(2)point 2.1 is replaced by the following:‘2.1.Light microscopy2.1.1.PrincipleThe constituents of animal origin which may be present in premixtures, feed materials and compound feed sent for analysis are identified on the basis of typical and microscopically identifiable characteristics such as muscle fibres and other meat particles, cartilage, bones, horn, hair, bristles, invertebrates cuticular fragments, insect tracheal structures, blood products, milk globules, lactose crystals, feathers, egg shells, fish bones and scales.Microscopic examinations shall be performed after preparation of samples by sedimentation.Samples shall be subject to a sedimentation step as follows:
2.1.2.Reagents and equipment2.1.2.1.Reagents2.1.2.1.1.Concentrating agent2.1.2.1.2.Staining reagent2.1.2.1.3.Mounting media2.1.2.1.4.Mounting media with staining properties2.1.2.1.5.Rinsing agents2.1.2.1.6.Bleaching reagent2.1.2.2.Equipment2.1.3.Sampling and sample preparation2.1.3.1.SamplingA representative sample, taken in accordance with Annex I shall be used.2.1.3.1.1.Sample dryingSamples with a moisture content > 14 % shall be dried prior to handling in accordance with Annex III.2.1.3.1.2.Sample pre-sievingIn order to collect information on possible environmental contamination of the feed, it is recommended to pre-sieve at 1 mm pelleted feeds and kernels and to subsequently prepare, analyse, and report separately on the two resulting fractions, which must be considered as distinct samples.2.1.3.2.Precautions to be takenIn order to avoid laboratory cross-contamination, all reusable equipment shall be carefully cleaned before use. Separation funnel pieces shall be disassembled before cleaning. Separation funnel pieces and glassware shall be pre-washed manually and then washed in a washing machine. Sieves shall be cleaned by using a brush with stiff synthetic hairs. A final cleaning of sieves with acetone and compressed air is recommended after sieving of fatty material like fishmeal.2.1.3.3.Preparation of samples consisting of fat or oilThe following protocol shall be followed for the preparation of samples consisting of fat:The same protocol, with the exception of the first and fourth indents, shall be applied for the preparation of samples consisting of oil.2.1.3.4.Preparation of samples other than fat or oil2.1.3.4.1.Sub-sampling and grinding: at least 50 g of the sample shall be sub-sampled for analysis and subsequently ground.2.1.3.4.2.Preparation of raw material: a portion of at least 5 g of the ground sub-sample shall be prepared. It shall be sieved at 0,25 mm and the two resulting fractions shall be examined.2.1.3.4.3.Single TCE sedimentation for the detection of constituents of animal origin other than terrestrial invertebrates.2.1.3.4.4.Double PE/TCE sedimentation for the detection of terrestrial invertebrate constituents.All steps shall be realised in a conical glass separation funnel of 250 ml as described in point 2.1.2.2, fourth indent.2.1.4.Microscopic examination2.1.4.1.Slide preparationMicroscopic slides shall be prepared from the sediment and, depending on operator’s choice, from either the flotate or the raw material. When appropriate, for the detection of terrestrial invertebrate constituents only, slides shall also be prepared from the final flotate obtained as described in point 2.1.3.4.4. The two resulting fractions (the fine and the coarse one) shall be prepared. Test portions of fractions spread on slides shall be representative of the whole fraction.A sufficient number of slides shall be prepared in order to ensure that a complete examination protocol as laid down in point 2.1.4.2 can be carried-out.Microscopic slides shall be mounted with the adequate mounting medium in accordance with the SOP established by the EURL-AP and published on its website. The slides shall be covered with coverslips.2.1.4.2.Observation flowchart for the detection of animal particles in compound feed, feed material and premixtures.The prepared microscopic slides shall be observed in accordance with the observation flowcharts in Diagrams 1 and 2.The microscopic observations shall be conducted using the compound microscope on the sediment and, depending on the operator’s choice, either on the flotate or on the raw material. Additionally, for the detection of terrestrial invertebrate constituents, observations shall also be conducted on the final flotate obtained as described in point 2.1.3.4.4 in accordance with Diagram 3. The stereomicroscope may be used in addition to the compound microscope for the coarse fractions. Each slide shall be screened entirely at various magnifications. Precise explanations on how to use the flowcharts are detailed by a SOP established by the EURL-AP and published on its website.The minimum numbers of slides to be observed at each step of the observation flowcharts shall be strictly respected unless the entire fraction material does not permit to reach the stipulated slide number, for instance when no sediment is obtained. No more than 6 slides per determination shall be used for recording of the number of particles.When additional slides are prepared using a more specific mounting medium with staining properties, as described in point 2.1.2.1.4, on the flotate or the raw material to further characterise structures (e.g. feathers, hairs, muscle or blood particles), which have been detected on slides prepared by other mounting media, as described in point 2.1.2.1.3, the number of particles shall be counted based on a number of slides per determination not exceeding 6, including the additional slides with a more specific mounting medium. The additional slides prepared from the final flotate obtained, as described in point 2.1.3.4.4, for the detection of terrestrial invertebrate constituents shall not be considered for the identification of other natures (terrestrial vertebrates and fish).In order to facilitate the identification of the particles’ nature and origin, the operator may use support tools like decision support systems, image libraries and reference samples.Diagram 1Observation flowchart after single TCE sedimentation for the detection of animal particles other than from terrestrial invertebrates in compound feed, feed materials and premixtures for the first determinationDiagram 2Observation flowchart after single TCE sedimentation for the detection of animal particles other than from terrestrial invertebrates in compound feed, feed materials and premixtures for the second determinationDiagram 3Observation flowchart after double PE/TCE sedimentation for the detection of terrestrial invertebrates’ constituents in compound feed, feed materials and premixtures2.1.4.3.Number of determinationsDeterminations shall be performed on different sub-samples of 50 g each.If, following the first determination carried out in accordance with the observation flowchart in Diagram 1, or Diagram 3 when appropriate, no animal particles are detected, no additional determination shall be necessary and the result of the analysis shall be reported using the wording set out in point 2.1.5.1.If, following the first determination carried out in accordance with the observation flowchart in Diagram 1, one or more animal particles of a given nature (i.e. terrestrial vertebrates or fish) are detected and the nature of the particles found confirms the declared content of the sample, no second determination shall be necessary. If the number of the animal particles of a given nature detected during this first determination is higher than 5, the result of the analysis shall be reported per animal nature using the wording set out in point 2.1.5.3. Otherwise, the result of the analysis shall be reported per animal nature using the wording set out in point 2.1.5.2.If, following the first determination carried out in accordance with the observation flowchart in Diagram 3, more than 5 particles of terrestrial invertebrates are detected, no second determination shall be necessary and the result of the analysis shall be reported using the wording set out in point 2.1.5.3 for this nature.In all other cases, including when no declaration of content has been provided to the laboratory, a second determination shall be carried out from a new sub-sample. If, following the second determination carried out in accordance with the observation flowchart in Diagram 2, or Diagram 3 when appropriate, the sum of the animal particles of a given nature detected over the two determinations is higher than 10, the result of the analysis shall be reported per animal nature using the wording set out in point 2.1.5.3. Otherwise, the result of the analysis shall be reported per animal nature using the wording set out in point 2.1.5.2.2.1.5.Expression of the resultsWhen reporting the results, the laboratory shall indicate on which type of material the analysis has been carried out (sediment, flotate, final flotate or raw material). The reporting shall clearly indicate how many determinations have been carried out and if sieving of the fractions prior to slide preparation, in accordance with point 2.1.3.4.3, first indent, third paragraph, or point 2.1.3.4.4, third indent, was not performed.The laboratory report shall at least contain information on the presence of constituents derived from terrestrial vertebrates and from fish.The different situations shall be reported in the following ways.2.1.5.1.No animal particle of a given nature is detected:2.1.5.2.Between 1 and 5 animal particles of a given nature are detected when only one determination has been performed, or between 1 and 10 particles of a given nature are detected in case of two determinations (the number of detected particles is below the decision limit established in the SOP of the EURL-AP and published on its website):When only one determination has been performed:When two determinations have been performed:Additionally:2.1.5.3.More than 5 animal particles of a given nature are detected when only one determination has been performed, or more than 10 particles of a given nature are detected in case of two determinations:When only one determination has been performed:When two determinations have been performed:Additionally: