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At NCSU, Boer does that had kidded at least once before were assigned to either traditional estrus synchronization with AI following heat checking (Heat Check) using the AM-PM rule (if in estrus AM, breed PM, and vice versa) or the ovulation synchronization method with timed artificial insemination (NC Synch). Estrus synchronization combined with artificial insemination (AI) is used regularly in cattle and has been useful for breeding management. All breeding can occur on a single day that is selected by the farmer and/or AI technician, allowing for purchase and use of semen without long-term storage. Comparison of two ovulation synchronization methods for timed artificial insemination in goats. Half of the does underwent the NC Synch method developed at NCSU as described above, and the other half underwent a CIDR method as follows: CIDR ®* Method. Whitley, N. Third wheel: the insemination of elizabeth in rugen. C., C. Farin, W. Knox, L. Townsend, J. R. Horton, K. Moulton and S. Nusz.
All does were exposed to bucks via fence-line contact prior to the start of any treatments. The times between drug treatments were changed to better fit the reproductive responses of goats. All animals were bred by timed AI on day 17. Year 3 (2009-2010): Heat Check: 25 does synchronized, 21 bred, 8 does pregnant. These studies demonstrate the importance of making sure that AI occurs at the right time relative to the synchronized ovulation in TAI protocols. References (peer-reviewed abstracts): E. C. Bowdridge, W. B. Knox, C. Third wheel: the insemination of elizabeth city. S. Whisnant, and C. E. Farin. NC Synch 72: 21 does synchronized and bred by TAI, 11 does pregnant. At about 50 and 85 days after artificial insemination, animals were checked for pregnancy status using transabdominal ultrasonography. In recent research and demonstration projects at North Carolina State University (NCSU) and North Carolina A&T State University (NCA&TSU), ovulation synchronization methods for timed AI were compared. Estrus synchronization reduces the amount of time required for checking estrus (heat) before AI. These technologies would also be useful for goat farmers interested in using AI to increase the genetic merit of offspring. The same technicians did the inseminations (with equal numbers for each technician in each treatment group). The key for effective timed AI is the s ynchronization of not just estrus but also of ovulation (egg release). At the Upper Mountain Research Station, NCSU, NCA&TSU, and station staff conducted a demonstration and applied-research project using 38 Boer-crossbred does.
Data on kidding, including number of females kidding to AI breeding date, number of kids born, number of kids born alive, and twinning rate, were recorded. Semen storage may not be needed. A follow-up study was conducted at NCSU using 87 Boer and Boer-crossbred does that were divided into four treatment groups: Heat Check method described above, CIDR Method described above, NC Synch with TAI at 48 hours after the second Lutalyse injection (NC Synch 48) and NC Synch method with TAI at 72 hours after second Lutalyse injection (NC Synch 72, the NC Synch protocol used previously). These benefits allow for lower-cost, more efficient AI technology adoption. The NC Synch method was used with TAI and was developed based on Ov-Synch protocols used in cattle. The results are shown below: Heat Check: 22 does synchronized, 18 bred, 12 does pregnant. Differences between years is not surprising given differences in weather and other variables that can change from year to year, though the exact reason for the much lower rates in Year 3 is not known. If an AI technician is being hired, a single trip can be scheduled. The low pregnancy rates associated with the NC Synch method in the Upper Mountain Research Station study may have resulted from an early ovulation in this group of does that had not been exposed to bucks prior to the start of the experiment.
Acknowledgments: Dr. Keesla Moulton, Elizabeth Bowdridge, Deanna Sedlak, Roberto Franco, Allison Cooper, Lorie Townsend, Ray Horton, and Joseph French. CIDR removed; intramuscular injection of 3 cc Lutalyse and 2. NC Synch: A protocol for ovulation synchronization and timed artificial insemination in goats. After the artificial insemination breeding period, all animals were returned to the flock and managed through the standard operating procedures for the farm. Pregnancy rate for does in NC Synch 72 group (11 of 21): 52%. This research was conducted for three years (2007 to 2010).
Intramuscular injection 1cc Cystorelin and AI. Pregnancy rates were higher for animals treated with the CIDR method (50%) than the NC Synch method (10. Not labeled for use in goats in the United States. Breed (AI) by AM-PM rule.