Current
Visitors
23
COVER PAGE
PREVIOUS
DISPLAY
 Related Articles

EMBRYO TRANSFER IN THE BOER GOAT

Dr. Stuart Southwell, B.V.Sc - M.R.C.V.S.
Premier Genetics NZ. Ltd. - Drury, New Zealand

Commercial embryo transfer in goats in New Zealand began in 1973, with the introduction of Angoras into the country with the expectations of Mohair. Initial methods were based around recovering embryos by fallopian tube flushes on the third or fourth day after mating. Those efforts were often variable in their recoveries, and if not done correctly caused permanent damage to the reproductive tract. Stimulation of the ovaries was by P.M.S.G. (Pregnant Mare Serum Gonadatropin) or F.S.H. (Follicle Stimulation Hormone), or a combination of both. Oestrous was normally surpressed by daily injections of Progesterone. A typical programme then was similar to this:

Day 1 thru Day 15: - Daily Injections Of Progesterone (12.5 mg per day)
Day 16 thru Day 19: - F.S.H. Injections, Twice Daily
Day 20 - Bucks And Donor Does Were Mated
Day 24 - Embryos Were Receovered And Transferred To Surrogates

Variability was the main complaint, which may have been the programme, or the recovery method.

Recovery rates were improved dramatically by retreiving embryos on the 6th or 7th day after mating. Flushing took place at the fallopian/uterine junction, which also reduced surgical trauma seen previously. F.S.H. stimulation proved more consistent than P.M.S.G., and is now used exclusively. F.S.H. products available in the marketplace include: F.S.H.-P, Folltropin, Ovagen, Pluset, Super-Ov, and Ova-Plus.

Generally, as pertain to goats, F.S.H. products that are low in L. H. (Lutenizing Hormone) perform better than those with higher L.H. As the L.H. content increases, so does the variability in results increase. Dose rates of 20-25mg should be given to each donor over a three or four day period, at 12 hour intervals.

Oestrous suppression is now conveniently achieved by use of an intra-vaginal device called a CIDR. In the goat, these will suppress oestrous quite adequately for an 18 day period (ie: from CIDR in, to superovulation). Changing the CIDR prior to superovulation is not necessary.

A Standard Programme Today Is:

Day 1 - CIDR IN
Day 17 - F.S.H. A.M. - F.S.H. P.M.
Day 18 - F.S.H. A.M. - F.S.H. P.M.
Day 19 - F.S.H. A.M. - F.S.H. P.M.
Day 20 - F.S.H. A.M. - CIDR OUT A.M. - F.S.H. P.M
Day 21 - MATINGS
Day 26 - EMBRYO RECOVERY & TRANSFER

Variations to this programme are because of:

1) Age of donor
2) Time of year
3) Use of fresh or frozen semen

Boer Goat Management:

These animals are sensitive to change. In order to acclimatize the Boer for embryo transfer procedures that are going to take place during the programme, any changes in environment, feeding, or handling must be presented to the animal well beforehand. (ie: grouping donors together, etc.) A lot of thought must be given to the pre-programming care of this animal. It will perform exceptionally well or not at all. This is dependent upon the owner's management.

Expectations:

An adult Boer doe will, on average, produce 13 useable embryos, with a possible range of between 0 and 53. A seven month old Boer doe kid will produce, on average, 8 useable embryos, and can range from 0 to 28. Note that yields in the zero range are usually the result of poor management.

Pre-mature Luteal Regression:

Pre-mature luteal regression, a syndrome that is not uncommon in Boer goats, is caused by stress. Prostaglandin is released soon after ovulation causing the developing corpus luteum to regress pre-maturely. By Day 6, the corpus is regressed, and normally embryos are not recovered.

Embryo Splitting:

Embryo Splitting has only recently become commercially viable in the goat. Approximately 50% of embryos recovered are suitable for splitting. The pregnancy rates from these demi-embryos are similar to fresh whole embryos (ie: 70-80% scanned foetuses to embryos implanted), and it has now become very economic to use embryo splitting as a procedure.

Plan Ahead & Closely Follow Proven Procedures:

The absolute key to a successful embryo transfer in Boer goats is to think well ahead, not 4 weeks, but 4 months. What we have learned from many years of practice, is that the most successful results are achieved by those who closely follow the proven protocol, as setforth in this paper.


About The Author

Dr. Stuart Southwell, B.V.Sc - M.R.C.V.S.
Premier Genetics N.Z. Ltd.

No one individual has contributed more to the development of the international Boer goat industry than Dr. Stuart Southwell of Premier Genetics N. Z. Ltd in Drury, New Zealand. He is widely known and respected for pioneering many of the embryo transfer techniques and programme protocols that are being employed by veterinarians and goat producers in many different countries of the world, and has willingly shared his knowledge and experience with those who have sought his advice and counsel. In addition to sharing his surgical techniques with other of his fellow veterinarians, Dr. Southwell has, himself, performed embryo recovery, splitting, and transfer on many thousands of Boer goats.

A brief history of his role in the development and propagation of the Boer goat on an international basis can be found elsewhere at this site, in an article by him that is entitled "The Boer Goat Becomes International". Also of possible interest is his paper entitled "Artificial Insemination In The Boer Goat".

To confer with Dr. Southwell regarding Boer goat embryo transfer or AI technology, or to engage his services, you may contact him as follows:

Dr. Stuart Southwell, B.V.Sc - M.R.C.V.S.
Premier Genetics NZ, Ltd.
Ingram Road
R. D. 3
Drury, New Zealand

Phone: 0-9 236 0616
Fax: 0-9 236-0327


 

DISCLAIMER

GoatGateway.com and it's agents and sponsors are not responsible for the content of advertisers' sites or advertised claims.

GoatGateway.com does not act as an agent for buyers or sellers. GoatGateway.com does not in any way influence or control transactions for goods or services between buyers and sellers.

USE

Information on this web site is offered by persons who are NOT veterinary professionals except where noted.
The information contained on this web site is based on the knowledge and understanding of the author at the time of first publication. However, because of advances in agriculture related fields, users are reminded of their personal responsibility to ensure that information upon which they rely is up to date and to CHECK accuracy and currency of the information WITH YOUR VETERINARIAN for specific health and nutrition advice.

ALWAYS READ THE LABEL
Users of medical and chemical products must always read the label and strictly comply with directions on the label. Users are not absolved from compliance with the directions on the label by reason of any statement made, or omitted to be made, on this web site.

TRADEMARKS

The boergoats.com logo is a registered trademark of KLS Boer Goats.
The following are trademarks or service marks of KLS Boer Goats.

OnLine Show
GoatGateway
BoerGoats.com
MeatGoats.com
GoatClassifieds
ShowMeatGoats
ShowWethers.net
BoerGoat101.com
GoatBreeders.com
BoerGoats.comCHAT
The Show Wether Center
Where The Bucks Meet The Bucks
The Boer & Meat Goat Information Center