Taken from the 2010 documentary The Private Life Of Cows, Jimmy learns how Bulls can detect when a cow is in heat, which only occur once every three .\r<br>\r<br>NDSU Extension beef specialist Carl Dahlen discusses artificial insemination on the beef industry, the estrous cycle and hormones. This is a recording from the .\r<br>\r<br>\r<br>\r<br>Video showing the 3 stages of estrus in cattle used to artificially inseminate cattle.\r<br>\r<br>This is a short video clip descibing heat detection in the college herd.
