A2/A2 Milk Gene

We test our Dexters for the A2/A2 milk gene

Information on the A2/A2 milk Gene

 According to UC Davis Veterinary Medicine, “The solids found in cow’s milk are composed of fat, protein, lactose and minerals. Beta-casein is one of six milk proteins and is produced by the CSN2 gene. Twelve genetic variants of CSN2 are known which cause changes of certain amino acids in the beta-casein protein and alter its properties. These variants can be classified into 2 groups (A1 and A2) which code for different amino acids at one specific site in the gene. Milk containing A2 beta casein is considered to have health benefits.” ( http://www.vgl.ucdavis.edu/services/A2Genotyping.php , retrieved April, 2013)

Tests results from University of California, Davis and Texas A& M

Results Interpretation Code Chances
Homozygous A2 variant “Cows with this variant produce the A2 form of the milk protein   B-casein. The A2 form has been associated with lower risk of heart disease   and childhood diabetes” Texas A& M A2/A2 “2 copies of A2 present. If bred to other A2/A2 animals, only   A2/A2 offspring will be produced.” University of California, Davis
Carrier for A2 Variant Carries 1 copy of the A2 variant for beta casein, and one non-A2   variant.” Texas A&M A2N or A1/A2 “1copy of A2 present. If bred to A2/A2 animals, 50% of offspring   will be A2/A2.” University of California, Davis
Non-A2 variant Produces a non-A2 form of the beta casein protein in milk NN or A1/A1 “No copies of A2 present.” University of California, Davis

 

What this means to you. Breeding for the A2/A2 milk gene:

Animal Breeding for A2 and A1 milk gene

Animal Bred

Animal Bred

Results in Percentage

A1/A1

A1/A1

A1/A1

100%

A2/A2

A1/A1

A1/A2

100%

A2/A2

A2/A2

A2/A2

100%

A1/A2

A1/A1

A1/A1

50%

A1/A2

50%

A1/A2

A1/A2

A1/A1

25%

A1/A2

50%

A2/A2

25%

Leave a Comment

Current day month ye@r *

CommentLuv badge