Synchronization and AI Questions Answered

The other week we asked if you had any additional questions for Dr. Cliff Lamb regarding synchronization.  Below is his response to the question.

You can review previous posts here.

Q.) After starting a group of heifers on the 33 day TAI protocol, it was discovered that we need to breed 1 day early. Is it better to remove the CIDR on day 13 or give PGF 15 days(vs 16) after CIDR removal? How much would either change decrease or expected conception rate?

A.) There is no comparative data to know if there would be a decrease in fertility by limiting the CIDR to 13 days or reducing the interval from CIDR removal to 15 days.  However, I do not believe the fertility will decrease sufficiently with either option in a manner that it is noticeable to a producer.  However, given this scenario, I would elect to reduce the length of the CIDR to 13 days rather than reducing the interval from CIDR removal to PGF to 15 days.

 

Special thanks to Cliff Lamb and if you have further questions please send them our way and we will get them answered.

Cliff Lamb, Ph. D , is currently the Assistant Director and Professor at the University of Florida North Florida Research and Education Center in Marianna, Florida.  He graduated with a B.S. in Animal Science at Middle Tennessee State University. He received his M.S in 1996 and Ph. D. in 1998 at Kansas State University.  As Assistant Director of the North Florida Research and Education Center he oversees one of the largest beef cattle feed efficiency facilities in the world.  Dr. Lamb oversees a research program that focuses on applied reproductive physiology in beef cattle emphasizing efficient management systems for replacement heifers and postpartum cows. A primary research focus has been on the development of practical and economical estrous synchronization protocols for beef cows and heifers. He has also published numerous research articles on the use of ultrasound technology for reproductive management of beef cattle, and has a strong research background in embryo transfer technologies.  He is author of more than 60 refereed journal articles, 3 chapters in texts, and more than 200 presentations and articles in other scientific and popular press.

 

Highlights from Applied Reproductive Strategies in Beef Cattle Symposium 2013

Each year the Beef Reproduction Task Force and Beef Reproduction Leadership Team hold conference proceedings to present the latest research and value of synchronization in beef cattle.  Complete list of topics, speakers and summaries can be found here on the ARSBC News Room website (2013).

ABS Global strongly believes in the value of synchronization for beef cattle production and profitability.  A summary of key topics and take home messages follow.

Provided by Matthew Drebing, ABS Representative

• Fixed-time AI protocols are more reliable than ever, and there really isn’t a good excuse anymore to not utilize AI; time, labor, expense, and lack of facilities can all be overcome
• Producers have to be 90% accurate in their heat detection to achieve same accuracy of a fixed-time AI protocol
• A producer can front-load the calving season with fixed-time AI, accounting for up to 38 lbs. difference in weaning weight
• Errors in frozen semen handling can be more common and costly than handlers consider. Brad Stroud, DVM, Stroud Veterinary Embryo Services, Inc , emphasized the importance of keeping the temperature of straws below -130°C at all times. Each time cells are exposed or re-exposed temperatures higher than -130°C, ice crystals in the cells rearrange, leading to damaged membranes, which increases fertilization failure. Stroud also emphasized exchanging semen and going up and down within the neck of tank increases loss of semen quality. “It can only take 10 seconds in the neck of a half-filled Dewar for the internal temperature of a frozen semen straw to reach -100°C.” Stroud also emphasized the importance of quality semen from reputable large scale bull studs to ensure quality of handling and product.
• Larry Corah, Vice President of supply development for Certified Angus Beef LLC., highlighted the demand for premium-Choice and Prime is high and changing the market place. Corah also emphasized use of AI with proven genetics can help producers obtain higher quality levels that are capturing premiums
• Steve Hopkins, Virginia Cooperative Extension, in his talk about “How do I profit from improved reproduction” listed the ability to utilize AI to create uniformity as a way to create value in heifers, cows, and calves
• Randall Hinshaw, DVM.,  Ashby Embryo, provided additional reasons and support for rectal ultrasound; listing “Why Ultrasound:  more accurate, less invasive, confirm fetal viability, diagnose pregnancy earlier (25 days), diagnose fetal anomalies, understanding follicular dynamics, assess ovarian status before breeding AI

ABS offers expert knowledge to match synchronization systems to best fit your specific needs. You can confidently look to ABS Professionals to assist and help meet your operations’ needs at any herd size.  Contact ABS today to discuss options for your herd.

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