| Autor: |
Ангелова, Теодора, Кръстанов, Живко, Йорданова, Даниела, Георгиева, Светлана |
| Předmět: |
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| Zdroj: |
Journal of Mountain Agriculture on the Balkans (JMAB); 2021, Vol. 24 Issue 2, p21-32, 12p |
| Abstrakt: |
The aim of the present investigation was to evaluate allele frequencies and genotypes of β- lactoglobulin (LGB) and their association with milk composition and milk coagulation properties in Brown cattle in Bulgaria. Milk proteins’ polymorphism was found out in 155 tissue samples from cows reared at 4 farms. Innovative protocols and techniques were used for determination of genetic polymorphism of β-lactoglobulin (LGB) in Brown cattle. After collection, tissue samples were shipped to the University in Padova, Italy The analysis of milk composition was done in the lab of the Agriculture Institute – Stara Zagora on Lactoscan ultrasound milk analyzer, whereas coagulation properties of individual milk samples were evaluated on a Computerized Renneting Metter – Polo Trade, Italy. Coagulation ability is characterized by three traits – RCT /rennet coagulation time, min./; a30 /curd firmness, mm/ и к20 /curd firming time, min/. The milk was analysed within 3 hours after sample collection. The frequency of allele B of β- lactoglobulin (LGB) was higher – 0.580. LGB is characterised with three genotypes – АА, АВ and ВВ, whose frequency varied within various ranges. Heterozygous cows with genotype AB produced milk with higher fat and protein content than the other two genotypes: 4.48% fat and 4.88% protein. The milk produced by cows from different LGB genotypes was characterised with moderate curd firmness and good rennet coagulation time. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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