Article from ABGA magazine "The Boer Goat" - Jan/Feb 2001 By Dr. Stuart Southwell,
B.V.SC. - M.R.C.V.S. Premier Genetics NZ Ltd. - Drury, New Zealand
The best way to spread elite genetic material throughout a population is by AI. Semen
can be collected from top sires, frozen, then transported throughout the world, where
it can influence large populations.
The Boer goat industry is essentially in its infancy, but when top sires are able
to be identified, their genetics can be spread effectively by AI. I believe the Boer
goat industry will use AI as a technique for spreading genetics more in the future,
whereas it is now more dependent on embryo transfer.
Some Important Facts About AI
Obtain frozen semen from a reputable source. - There is large variability in the
number of live sperm obtained upon thawing. Have yor frozen semen checked.
Rules of Probability.
If using fresh semen, good results can be achieved with cervical insemination. Best
results are from natural heats, followed closely by synchronized heats. What you
should expect to achieve - 65% pregnancy rate.
Frozen semen should only be used for laproscopic insemination. Cervical inseminations
are too variable. However, some operators do achieve good results off natural heats.
From a practical point of view, if you are going to use frozen semen, then synchronize
your does and inseminate laproscopically. anticipated pregnancy rate - 60%.
When to Inseminate - Inseminate approximately 12 hours after the first sign of oestrous.
If the does are in season in the morning, inseminate in the evening. In season in
the evening, inseminate the following morning.
Doe Management - Female goats must be prepared carefully prior to insemination. Does
must be run together at least six months prior to programming. If they have kids
at foot, these must be weaned two months before insemination. DO NOT mix groups of
does just prior to programming, as it won't work. Two weeks before the commencement
of the program, teaser bucks should be run with the does. This will stimulate oestrous
and hence begin the reproductive mechanism. At the onset of the program does need
to be nutritionally "flushed." This continues through to insemination and is maintained
until 40 days past insemination. The doe will be gaining weight over this period
and will have greater pregnancy rates by doing this than is she had not been flushed.
A Typical AL Program Would be as Follows:
Day 1 - Insert CIDR
Day 17 - CIDR Out
Day 19 - Heats
The use of P.M.S.G. is debatable. Out of season situations do require the use of
P.M.S.G. Dose rates are 150 I.U. to 400 I.U per goat. This is normally given at CIDR
Out. In-season situation - I don't recommend the use of P.M.S.G. as I feel it reduces
the pregnancy rate. Good management will give good results.
About the Author
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 pi9oneering many of the embryo transfer
techniques and program 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.
Dr. Stuart Southwell can be contacted at Premier Genetics, NZ Ltd. Ingram Road, RD
3 Druary, NZ Phone 0-9 236-0616