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Cattle Boards
Breeding / Calving Issues
Heifer calves out of younger bull .
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<blockquote data-quote="Jeanne - Simme Valley" data-source="post: 1448995" data-attributes="member: 968"><p>I am a firm believer that the early bred AI does produce more heifer calves - but - you are also lowering your chance of conception. Some times the male & female sperm arrive with no egg "in sight" LOL</p><p>I was explained by an embryologist science research team doing early work on sexing semen -</p><p>The male sperm is more slender and swims faster than the fatter slower female sperm. The male sperm arrives and the egg has not been released. They die off, then the lazy fat females (no pun intended) arrive and the egg is waiting to be fertilized. But, if bred TOO early, they all arrive before the egg is released. What is too early??? that depends on each individual cow and her length of heat cycle. And, I don't know if the length of "hot heat" that we observe is indicative to the length of her release of egg.</p></blockquote><p></p>
[QUOTE="Jeanne - Simme Valley, post: 1448995, member: 968"] I am a firm believer that the early bred AI does produce more heifer calves - but - you are also lowering your chance of conception. Some times the male & female sperm arrive with no egg "in sight" LOL I was explained by an embryologist science research team doing early work on sexing semen - The male sperm is more slender and swims faster than the fatter slower female sperm. The male sperm arrives and the egg has not been released. They die off, then the lazy fat females (no pun intended) arrive and the egg is waiting to be fertilized. But, if bred TOO early, they all arrive before the egg is released. What is too early??? that depends on each individual cow and her length of heat cycle. And, I don't know if the length of "hot heat" that we observe is indicative to the length of her release of egg. [/QUOTE]
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Breeding / Calving Issues
Heifer calves out of younger bull .
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