Blood samples were collected 31 days after insemination to determine pregnancy status (BioPRYN® BioTracking, LLC). All Years Combined: Pregnancy rate for does in Heat Check group (35 of 66): 53%. Third wheel: the insemination of elizabeth. Estrus synchronization reduces the amount of time required for checking estrus (heat) before AI. Pregnancy rates were higher for animals treated with the CIDR method (50%) than the NC Synch method (10. Some advantages to timed AI include: - No heat checking is used.
The times between drug treatments were changed to better fit the reproductive responses of goats. 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 barrett. 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. Half of the animals followed the Heat Check method described below: |. At the Upper Mountain Research Station, NCSU, NCA&TSU, and station staff conducted a demonstration and applied-research project using 38 Boer-crossbred does. These technologies would also be useful for goat farmers interested in using AI to increase the genetic merit of offspring.
Pregnancy rate for does in NC Synch 72 group (11 of 21): 52%. 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. After the artificial insemination breeding period, all animals were returned to the flock and managed through the standard operating procedures for the farm. The key for effective timed AI is the s ynchronization of not just estrus but also of ovulation (egg release). 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. Year 3 (2009-2010): Heat Check: 25 does synchronized, 21 bred, 8 does pregnant. 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. NC Synch: A protocol for ovulation synchronization and timed artificial insemination in goats. The results are shown below: Heat Check: 22 does synchronized, 18 bred, 12 does pregnant. Whitley, N. C., C. Farin, W. Knox, L. Townsend, J. R. Horton, K. Third wheel: the insemination of elizabeth i 1562. Moulton and S. Nusz. Comparison of two ovulation synchronization methods for timed artificial insemination in goats. Not labeled for use in goats in the United States. The remaining does were bred using the NC Synch with TAI method described below: NC Synch with TAI Method. Acknowledgments: Dr. Keesla Moulton, Elizabeth Bowdridge, Deanna Sedlak, Roberto Franco, Allison Cooper, Lorie Townsend, Ray Horton, and Joseph French.
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). NC Synch 72: 21 does synchronized and bred by TAI, 11 does pregnant. Pregnancy rates based on ultrasound at 50 and 85 days after breeding. All animals were bred by timed AI on day 17. Breed (AI) by AM-PM rule. At about 50 and 85 days after artificial insemination, animals were checked for pregnancy status using transabdominal ultrasonography. Intramuscular injection 3 cc Lutalyse. This research was conducted for three years (2007 to 2010). 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. Semen storage may not be needed.
If an AI technician is being hired, a single trip can be scheduled. CIDR removed; intramuscular injection of 3 cc Lutalyse and 2. All does were exposed to bucks via fence-line contact prior to the start of any treatments. 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. Heat Check (18-24 hr.
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. The same technicians did the inseminations (with equal numbers for each technician in each treatment group). Estrus synchronization combined with artificial insemination (AI) is used regularly in cattle and has been useful for breeding management. 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). The NC Synch method was used with TAI and was developed based on Ov-Synch protocols used in cattle. 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.
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