Where some of our best Texas Longhorn bulls are costing anywhere up to $250 a straw, we split the straws whenever possible. However, be aware, where a straw will usually contain up to 50 million "wigglers", splitting the straws means only half is inseminated into each cow's reproductive tract. Splitting straws seems to work best, esp with heifers which have a smaller tract than a mature cow. The problem with sexed semen is there are only 5 million cells are in a straw, (the heifer sexed semen that contains 10 million is actually intended for embryo transfer). That means reserve it for A.I.ing your heifers and splitting it isn't really a good choice. Statists show that with mature dairy cows (Holstein) with large reproductive tracts, sexed semen has only a 15 percent success rate-NOT Good. From what we understand dairymen are using it mostly with their heifers. But, there again Holsteins are larger and have a larger cavity than beef cows. If you synchronize and do everything right and they should come into standing heat at the same time, hopefully you can get 2 cows bred with one straw. Splitting it 3 ways is not advisable. Otherwise, the rule of thumb is expect to use an average of 1 1/2 straws per cow. But, if you don't breed in the window of 12 hours after standing heat, you may as well be squirting it on the ground. Timing is everything.
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