Holstein Early Onset Muscle Weakness Syndrome Test Results

Holstein Association USA has NOT declared this disorder as an officially recognized undesirable genetic condition and is referring to it as a “Genetic Condition Under Investigation.” For more information, click here for resources made available by our industry partners. 

At this time, you will not see an indication of carriers or non-carriers in the sire directory or websites. Once the industry has a plan to display this information, we will share that with you. As a member cooperative we want to be transparent with our farmer-owners and provide what information we have with you, so that you can make the best decisions for your herd. We are aggressively testing all sires. Below you will find the most current results. Please check back regularly as this list will be updated frequently. 

Genetic conditions of economic loss are not new to our industry. Public testing is readily available within the labs described in a statement from NAAB and more labs will soon also perform this service. If you are concerned about potential matings, testing your herd's most valuable females for this condition will help ease your mind. If females are not tested, making strategic decisions about all matings based on known sire stacked pedigrees will provide another level of safeguards and your Select Sires representative can help you with this. These methods, will allow the use of carrier sires that have extreme economic values, like those ranking high for Select Sires' Herd Health Profit Dollars™ (HHP$™) index, to drive more dollars into your genetic portfolio.

In the near future, Select Sires staff will begin work to include carrier/non-carrier information within the Select Mating Service^® SMS^® program to assist our farmer-owners in avoiding matings that may result in a calf affected with recumbency. As a federation, we stand prepared to assist you through this situation. Our goal remains to provide you with genetic advice to meet your breeding goals and to maximize herd improvement.

Table Key:

This table will be updated as new test results become available. Last Updated: September 20, 2023