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Mixed messages from "experts"?
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<blockquote data-quote="bovine" data-source="post: 1817092" data-attributes="member: 12486"><p>Then you are brave. It's not a good enough test in cows at drying off to reliably detect infected quarters.</p><p></p><p style="margin-left: 20px">In conclusion, only CMT was not adequate to determine subclinical intramammary infections at the dry-off cows, and to evaluate the findings of CMT with the results of bacteriological examination. <a href="http://www.cabdirect.org/abstracts/20143217278.html;jsessionid=5D16A86A3743B74E9615D636F9019A79" target="_blank">http://www.cabdirect.org/abstracts/20143217278.html;jsessionid=5D16A86A3743B74E9615D636F9019A79</a> </p> <p style="margin-left: 20px"></p><p>It will give you both false positive (ie classify a cow as high SCC when she is not) and false negative (ie classify a cow as not infected when she is).</p><p></p><p>The study I linked found it 50% effective - ie no better than a guess!</p><p></p><p>I wouldn't dream of basing the decision over selective dry cow on CMT alone. Some vets seem to be advocating a 'quick check' with CMT on suitable low SCC cows - this also muddies the water unnecessarily, and suggests they don't really understand how the tests work.</p></blockquote><p></p>
[QUOTE="bovine, post: 1817092, member: 12486"] Then you are brave. It's not a good enough test in cows at drying off to reliably detect infected quarters. [INDENT]In conclusion, only CMT was not adequate to determine subclinical intramammary infections at the dry-off cows, and to evaluate the findings of CMT with the results of bacteriological examination. [URL]http://www.cabdirect.org/abstracts/20143217278.html;jsessionid=5D16A86A3743B74E9615D636F9019A79[/URL] [/INDENT] It will give you both false positive (ie classify a cow as high SCC when she is not) and false negative (ie classify a cow as not infected when she is). The study I linked found it 50% effective - ie no better than a guess! I wouldn't dream of basing the decision over selective dry cow on CMT alone. Some vets seem to be advocating a 'quick check' with CMT on suitable low SCC cows - this also muddies the water unnecessarily, and suggests they don't really understand how the tests work. [/QUOTE]
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