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<blockquote data-quote="Ebenezer" data-source="post: 1563104" data-attributes="member: 24565"><p>Pathfinder is defined at 5 YO and 3 calves which excel in growth to weaning. A pathfinder is fertile to do that but you or I do not know how they are fed to be able to pull it off. It is a comparative within the herd and how the herd is fed and which sires are used on what cows. </p><p></p><p># embryos per cow is a heritable trait to daughters just as low #s of embryos is also heritable to daughters according to the Vet and folks who have done a lot of it. That is one reason some donors stay in programs as they are successful and other cows are as good or better but cannot be manipulated to deliver enough embryos to make it worthwhile.</p><p></p><p>SC and fertility of the bull. EXT was not known for the high SC EPDs. So it is not all correlated as tightly as we hope. </p><p></p><p>If fertility is only heritable at 11% per individual but we cull the worst of females do we not have odds to speed the process if we save daughters of the right cows, use short breeding windows on yearling heifers and do our homework on the bull selections? </p><p></p><p>Bonsma selection can also help. He also discussed cattle that have system problems earlier in life than others so that they quit functioning too soon. It's good not to set that up in a herd.</p></blockquote><p></p>
[QUOTE="Ebenezer, post: 1563104, member: 24565"] Pathfinder is defined at 5 YO and 3 calves which excel in growth to weaning. A pathfinder is fertile to do that but you or I do not know how they are fed to be able to pull it off. It is a comparative within the herd and how the herd is fed and which sires are used on what cows. # embryos per cow is a heritable trait to daughters just as low #s of embryos is also heritable to daughters according to the Vet and folks who have done a lot of it. That is one reason some donors stay in programs as they are successful and other cows are as good or better but cannot be manipulated to deliver enough embryos to make it worthwhile. SC and fertility of the bull. EXT was not known for the high SC EPDs. So it is not all correlated as tightly as we hope. If fertility is only heritable at 11% per individual but we cull the worst of females do we not have odds to speed the process if we save daughters of the right cows, use short breeding windows on yearling heifers and do our homework on the bull selections? Bonsma selection can also help. He also discussed cattle that have system problems earlier in life than others so that they quit functioning too soon. It's good not to set that up in a herd. [/QUOTE]
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