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The number of sows to bleed when investigating disease depends on many factors. To give an idea of how confident one can be in interpreting serological results, two examples are given below. These do not represent a protocol - logistic, welfare and time issues may prevent large numbers of sows being bled, especially outdoors. The examples serve to illustrate that, when limited numbers of sows are bled, one must be cautious about reading too much into the results. |
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