All Years Combined: Pregnancy rate for does in Heat Check group (35 of 66): 53%. 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. Third wheel: the insemination of elizabeth tchoungui. CIDR removed; intramuscular injection of 3 cc Lutalyse and 2. At the Upper Mountain Research Station, NCSU, NCA&TSU, and station staff conducted a demonstration and applied-research project using 38 Boer-crossbred does. 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. 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.
Intramuscular injection 1cc Cystorelin and AI. At about 50 and 85 days after artificial insemination, animals were checked for pregnancy status using transabdominal ultrasonography. Some advantages to timed AI include: - No heat checking is used. Frozen semen from a commercial company (Superior Semen Works, Milton, NH) was used for all AI, and motility of samples was confirmed for each straw. Pregnancy rates were higher for animals treated with the CIDR method (50%) than the NC Synch method (10. Third wheel: the insemination of elizabeth j. A successful ovulation synchronization program with timed AI would allow farmers to add new, higher-value genetics into their herd more efficiently than with estrus synchronization and traditional AI. Based on the research and demonstration work of Dr. Charlotte Farin and William Knox, North Carolina State University, and Dr. Niki Whitley, The Cooperative Extension Program at North Carolina A&T State University. Comparison of two ovulation synchronization methods for timed artificial insemination in goats. Not labeled for use in goats in the United States.
References (peer-reviewed abstracts): E. C. Bowdridge, W. B. Knox, C. S. Whisnant, and C. E. Farin. All animals were bred by timed AI on day 17. However, using timed AI (TAI) so that all animals are bred the same day without heat checking is even more efficient, saving time, money, and labor. Because exposure to buck pheromones can shift ovulation timing in does that have not been in prior contact with bucks (known as the buck effect), it is important to be sure that does are managed carefully when considering the NC Synch TAI protocol. Acknowledgments: Dr. Keesla Moulton, Elizabeth Bowdridge, Deanna Sedlak, Roberto Franco, Allison Cooper, Lorie Townsend, Ray Horton, and Joseph French. Third wheel: the insemination of elizabeth. These studies demonstrate the importance of making sure that AI occurs at the right time relative to the synchronized ovulation in TAI protocols. Estrus synchronization reduces the amount of time required for checking estrus (heat) before AI. 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). The same technicians did the inseminations (with equal numbers for each technician in each treatment group).
NC Synch 72: 21 does synchronized and bred by TAI, 11 does pregnant. Semen storage may not be needed. Does were housed together and were kept from sight, sound, and smell of all bucks until day 15 when all were allowed fence-line contact to an intact buck. NC Synch: A protocol for ovulation synchronization and timed artificial insemination in goats. This research was conducted for three years (2007 to 2010).
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. Pregnancy rate for does in NC Synch 72 group (11 of 21): 52%. The times between drug treatments were changed to better fit the reproductive responses of goats. The results are shown below: Heat Check: 22 does synchronized, 18 bred, 12 does pregnant. Half of the animals followed the Heat Check method described below: |. Intramuscular injection 3 cc Lutalyse. Pregnancy rates based on ultrasound at 50 and 85 days after breeding. Blood samples were collected 31 days after insemination to determine pregnancy status (BioPRYN® BioTracking, LLC). Whitley, N. C., C. Farin, W. Knox, L. Townsend, J. R. Horton, K. Moulton and S. Nusz. The NC Synch method was used with TAI and was developed based on Ov-Synch protocols used in cattle. The remaining does were bred using the NC Synch with TAI method described below: NC Synch with TAI Method. Heat Check (18-24 hr. All does were exposed to bucks via fence-line contact prior to the start of any treatments. Breed (AI) by AM-PM rule.
Year 3 (2009-2010): Heat Check: 25 does synchronized, 21 bred, 8 does pregnant.
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