Pig International - November 2012 - 25

| 25

This sow was injected with a dye using the AMG catheters.
The dye advanced up both horns to the uteral tubal junction
instantaneously without any injury to the sow.
plug of bacteria is actually re-deposited
at the very beginning of the cervix.
The only substance entering a sow
or gilt's reproductive tract is what
is inside the semen container.
Figure 1 is a picture of a parity 4
sow's reproductive tract. This sow
was injected with a dye using the AMG
catheters. After injecting the dye,
the reproductive tract was removed
and opened. The dye advanced
up both horns to the
uteral tubal junction
instantaneously without
any injury to the sow.
Figure 2 also is of a
parity 4 sow bred using a
traditional foam tip pipette.
The majority of semen
is trapped in the cervix
and some has advanced
a short distance up the
horns. The semen still has
a long way to travel before reaching the
uteral tubal junction awaiting ovulation.
It's important to note that most of the
semen will die along this journey due to
Phagocytosis. The immediate injection
of semen into the uteral tubal junction
allows for very low concentrations of
spermatozoa to be used successfully.

A parity 4 sow bred using a traditional foam tip pipette.
The majority of semen is trapped in the cervix and some has
advanced a short distance up the horns.

where genetic material is delivered
into the reproductive tract.
The volume of the extended dose of
semen used in IUI or DIUI inseminations
still plays a critical role. In nature, a
normal pig ejaculate is 250-300ml (on
average), which is already far more than
today's standard of 70-80ml. An adequate
volume of fluid is needed to carry the
spermatozoa to the sow's uteral tubal
junction, especially in older parity sows.

Advances in artificial
insemination 
"The role of artificial insemination
in delivering the 'best of the best'
genetics - and farrowing rates of
up to 95 percent - is already firmly
established as pivotal to the success of
the pig industry," says Stephen Waite,
head of science at JSR Genetics. "Can
Research and Development yield real
positive benefi ts? In our experience,

❱❱ Some of the concerns over deep
insemination catheters have been the
potential damage to sow's reproductive tract
using the long rod attached to the catheter. ❰❰

Low-dose inseminations 
While many in the pig industry
talk about low-dose inseminations,
it's important to discuss how and

November/December 2012 | www.WATTAgNet.com

Maintaining a volume of 70ml when
extending semen, even in the lower
concentrations, allows for a hydraulic
catheter to carry the semen to its final
destination the uteral-tubal junction.
Reducing the concentration of spermatozoa
to 400 million and the extended solution
below 70ml is not recommended, the
same as repacking pig semen into
two new containers resulting in 35mls
each is not recommended. For optimal
results discuss the lower concentration
doses with your genetic supplier.

the answer would be yes. One such
project is the viability of offering sex
selected semen, which would be a huge
step forward for the pig industry. The
potentially achievable, and preferable,
split would be eight gilts to two boars."
"Once we can ascertain an optimal
low dose for pigs - and we suspect
this may be around 400 million -
we will carry on our work with the
University of York, who are currently
involved in research with flow cytometer
manufacturers, to make that dose as easy


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Table of Contents for the Digital Edition of Pig International - November 2012

Contents
Pig International - November 2012 - Cover1
Pig International - November 2012 - Cover2
Pig International - November 2012 - Contents
Pig International - November 2012 - 2
Pig International - November 2012 - 3
Pig International - November 2012 - 4
Pig International - November 2012 - 5
Pig International - November 2012 - 6
Pig International - November 2012 - 7
Pig International - November 2012 - 8
Pig International - November 2012 - 9
Pig International - November 2012 - 10
Pig International - November 2012 - 11
Pig International - November 2012 - 12
Pig International - November 2012 - 13
Pig International - November 2012 - 14
Pig International - November 2012 - 15
Pig International - November 2012 - 16
Pig International - November 2012 - 17
Pig International - November 2012 - 18
Pig International - November 2012 - 19
Pig International - November 2012 - 20
Pig International - November 2012 - 21
Pig International - November 2012 - 22
Pig International - November 2012 - 23
Pig International - November 2012 - 24
Pig International - November 2012 - 25
Pig International - November 2012 - 26
Pig International - November 2012 - 27
Pig International - November 2012 - 28
Pig International - November 2012 - Cover3
Pig International - November 2012 - Cover4
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