Naslov
Effects of the β-lactoglobulin genotype on milk production parameters of Jezeropivska sheep breed

Autori
Đokić, Milena ; Marković, Božidarka ; Gantner, Vesna ; Marković, Milan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts - GEA (Geo Eco-Eco Agro) / Spalevic, V. - Podgorica : GEA (Geo Eko-Eko Agro), Faculty of Architecture - University of Montenegro, Faculty of Philosophy - University of Montenegro, Biotechnical faculty - University of Montenegro, 2020, 204-204

ISBN
978-86-86625-27-4

Skup
GEA (Geo Eco-Eco Agro) International Conference

Mjesto i datum
Podgorica, Crna Gora, 28.05.2020. - 31.05.2020

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Jezeropivska sheep ; milk yield ; milk composition ; β-lactoglobulin ; genotype

Sažetak
Effects of β-lactoglobulin (β-Lg) genotypes on milk traits (duration of lactation and milk yield) and milk composition (content of fat, protein, lactose and solids nonfat - SNF) of a Montenegrin autochthonous sheep breed were studied. The study was carried out on 44 ewes of Jezeropivska sheep breed. This is the most numerous autochthonous breed of sheep in Montenegro, which is traditionally raised in mountain area of Durmitor and Sinjajevina, and partly in the central part of the country. According to the recent investigations, genetic polymorphisms in β-Lg, a major whey protein in milk of ruminants, are closely related with milk production parameters and technological properties. Polymorphisms within ovine β-Lg gene were detected using PCR-RFLP method - RsaI restriction endonuclease. Two genetic variants (A and B) and three genotypes (AA, AB and BB) of β-Lg were identified. The analysis showed a prevalence of strong A allele (0.63) compared to the weak B allele (0.38), while the frequencies of genotypes were 0.364, 0.523 and 0.113 respectively. Milk yield and milk composition parameters were obtained by using the standard procedures of milk recording during lactation. There were no statistically significant differences in duration of lactation and total milk yield between these three genotypes, while daily milk yield was significantly influenced (p<0.05) by genotypes. Study showed that variant B of β-Lg was linked with higher milk production. Daily milk yield was the highest (0.70 kg) in ewes of BB genotype β-lactoglobulin than AB (0.60 kg) and AA (0.54 kg) genotype. The effect of genotype of β-Lg on protein and lactose content were significant (p<0.05), while it is not significantly influenced fat and solid non-fat content. In Jezeropivska sheep breed genotype AA was linked with the higher protein content (5.86%). The protein content in the milk of AB and BB genotype was the same (5.64%). Significant association between AB genotype of β-lactoglobulin gene with higher lactose content (4.67%) was found. The results presented in this study could be useful in improvement of the concept of conservation and sustainable use of this autochthonous sheep breed, while gene of β-Lg as a potential marker in improving milk traits of sheep.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija), Biotehnologija

POVEZANOST RADA