Pasture Breeding vs AI

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Well-known member
Jul 1, 2007
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North Carolina
Can any of you give me a sucess rate for breeding heifers with a bull vs using AI. Using a bull? I would think would be close to 100% but I am not sure. Looking forward to your comments.
Got 44% AI and 33% with cleanup bull in 60 day breeding season. Not very good with either. Good thing I only kept 9 heifers this year. 4 bred AI, 3 natural service, and 2 open.
If the bull is good and the heifers are in good shape and cycling there is no reason that you shouldn't get 95+%. However, a bull likely won't get them all bred in one cycle. With AI the success rate can be extremely high or extremely low. It depends on a number of factors including how well one heat detects, proper technique, proper placement, etc. There is no reason that a good experienced AIer shouldn't get 75% on the first cycle. Realize that it takes more labor to AI than to run a bull with the heifers. Many people will agree that the added genetic improvement from AI is worth the extra time and effort. I personally would AI heifers the first cycle or even two and then use a cleanup bull.
For first service conceptions it probably runs about the same. Remember that in the tradtional 45 day breeding season that give the tech or the bull 2 bites at the apple. I usually run close to 90% first service and 100% with a second service. This year I ran 94% but that is the exception. Based on the palp results the bull ran about 75% but he only got one shot at them too.
breesding heifers in true heat your conception rate should be then you should get the rest bred on the 2nd if 1 is open ship or put her with a bull.because with AI your only using a 42 to 56 day breeding season.

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