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Cell counts in sheep
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<blockquote data-quote="neilo" data-source="post: 1838984" data-attributes="member: 348"><p>If, as normally happens with sheep, any that get mastitis are culled, everyone is already selecting hard against mastitis prone sheep. If they are removed from the gene pool with a trip to the abattoir, they don't get to breed many replacements.</p><p></p><p>If BF levels are effecting growth rates (as would shown to be the case in Trident Feeds trials years back), that would be reflected in the 8 week wt ebvs.</p><p></p><p>Personally, I would think getting a sample from every ewe without contamination would be anything but 'no more hassle than scanning'. I was involved in a Warwick Uni study into sheep mastitis a couple of years ago, where I collected samples from all sheep that got mastitis and from 20 or so that they wanted to investigate as well. It was a real PITA.</p><p>Presumably you'd take several samples at weekly/monthly intervals to get a representative sample? In dairy cows, the scc changes according to stage of lactation, so one sample wouldn't show much to base a genetic analysis on IMO. </p><p></p><p>I've never heard of 20% of the national flock, or any individual flock, being culled for mastitis btw.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p></blockquote><p></p>
[QUOTE="neilo, post: 1838984, member: 348"] If, as normally happens with sheep, any that get mastitis are culled, everyone is already selecting hard against mastitis prone sheep. If they are removed from the gene pool with a trip to the abattoir, they don't get to breed many replacements. If BF levels are effecting growth rates (as would shown to be the case in Trident Feeds trials years back), that would be reflected in the 8 week wt ebvs. Personally, I would think getting a sample from every ewe without contamination would be anything but 'no more hassle than scanning'. I was involved in a Warwick Uni study into sheep mastitis a couple of years ago, where I collected samples from all sheep that got mastitis and from 20 or so that they wanted to investigate as well. It was a real PITA. Presumably you'd take several samples at weekly/monthly intervals to get a representative sample? In dairy cows, the scc changes according to stage of lactation, so one sample wouldn't show much to base a genetic analysis on IMO. I've never heard of 20% of the national flock, or any individual flock, being culled for mastitis btw.:eek: [/QUOTE]
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Cell counts in sheep
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