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Chemical Detection Techniques for Diagnosing Dairy Herd Health Problems

Department of Pathology, College of Veterinary Medicine, Iowa State University, Ames 50010

ABSTRACT

Collections and handling of samples for chemical analyses present many problems. There are at least four factors which contribute to analytical errors: sampling variation, sub-sampling variation, analytical errors, and storage of specimens.

Field sampling methods probably cause the greatest variations and chances for error, especially for feedstuffs (4). For instance, corn grain sampled from one portion of a storage bin may contain detectable amounts of mycotoxins while a sample from another portion of the same bin may yield negative analytical results. Formulated feeds pose a special problem. If mixing procedures have been faulty, the batch of feed will not be homogeneous. It is recommended that at least two samples of each batch of formulated feeds be collected in the field and maintained separately. If analysis of a composite subsample indicates significant toxicant, individual analysis of each sample will discover variations in the batch. Variations within tissues collected in the field.