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Three different types of subcutaneous tissue cages were evaluated as sources of tissue fluid in cattle. The biochemical composition of fluid sampled at various intervals after insertion was analysed and compared to corresponding serum values. It was shown that steel netting cages were quickly obliterated by ingrowing tissue and therefore unsuitable. The two types of silicone rubber tubing cages, on the other hand, were not obliterated and could be sampled repeatedly for volumes of about 2 ml tissue cage fluid (TCF) up to at least 32 weeks after insertion. Repeated sampling in a 12 h period was also possible. The levels of total protein and albumin in TCF were lower than in serum, and were shown to decline in the first 12 weeks after insertion to a level of about 35% of the serum concentration. Calcium and magnesium levels were also lower in TCF as compared to serum. The levels of chloride and potassium were slightly higher in TCF than in serum. For sodium no difference was observed and the results for inorganic phosphorous were not uniform. Repeated sampling did not alter the total protein and albumin level in TCF. It was also shown that cages with larger open areas had lower total protein content.

Evaluation of a Tissue Cage Model for Use in Cattle