP is issued all previous controlled versions must be withdrawn.

      It is advisable to forbid uncontrolled versions of SOPs.

      EQUIPMENT MAINTENANCE AND SERVICE

      The procedures to determine, maintain, and monitor instrument performance are an integral part of a quality control program as they promote a high degree of confidence in analytical results. Each procedure is described in the respective equipment SOP. All essential testing equipment has its own SOP and maintenance records that document operation, calibration and routine maintenance. Staff using essential equipment must have appropriate training documented in their training file.

      Maintenance. Complete and accurate installation instructions, operating manuals, parts manuals, service manuals and written guarantees or contracts are kept with each instrument to assure proper functioning. The implementation of a preventive maintenance program which includes the testing of equipment against specifications and procedures for frequent calibration, checking and cleaning, is essential. The performance of instruments and equipment is evaluated on a regular basis to ensure that the equipment or instrument continues to function properly and has the appropriate historical records to properly audit and to evaluate. Routine maintenance tasks such as cleaning, adjusting, replacing of parts or lubricating are performed on each instrument by the responsible officer according to instructions provided in the operating manual of the instrument or as identified by past experience.

      All maintenance tasks and repairs performed by the analyst or the service representative are recorded on the current instrument log sheet for each instrument. Analysts must report all malfunctions immediately to the responsible person for the instrument and clearly indicate that it is OUT OF ORDER when a malfunction occurs.

      When available, service contracts which include semi-annual/annual maintenance of certain pieces of equipment should be obtained.

      Calibration. The validity of the analytical results produced is strongly related to the performance level of the instrumentation used for analysis. It is therefore essential that for each instrument and each method, proper calibration procedures be established and that calibration results be recorded and used as a basis for continuous assessment of the instrument performance. The method calibration requirements are included as part of the method. Equipment/instrument calibration and traceability to national standards should be documented. Certified weights and thermometers are available and should be used and the documentation maintained in the laboratory.

      Inventory. A permanent inventory record of all equipment is kept by the Laboratory Manager/Director. This record includes the equipment’s name, model number, serial number, manufacturer, date of acquisition, original cost and present location and any unique identifier assigned locally.

      Parts and Supplies. The analyst must maintain a list of spare parts kept that are critical to keep the instrument operating and must review this list at least annually. This list is to be kept in the Instrument Log Book.

      Responsible Officer. A responsible officer is assigned to the essential equipment. This person is normally the principal user of the system. In the case of shared equipment the responsible officer carries out performance checks and maintenance while the operators verify the calibration, run standards, operate the instrument in the correct manner, record data as required and informs the responsible officer of any anomalies or malfunctions.

      The duties of the responsible officer are as follows:

      A nominated deputy should be identified to perform these tasks in the absence of the Responsible Officer.

      Instrument Log Book. The main purpose of the instrument log book is to provide a permanent record of instrument performance and to be used as a basis for validating data and projecting repair and replacement needs, or new acquisitions. If applicable, the service contract number is recorded in the log book.

      Each time the instrument is used, the analyst must enter the information requested in the Log Book which will provide the laboratory with a record of use of the instrument, its performance and also any maintenance and repairs.

      REPORTING ANALYTICAL DATA

      Each procedure must specify the applicable range of the analyte to which it may be applied with some realistic significance (test limitation). The Laboratory Analyst is obligated to report numerical values which include only those numbers that are certain plus one digit that is estimated. This group of numbers is referred to as a significant figure. If more than one uncertain number is reported, a reader might be misled concerning the precision to which a measurement or set of measurements was made. To standardise the reporting of laboratory data, two conventions should be used. One deals with the rounding of numbers and the other with the reporting of significant figures. When it is necessary to round off data, round the number to the next higher value if the digit to its right is ≥ 5. If the last number discarded is < 5, leave the last retained digit unchanged. If the number to the right is 5, followed by zeroes only, round to the nearest even number.

      The definition offered for significant figures is that they include all numbers in a result known with certainty plus one uncertain value. The position of the decimal point is irrelevant. When data are reported, use the following rules to determine the number of significant figures:

      Some examples: If the zero is bounded on both the left and right by another number, it is always significant, 306 has three significant figures. If the zero is used to fix the decimal point it is never significant, 0.0024 has two significant figures, 0.00240 has three significant figures.

      ACCURACY AND REFERENCE SAMPLES

      To assure the accuracy of the procedure a reference sample (working standard) with known and stable values should be run with each batch and evaluated by means of a control chart (see section on control charts).

      The reference material can be a pure substance Reference Material (RM) and the recovery of the analyte will be a measure of the accuracy of the method.

      For most feed analyses however, Certified Reference Material (CRM) or a home-made feed reference sample (HRM) is used.

      The CRM can be obtained from organisations for proficiency tests of animal feeds (Table 4) where the reference values are determined by several laboratories applying several independent validated test methods. A lab can also make its own reference sample. A feed material should be chosen which

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