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Agricultural News

Are the Replacement Heifers Ready for the Fall Breeding Season?

Tue, 15 Sep 2015 15:37:49 CDT

Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist, writes in the latest Cow-Calf Newsletter.


Fall-calving herds will be breeding replacement heifers in late November. Now is the time to make certain that those heifers are ready for the upcoming breeding season.


Immunize the heifers. Ask your large animal veterinarian about proper immunizations for yearling replacement heifers. Replacement heifers should be immunized for respiratory diseases such as IBR and BVD.   Consider giving the heifers a modified live vaccine for longer lasting protection against these viruses. The heifers should receive this vaccination at least one month before the start of the breeding season. This would also be a good time to include other reproductive disease protection that may be recommended by your veterinarian. Examples of other immunizations that should be considered include leptospirosis and campylobacter (sometimes called vibriosis).


If a set of scales is available, weigh the heifers. There is time to make adjustments to the supplementation being fed to the heifers to insure that they meet the target weight at the start of the breeding season. To be certain that a high percentage of heifers are cycling at the start of the breeding season, they must weigh a minimum of 60% of their mature weight (Davis and Wettemann). See OSU Research Report 2009. If these heifers will eventually grow into 1200 pound cows, then they must weigh 720 at the beginning of the estrous synchronization and artificial insemination (or bull turn-out if natural breeding is used). Calculate the weight gain needed between now and the start of the breeding season to see if additional energy is required to achieve the desired weight gain.

 

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