R350 Double Muscling


An abnormal increase in the volume of muscle fibers is the cause of Muscular Hypertrophy (in contrast with Muscular Hyperplasie, in which the increase in muscle is caused by the number of muscle fibers). The genetic factor results in addition of about 20 percent muscle, resulting in higher carcass yield combined with leaner meat. The genetic factor is indicated as mh, and occurs frequently in Piedmontese and Belgian Blue cattle. In other breeds however, the same increase in muscle has been seen. In addition to the clear advantages, several disadvantages originate from e.g. complications at birth. In a random selection of double-muscled cattle, at least 7 genetic variants have been seen in the mystatin-gene. Genetic identification of mh is very complex.

Test specific information



The genetic factor is continuously present, and will always be visible.

Turn Around Time

The turn-around-time of a test depends to a large extent on the logistics of sample transportation to the laboratory. After receiving the sample at the test location, you can normally expect the result within 10 working days. A longer delivery time applies to tests carried out by a Partner Lab.

Location of disease or trait

The genetic factor has an effect on muscle. Depending on the effect, increase of muscle volume and quality may take place.

Breed dependence

This DNA test is available for the following breeds: Belgian Blue, Piedmontese. Additional information is available in the Frequently Asked Questions (FAQ).

Sample type

For this DNA test we accept the following materials: Hair, Semen, Blood EDTA, Blood Heparin, Tissue. Please contact Dr. Van Haeringen Laboratorium if you wish to submit other material as listed.


An animal can be free and has in that situation two healthy alleles. When used in breeding this animal will not become ill due to the disease. It cannot spread the disease in the population.

An animal can be carrier and has in that situation one healthy and one disease allele. When used in breeding 50 percent of the offspring will receive the disease allele. Carriers will not become ill.

An animal can be affected and has in that situation two disease alleles. When used in breeding all offspring will also receive the disease allele. Affected will become ill.


This genetic factor is inherited in an autosomal, recessive, mode. This means, that the individual can be free of the disease (homozygote normal), affected (homozygous affected) or carrier (heterozygous).

Carriers may spread the mutation in a population without showing symptoms themselves. Because of this, it is extremely important to identify carriers correctly to prevent spreading of a mutation.

Severity of Disease

Genetic characteristics are not a disease.

Code R350

Double Muscling

€ 69,25 (excl. VAT)