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
Health & Nutrition
Pregnancy rate
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="RonE" data-source="post: 606452" data-attributes="member: 9101"><p>This is a very confusing question, since the questioner asked about pregnancy rate</p><p>and every response referred to conception rate. I researched the question anyway</p><p>and came up with various answers such as "way below 25% per year" in the southern part</p><p>of the US. However, a 25%-30% preg rate is considered optimal at any given time over</p><p>a 21-day heat cycle for a given cohort. In the hotter parts of the US, conception rates,</p><p>and of course preg rates, are likely to be lower than in cooler parts.</p><p></p><p>The difference between preg rate and conception rate is this:</p><p></p><p>Conception rate is the number of cows found pregnant divided by the number of cows bred.</p><p>Preg rate is the number of cows found pregnant divided by the number eligible to be bred</p><p>over a 21 day heat cycle. Bred-eligible includes anaestrous cows even though they aren't</p><p>likely to be bred and won't "take" even if, as commonly occurs, they are raped numerous </p><p>times by a bull.</p><p></p><p>Increasing your preg rate is useful for shortening calving intervals and thus enhancing </p><p>reproductive success over a shorter period of time. Conception rate hasn't been</p><p>considered an important number for at least 6 or 7 years, I see it mostly being used</p><p>to measure the success of a particular AI breeder. Unfortunately, that number only depends</p><p>on how picky the breeder is. If he selects only the obvious standing heats to be bred,</p><p>then his conception rate will make him look really good. However, if he allows other,</p><p>"silent heat" and ambiguous heat cows to pass by the opportunity to be bred, then overall </p><p>preg rate will be lower as a result. So it seems that the more "successful" a breeder *appears* </p><p>at getting cows pregnant the less successful it is for the cattle operation as a whole,</p><p>since conception rate only considers cows that he bred and not the ones that he walked</p><p>past either on purpose (that one didn't *look* ready) or by mistake (oops!).</p></blockquote><p></p>
[QUOTE="RonE, post: 606452, member: 9101"] This is a very confusing question, since the questioner asked about pregnancy rate and every response referred to conception rate. I researched the question anyway and came up with various answers such as "way below 25% per year" in the southern part of the US. However, a 25%-30% preg rate is considered optimal at any given time over a 21-day heat cycle for a given cohort. In the hotter parts of the US, conception rates, and of course preg rates, are likely to be lower than in cooler parts. The difference between preg rate and conception rate is this: Conception rate is the number of cows found pregnant divided by the number of cows bred. Preg rate is the number of cows found pregnant divided by the number eligible to be bred over a 21 day heat cycle. Bred-eligible includes anaestrous cows even though they aren't likely to be bred and won't "take" even if, as commonly occurs, they are raped numerous times by a bull. Increasing your preg rate is useful for shortening calving intervals and thus enhancing reproductive success over a shorter period of time. Conception rate hasn't been considered an important number for at least 6 or 7 years, I see it mostly being used to measure the success of a particular AI breeder. Unfortunately, that number only depends on how picky the breeder is. If he selects only the obvious standing heats to be bred, then his conception rate will make him look really good. However, if he allows other, "silent heat" and ambiguous heat cows to pass by the opportunity to be bred, then overall preg rate will be lower as a result. So it seems that the more "successful" a breeder *appears* at getting cows pregnant the less successful it is for the cattle operation as a whole, since conception rate only considers cows that he bred and not the ones that he walked past either on purpose (that one didn't *look* ready) or by mistake (oops!). [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cattle Boards
Health & Nutrition
Pregnancy rate
Top