Influence of beta-lactoglobulin genotypes on the nitrogen distribution in the total protein and technological properties of milk from the improved Valachian sheep | Vplyv genotypov beta-laktoglobulínu na zloženie bielkovinového komplexu a technologické vlastnosti mlieka oviec zošľachtená valaška
2010
Michalcová, A., University of Technology and Life Sciences, Bydgoszcz (Poland) | Krupová, Z., French National Institute for Agricultural Research, Paris (France)
The aim of the work was to search genetic polymorphism of beta-Lg and its effect on the total milk protein, nitrogen distribution in the total protein and technological properties of milk collected from Slovak Improved Valachian breed sheep. Totally, 166 milk samples were analyzed for whole milk protein, nitrogen distribution in milk, technological properties of milk (pH, calcium content, rennetability, heat stability). The genotypic frequencies at the beta-Lg locus, estimated by RLFPPCR, detected for the Improved Valachian sheep were 0.29 (AA); 0.45 (AB); 0.26 (BB). No statistically significant effect of the genetic variant of beta-Lg for the nitrogen distribution in the proteins was found. However, statistically significant differences in the average calcium content (P less than 0.05) between the genotypes AB and BB and in rennetability (P less than 0.05) between the genotypes AA and BB were found. Using a two-way ANOVA analysis, we have determined the effect of the lactation period on the crude protein nitrogen, true protein nitrogen, casein and casein number (P less than 0.01) and on the heat stability and rennetability (P less than 0.05).
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