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Livestock
Livestock & Forage
ebv debate
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<blockquote data-quote="Ysgythan" data-source="post: 1881436" data-attributes="member: 8724"><p>I've never done that exercise but it chimes with our experience. When we are looking for ET donor ewes we look for ewes that have performed the best in their first few lambings because ewes that do the job tend to keep doing the job. </p><p></p><p>A prominent Scottish breeder told me he'd looked at the flock book and all the most influential rams were by ram lambs out of first time dams. It's worth keeping the breeding stock young therefore, but I think it's a waste not to get as many females out of the star performers over the following years as you can. </p><p></p><p>I suppose another issue I have with the 40% thing is that good flocks will be culling ewes between 30-40% for the sake of it that are better for the breed than the top 10% sheep of a poor flock.</p></blockquote><p></p>
[QUOTE="Ysgythan, post: 1881436, member: 8724"] I've never done that exercise but it chimes with our experience. When we are looking for ET donor ewes we look for ewes that have performed the best in their first few lambings because ewes that do the job tend to keep doing the job. A prominent Scottish breeder told me he'd looked at the flock book and all the most influential rams were by ram lambs out of first time dams. It's worth keeping the breeding stock young therefore, but I think it's a waste not to get as many females out of the star performers over the following years as you can. I suppose another issue I have with the 40% thing is that good flocks will be culling ewes between 30-40% for the sake of it that are better for the breed than the top 10% sheep of a poor flock. [/QUOTE]
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