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Cattle Boards
Breeding / Calving Issues
Calving 2023
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<blockquote data-quote="Travlr" data-source="post: 1787054" data-attributes="member: 42463"><p>Yeah, feeds affect the PH in the uterus ([USER=968]@Jeanne - Simme Valley[/USER] mentions this), which affects the environment the sperm need to swim through. Male sperm and female sperm have different rates if survival over time as well as differing motility. Male sperm swim faster but play out faster, and female swim slower and go for longer. Different PH affects how thin or thick the uterine medium is. High mineral and protein favors male sperm and higher carbs favors female. This also influences the bull, so both cows and bulls benefit from focused feed management in gender results.</p><p></p><p>There are other things you can do too. For females you can AI in the uterine horn that is NOT ovulating. Body temps can be monitored, which I've never done so don't know enough to advise you. Early breeding just before ovulation favors females.</p><p></p><p>None of these things are 100%. They only increase the percentages. It's been a while but if I remember right one gender averages 67% and the other 72%... so not a lot but worth it if you specialize in selling bulls or replacement heifers.</p></blockquote><p></p>
[QUOTE="Travlr, post: 1787054, member: 42463"] Yeah, feeds affect the PH in the uterus ([USER=968]@Jeanne - Simme Valley[/USER] mentions this), which affects the environment the sperm need to swim through. Male sperm and female sperm have different rates if survival over time as well as differing motility. Male sperm swim faster but play out faster, and female swim slower and go for longer. Different PH affects how thin or thick the uterine medium is. High mineral and protein favors male sperm and higher carbs favors female. This also influences the bull, so both cows and bulls benefit from focused feed management in gender results. There are other things you can do too. For females you can AI in the uterine horn that is NOT ovulating. Body temps can be monitored, which I've never done so don't know enough to advise you. Early breeding just before ovulation favors females. None of these things are 100%. They only increase the percentages. It's been a while but if I remember right one gender averages 67% and the other 72%... so not a lot but worth it if you specialize in selling bulls or replacement heifers. [/QUOTE]
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