AI Semen Sales

We have semen straws available for purchase from the following outstanding Dexter bulls.  Click on any bull’s name to see detailed information about him & more photos.

You may order straws from multiple bulls to make up the 10 straws for a quantity discount.  An order of straws from these bulls can be combined with an order from Belle Fourche Farm for a single shipment from the same storage facility.  Ordering information is at the bottom of this page.  You may contact us at to arrange your order.

Belle Fourche Rousseau, our foundation herdsire

Belle Fourche Rousseau, our foundation herdsire

Belle Fourche Rousseau

An excellent, red, homozygous polled bull.

Registered ADCA & PDCA
Sire & Dam Qualified, genotype on file at TAMU & UCD

Tested negative for Trichomoniasis

10% discount for 10 or more


Mrald Perfect Lil Milkman

Mrald Perfect Lil Milkman, 2 1/2 years old

Mrald Perfect Lil Milkman

A very nice, small-statured, polled bull.
Red with HOMOZYGOUS dun

Registered ADCA
Sire & Dam Qualified, genotype on file at UCD

Tested negative for TB, Brucellosis, BVD, Lepto (5 strains) and Trich

$55/straw for 10 or more ($5/straw discount)


Straws from Milkman will also be available locally for pick-up at Emerald Park Farm, for those in the Seattle, WA area.



Artificial Insemination Basics

We often are asked questions about how this all works.  Here is some of the basic information you need to know before getting started with AI.

Ordering Straws:  Most people want to order at least 2 straws per cow, in case a cow doesn’t settle on the first try.  Extras can be kept in storage for use at a later date.  We do not have a minimum order, but shipping is expensive so it’s better to buy more for one shipment than to have to buy & ship more a second time.  We will need to know how many straws you want from what bull, as well as your name & phone number.

Shipping & Storage:  Straws are shipped frozen, in a nitrogen tank, from the storage facility.  You will need to have them shipped to your AI tech or vet who will be doing AI for you, so they can store the straws in their own nitrogen tank until your cow is ready to breed.  Have this person’s shipping address & phone number available when you arrange shipping with the storage facility.

Payment:  You will need to pay us for the straws you are ordering.  Once we receive payment, we will release the straws to you with the storage facility.  Then you will need to contact the storage facility to arrange & pay for the shipping, which can be done with a credit card over the phone.

Breeding Your Cow:  You will have to be able to tell when your cow is in standing heat & ready to breed.  AI is usually done 12 hours after the beginning of standing heat.  If you have more than one bovine, you can use a heat detection patch, like Estrotect stickers, to determine when your cow is standing to be mounted.  If you only have one cow & can’t tell when she is in heat, then you may have to talk to your vet or AI tech about doing a synch protocol with hormone injections.