Menu
Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Forums
Cattle Boards
Breeds Board
Can You Get Good Heterosis from a Crossbred Bull?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support CattleToday:
Message
<blockquote data-quote="WalnutCrest" data-source="post: 1490598" data-attributes="member: 21715"><p><a href="https://herdbook.org/simmapp/action/help.HelpAction?eventSubmit_displayHelpPage=T&helpId=121" target="_blank">I found what I was looking for.</a> and it lays it out like I thought ... a PB x. 3/4 = PB ... so, once an animal achieves PB status, it's worth 100% credit, same as a FB animal, in terms of a breed-up program of non-Simmental stock.</p><p></p><p>As a result, there is quite a bit of 'rounding up' in the breed-up program. This is not a unique trait of the Simmental Association; most continental breeds embraced the same protocol used here (I believe the Aubrac association is the only association of continental cattle that does something different). To wit, Simmentals say that:</p><p></p><p>3/8 x. 1/2 = 1/2</p><p>1/2 x. 5/8 = 5/8</p><p>5/8 x. 0 = 3/8</p><p>3/4 x. 3/8 = 5/8</p><p>...etc...</p><p></p><p>Drawn out over numerous generations using this approach, you'll find that PB animals bred up from other PB animals (which are then used to make more PB animals, etc.) as laid out in the above link will result in PB animals with less than 75% Simmental blood ... and therefore less heterosis than a commercial producer might expect. </p><p></p><p>This detail should also throw a bit of a kink in some of the more recent heterosis studies where PB animals are used (instead of FB animals) where the PB status was a function of similar breed-up programs.</p><p></p><p>...so, how would a PB be created if no other PB animals were used?</p></blockquote><p></p>
[QUOTE="WalnutCrest, post: 1490598, member: 21715"] [url=https://herdbook.org/simmapp/action/help.HelpAction?eventSubmit_displayHelpPage=T&helpId=121]I found what I was looking for.[/url] and it lays it out like I thought ... a PB x. 3/4 = PB ... so, once an animal achieves PB status, it's worth 100% credit, same as a FB animal, in terms of a breed-up program of non-Simmental stock. As a result, there is quite a bit of 'rounding up' in the breed-up program. This is not a unique trait of the Simmental Association; most continental breeds embraced the same protocol used here (I believe the Aubrac association is the only association of continental cattle that does something different). To wit, Simmentals say that: 3/8 x. 1/2 = 1/2 1/2 x. 5/8 = 5/8 5/8 x. 0 = 3/8 3/4 x. 3/8 = 5/8 ...etc... Drawn out over numerous generations using this approach, you'll find that PB animals bred up from other PB animals (which are then used to make more PB animals, etc.) as laid out in the above link will result in PB animals with less than 75% Simmental blood ... and therefore less heterosis than a commercial producer might expect. This detail should also throw a bit of a kink in some of the more recent heterosis studies where PB animals are used (instead of FB animals) where the PB status was a function of similar breed-up programs. ...so, how would a PB be created if no other PB animals were used? [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cattle Boards
Breeds Board
Can You Get Good Heterosis from a Crossbred Bull?
Top