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