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Livestock
Livestock & Forage
ebv debate
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<blockquote data-quote="Global ovine" data-source="post: 1880742" data-attributes="member: 493"><p>This balance had always bothered me until I went through my SIL Dam Summaries (annually updated eBV and Index performance ranked from the best to the worst) looking at the proportion of "Grand Matriarchs" (those that recorded 7 and more lambings). I drew a line through the Dam Summary list annually at a point where my replacements were a better bet than those ewes that had performed worse. Therefore I was concerned that I may have had too few remaining to get any sort of a handle on longevity. Here the Eureka moment commenced. The majority of highly influential sires came from such "Grand Matriarchs". It was surprising to see the number of later proven top daughters and sons out of then two tooth dams, these dams then went on to a great age and maintained huge production. I then dismissed any concern about ewes being burnt out because they had high production. If their constitution was doubtful at a younger age they were culled. The influence of ewes with a short breeding life and average or worse production is negligible within a flock.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 1880742, member: 493"] This balance had always bothered me until I went through my SIL Dam Summaries (annually updated eBV and Index performance ranked from the best to the worst) looking at the proportion of "Grand Matriarchs" (those that recorded 7 and more lambings). I drew a line through the Dam Summary list annually at a point where my replacements were a better bet than those ewes that had performed worse. Therefore I was concerned that I may have had too few remaining to get any sort of a handle on longevity. Here the Eureka moment commenced. The majority of highly influential sires came from such "Grand Matriarchs". It was surprising to see the number of later proven top daughters and sons out of then two tooth dams, these dams then went on to a great age and maintained huge production. I then dismissed any concern about ewes being burnt out because they had high production. If their constitution was doubtful at a younger age they were culled. The influence of ewes with a short breeding life and average or worse production is negligible within a flock. [/QUOTE]
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