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The test for Amprol cannot be run directly on the finished feed.It is necessary to extract the compound with 65% methanol and filter the extract.In general, the dimethylformamidesodium methylate test was most satisfactory as a field procedure for detection of Zoamix in either premixes or finished feed. The reagents are very stable and can be used for long periods of time.The sodium methylate test was therefore adapted to the determination of the distribution of Zoamix in the finished feed.In the preparation of Zoamix, the chemical is coated on small particles of soybean meal.When the meal is mixed with the other feed ingredients, these particles are distributed throughout the feed. When a small quantity of the feed is spread uniformly between two pieces of filter paper and is pressed on a pad moist with dimethylformamide and sodium methylate, the compound appears as green areas.The color is transferred to the paper when pressure is exerted on the system, and visual indication of the distribution of Zoamix is obtained (Figure 2). This test is simple to operate and the equipment-i.e., Petri dishes, test tubes, etc.-can be used over and over again by simply washing and drying it between each test. This pro-cedure has been employed to study the distribution of Zoamix in various lots of commercially prepared feed and has been very helpful in determining when the sample is well mixed. Literature Cited(1) Schulz, E. P., Szalkowski. C. R.,

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