Beta-lactoglobulin / BLG A/B (PAEP-related) - Cattle

About beta-lactoglobulin

Beta-lactoglobulin, also known as BLG or β-lactoglobulin, is a major whey protein in cow’s milk. This analysis detects the A and B variants of the PAEP gene. These variants influence which beta-lactoglobulin protein a cow produces in her milk.

Milk protein variants are relevant for breeders and dairy producers because they can contribute to differences in milk composition, whey protein level, casein balance and technological properties of milk. The A variant is often linked to higher relative beta-lactoglobulin levels, while the B variant can be relevant for milk with relatively lower beta-lactoglobulin and more favourable casein/fat proportions for certain processing goals.

Practical value of this test

• A/A: the cow produces beta-lactoglobulin A.
• A/B: the cow produces a mixture of beta-lactoglobulin A and B.
• B/B: the cow produces beta-lactoglobulin B.

The result supports selection for milk protein profile, planned matings and strategic choices around milk production, processing quality and breeding goals.