GESTALAB Now available between tests!

                                                               Click image to enlarge
A New Reproduction Management Tool
When it comes time to evaluate whether or not your cow is pregnant, you need accurate information; and the sooner, the better. With GESTALAB, we are now offering you a new option for pregnancy detection.
There Is An Option For Every Situation
Between ultrasound and palpation by your veterinarian, blood tests and GESTALAB, you definitely are very well equipped to accurately detect pregnancies in your herd. It is up to you to choose which of these options suit your situation best, according to the size of your herd, your reproduction objectives or even your management habits.
For example, it may be to some producers’ advan­tage to have more rapid access to insemination results between two preventive visits by their veterinarian. In a free-stall herd, minimizing cow manipulation in pregnancy diagnosis could be very helpful.
A Closer Look at PAG

What is PAG?
PAG is an acronym for Pregnancy Associated Glycoprotein. These molecules are secreted by the placenta and then taken into the maternal circulatory system where we can detect them and use them as a pregnancy indicator in dairy cattle. Testing for PAG in blood samples has already been offered by some laboratories for several years now.

What does PAG do?
There have been many different hypotheses and researchers have attempted to verify some assumptions but, in reality, the function of PAG in pregnant cows is still unknown.
What we do know however is that PAG is very useful as a pregnancy indicator because any changes in the status of a fetus (ex. fetal mortality) are reflected by placental function and therefore in the expression of PAG.

Does PAG increase during pregnancy?
In fact, PAG levels vary throughout pregnancy and consequently the interpretation of PAG analysis results will also vary according to the stage of pregnancy. This is why it is so important to know the breeding date for every cow whose milk will be analyzed with GESTALAB.
The GESTALAB results will be sent to you in a report, included with the rest of your milk recording data. Here are some simple instructions to help you with the interpretation and use of your results.

If you see this result…
Good news! The test results indicate with certainty that your cow is pregnant at this time!
Probably pregnant:
The test has detected a PAG concentration that is high enough to presume that the cow is pregnant, but her unknown stage of gestation or breeding date does now allow us to confirm this without a doubt.
Better luck next time, the cow is not pregnant. She should be bred as soon as possible.
Probably open:
According to the test results, it seems that the cow is not pregnant, but this should be confirmed by an examination by your veterinarian.
Invalid test, missing information, interpretation not available, risk of embryonic loss or abortion, inconclusive, doubtful information:
It is possible that one of these results will appear on your GESTALAB report. In all of the cases above, additional information will be provided to help you to better understand the result and rectify the situation, if necessary.
Tips for the Optimal Use of GESTALAB
  1. ENSURE THAT THE CORRECT BREEDING DATE HAS BEEN ENTERED FOR THE COW THAT YOU WOULD LIKE TO TEST. This information is imperative to the proper interpretation of GESTALAB.
  2. DO NOT TEST THE MILK OF A COW THAT HAS BEEN BRED LESS THAN 28 DAYS BEFORE. The values obtained from milk that is analyzed before this, will not allow us to confirm a cow’s status with certainty (pregnant or open).  
What About Robots?
Milking robots are not all the same and each has its own sampling process. Before using GESTALAB, be sure to check with your Valacta technician to ensure that your brand of robot has undergone validation.  
Empty the Tube!
Did you know that you should always empty the lactometer tube (in com­pliance with recommended milk recording procedure) before moving on to the next cow? This is one of the strict sampling rules in milk recording. That being said, there will always be a little milk left at the bottom of the tube.
We have completed the necessary testing to verify the impact of this residual milk (or carry-over) on GESTALAB results and know that with conventional milking using a lactometer, if the sampling protocol is followed, there is no reason to doubt the validity of your results.

Ask your Valacta technician to review your sampling practices.
Although completely eliminating the residual milk in the lactometer is impossible, it is important to properly empty the tube between each and every cow.



     1. Xpresspost – Canada Post/From the post office

Hand your envelope to the clerk at the post office prior to the daily pick-up headed for the triage center so that the shipping delay can be met.

     2. Xpresspost - Canada Post/Mailbox

Drop your envelope in the mailbox prior to mail pick-up so that the shipping delay can be met.

     3. Ship-in-a-click – Canada Post/E-shipping tools  

Go to and get step by step instructions to help you prepare your shipment. It’s simple and easy to use!

     4. Through the CIAQ inseminator network.


GESTALAB by numbers... 

  • $per sample

  • > 99% pregnancy detection

  • 48 the number of hours
    between receiving the samples
    in the laboratory and receiving
    your results by Internet