Where Are We?
Buying a Liquid Nitrogen (Semen) Tank
How Many Straws?
The main question to answer
before purchasing a semen tank is how
many straws will be stored. You must
remember that a tank with a 500 straw
capacity may only hold that many if they
are packed at the lab. If the canes are
tight fitting you may not get them back
into the canister after pulling a straw
to breed a cow. On average a 500 straw
capacity tank with 6 canisters will
actually hold about 400 to 450 straws
comfortably. The larger the canister
size the closer to the advertised
holding capacity. The larger diameter
canister has a less severe curve and
lets the canes fall back into them
It is important to understand that many
people underestimate the capacity they
will need. In only a few years time you
will accumulate semen because of various
sales and the use of newer bulls. You
may want to keep the older semen you
have to use at a later date and over
time the tank becomes crowded. Also, you
may have purchased only a few straws of
one bull but it will take up the room of
ten straws because they are on a 10
straw cane. Overestimate the size you
feel you will need and avoid being one
of the folks that calls me a year later
saying "I should have gotten the bigger
Under 500 units to store?
If you want to store under 500 straws
you will want to look at any of the
tanks in the 20 to 22 liter range. These
are the least expensive of all the tanks
available, are very efficient and
portable. There are smaller tanks out
there but they are used for shipping and
have a specially designed internal
component that absorbs liquid nitrogen.
The addition of this material makes this
tank more expensive. If you want to
store under 500 straws and
Cost is the main
issue we recommend the
All liquid nitrogen tanks must be filled
periodically as the liquid evaporates
and the level in the tank becomes lower.
Cost of filling a tank varies from
region to region and can be quite
expensive in some areas.
The longer the holding time a
tank has the more time between fills.
When looking at specifications on the
Static Time is the amount
of time a tank will hold liquid if it is
completely full of liquid nitrogen and
is allowed to evaporate without pulling
out the cork.
is the length of time a full tank will
become completely empty if it is used on
a daily basis (i.e. during breeding
season). The more often the cork is
pulled and semen removed the shorter
time between fills. If you want to
store less than 500 straws and
Holding Time is
the main issue we
What is the Difference?
main question I get about the MVE line
of tanks refers to the 20 liter series.
The MVE SC20, XC20, and SC20/20 look
almost identical. The SC20 and XC20 are
identical except for the canister size.
Usually you will see a difference in
price between the two tanks from other
distributors but we purchase them at the
same price and in turn sell them at the
The SC20/20 is an older version of these
two tanks and is actually a bit more
expensive to produce due to the
different style lid. In my opinion
there is no realized gain by the old
style lid so there is no real value in
picking this tank over an XC20.
We do stock all three simply because
some folks don't do their own research
and end up buying whatever their
neighbor has in the barn.
There are many tanks on the market but
only a few brands that will have
increased resale value based on the
name. Of course all tanks lose value in
time but if you may be selling your tank
within a few years this is an important
Resale Value is the main issue
MVE Brand. Check out the
section to see how well the MVE tanks
hold their value as opposed to other
Vapor shippers are a
completely different type of tank.
Basically built to save on shipping
costs, these compact tanks are used to
ship semen around the world.
They are named such because of an a
built in lining that actually absorbs
the liquid nitrogen. This allows the
tanks to be shipped as non-dangerous
goods which saves on shipping costs.
Vapor shippers have a short hold time
and limited capacity. They are designed
to lay on their side but
are the box or container used to protect
the vapor shipper during transit. The
design of any good shipping jacket will
not allow the tank to be turned upside
down at any time. Shipping companies are
not at all interested in keeping your
tank right side up so be sure you only
ship in a container that prevents any
vapor shipper from being transported
Shippers come in several sizes but the
main tanks we use are the
MVE SC4/3 and the
MVE SC4/2. The SC4/3 holds 4
liters of nitrogen for 3 weeks and the
SC4/2 holds 4 liters of nitrogen for 2
Damon, Texas 77430