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
Breeding / Calving Issues
Cows determine the sex
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="RVF" data-source="post: 530407" data-attributes="member: 7960"><p>Bigbull388, I like your logic, unfortunately it does not work that way. The bulls sperm determine the sex of the calf through what are called the X and Y chromosome. All females have 2 X chromosome while all males have an X and a Y. If the sperm has an X chromosome then the calf will be a heifer. If the sperm has a Y chromosome then the calf will be male. So the effect will not be passed down through the generations. </p><p></p><p>Evidently the sperm with the X chromosome is heavier than the sperm with the Y chromosome. Therefore, it is beleived that the male sperm can swim faster and get to the site of fertilization sooner than the female sperm. However, the male sperm is also suppose to die sooner than the fermale sperm. This has led some producers, dairy in particular, to AI a little soon than recommended to try and shift the ratio in favour of heifers. I do not know if it works. If the above is true, logically it would follow that a cow who ovulates sooner in the heat cycle relative to standing heat would tend to have more bulls as compared to cows who ovulate later in the cycle.</p></blockquote><p></p>
[QUOTE="RVF, post: 530407, member: 7960"] Bigbull388, I like your logic, unfortunately it does not work that way. The bulls sperm determine the sex of the calf through what are called the X and Y chromosome. All females have 2 X chromosome while all males have an X and a Y. If the sperm has an X chromosome then the calf will be a heifer. If the sperm has a Y chromosome then the calf will be male. So the effect will not be passed down through the generations. Evidently the sperm with the X chromosome is heavier than the sperm with the Y chromosome. Therefore, it is beleived that the male sperm can swim faster and get to the site of fertilization sooner than the female sperm. However, the male sperm is also suppose to die sooner than the fermale sperm. This has led some producers, dairy in particular, to AI a little soon than recommended to try and shift the ratio in favour of heifers. I do not know if it works. If the above is true, logically it would follow that a cow who ovulates sooner in the heat cycle relative to standing heat would tend to have more bulls as compared to cows who ovulate later in the cycle. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cattle Boards
Breeding / Calving Issues
Cows determine the sex
Top