No.
The Late Late Show with Craig Kilborn - 1999 2001-07-31 was released on: USA: 31 July 2001
We need WAY more information than this. These cows, are they all open, or did you buy them as bred stock? And are you sure these are cows, or are they weaned heifers? What breed are they? And where you are located? Assuming that you bought open (unbred) cows, the time you decide to breed them all depends on your location and what the climate and season is going to be around 9 to 10 months from now. Is it going to be too hot for the cows to be calving? Is calving season going to coincide with fly season? You will have to vaccinate your cows as well prior to a few months them giving birth, and vaccinations differ from region to region, so you will have to visit your local large animal vet for necessary vaccines to use on your new cows. Where you allow your cows to calve is important too. They should have access to sheltered areas like a shed or a grove of trees, and a large paddock that is big enough should one of them decide to go off on her own to calve out.
Late Show with David Letterman - 1993 2006-07-31 was released on: USA: 31 July 2006
Late Show with David Letterman - 1993 2000-07-31 was released on: USA: 31 July 2000
Late Show with David Letterman - 1993 1995-07-31 was released on: USA: 31 July 1995
Late Night with David Letterman - 1982 1991-07-31 was released on: USA: 31 July 1991
Late Night with Conan O'Brien - 1993 2007-07-31 was released on: USA: 31 July 2007
Late Night with Conan O'Brien - 1993 1995-07-31 was released on: USA: 31 July 1995
Late Night with Conan O'Brien - 1993 2008-07-31 was released on: USA: 31 July 2008
Late Show with David Letterman - 1993 15-152 was released on: USA: 24 July 2008 Australia: 26 July 2008 Sweden: 31 July 2008
Late Show with David Letterman - 1993 13-183 was released on: USA: 24 July 2006 Sweden: 31 July 2006
Late Show with David Letterman - 1993 16-182 was released on: USA: 24 July 2009 Sweden: 31 July 2009