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    Why is semen taken from cows which will be used for artificial insemination, stored in liquid nitrogen?

    Whats bad/good about artificial insemination?

    Thanks!!
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    (Original post by sloaney87)
    Why is semen taken from cows which will be used for artificial insemination, stored in liquid nitrogen?

    Whats bad/good about artificial insemination?

    Thanks!!
    I never knew you could extract semen from cows :confused:
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    (Original post by Ralfskini)
    I never knew you could extract semen from cows :confused:
    this is kinda question that u will get in triple paper
    Genetic
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    (Original post by Ralfskini)
    I never knew you could extract semen from cows :confused:
    Lol, cheeky bugger

    Erm.. liquid N2 to keep the cells alive I guess: I suppose at such low temperatures the chemical reactions will be slowed right down so their lives will be extended.

    Artifical insemination:
    Bad = 'unnatural'; possibility of choosing genetic makeup of offspring which can be considered immoral, erm...
    Good = can get round some possible infertility problems I guess; you know exactly which bull the semen has come from (though I'd guess you normally would by mating a cow and bull anyway)

    - this is all what I could come up with on the spur of the moment so it's mostly educated guesswork; you might want to try having a look on the internet (Google is wonderful). Good luck
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    Yup, you can extract the sperm by using a fake female rump!!!! Did you see Malcolm in the Middle. It sooooo strange that they make us learn this. :confused:
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    not really selective breeding is an important part of chemistry, especially in today's world
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    Adv.
    1) One bull can be used to inseminate a large no. of females
    2) Speeds up progeny testing and selective breeding
    3) Sperm can be checked for genetic defects and sexed
    4) It is safer for the farmer and his workers if there is no bull on site and saves the farmer the cost of keeping a bull
    5) There is no stress from matings and transporting animals for matings
    6) Artificial insemination is quickly available when it is needed
    7) Different bulls can be used to inseminate different cows therefore hopefully reducing the chance of inbreeding occuring

    Dis adv.
    1) Frozen sperm and low temperature storage can damage sperm
    2) There is the chance of inbreeding with it's resulting problems if one bull is used to inseminate a large no. of females
    3) If the bull that has inseminated a large no. of females is discovered to have a genetic defect, the cost will be huge
    4) Ethical objections - some ppl feel that it is wrong to put the animals through such an unnatural process and that is shows a lack of respect to them

    Cheers, you've helped me with my revision, done that from memory (I'm doing 'Applications of genetics' module so have to know all this c*ap)
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    does anyone know this:

    Describe in a detail a method you could use to count the number of living bacteria in a sample of water..
    (is that the mthod using agar jelly??)
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    erm use dilution plating or the good ol' haemocytometer i think.

    for haemo, dilute a number of times then place sample of known volume into the haemocytometer, count the cells, do the maths and work out how many in original sample.
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    Is this an optional module?
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    and one more..

    decribe how large amounts of human growth hormone can be made from genetically engineered bacteria.
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    identify gene for growth hormone

    isolate it then chop the gene out of the DNA using restriction(?) enzymes

    use same restriction enzymes to cut open a circular plasmid. Insert gene then use DNA ligase to 'glue' the plasmid back together.

    Insert plasmid into bacteria.

    Grow bacteria in fermenters and extract product.
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    thanx
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    (Original post by sloaney87)
    Why is semen taken from cows which will be used for artificial insemination, stored in liquid nitrogen?

    Whats bad/good about artificial insemination?

    Thanks!!
    nitrogen is to keep it really cold and alive

    it's good because you don't have to transport cows/bulls around and can inseminate thousands of cows from one lots of semen, but bad because this can lead to inbreeding.
 
 
 
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