Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58, 137-154
Published online 2014-08-06

Relationship between concentration of health important groups of fatty acids and components and technological properties in cow milk

Oto Hanuš1, Eva Samková2, Jiří Špička2, Kamila Sojková3, Kristýna Hanušová3, Tomáš Kopec4, Marcela Vyletělová3, Radoslava Jedelská3

1Research Institute for Cattle Breeding Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Czech Republic
2University of South Bohemia České Budějovice, Faculty of Agriculture, Studentská 13, 370 05 České Budějovice, Czech Republic
3AgroResearch Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Czech Republic
4Czech Fleckvieh Breeders Association, Horní 28, 591 01 Žďár nad Sázavou, Czech Republic

Groups of fatty acids (FAs) in milk fat can have positive and negative impact on consumer health. Profile of FAs could be influenced by dairy cow nutrition, breed, milk yield level et cetera. The question is what relationships the FAs could have to quality of milk products? Relationships between FAs and their groups to selected milk indicators were studied in Czech Fleckvieh and Holstein cows (64 bulk milk samples). There were 8 herds in 2-year investigation during winter and summer season. The relationship of saturated FAs (SAFA; 66.22%) was significant only to lactose (L) content (0.290; P < 0.05). The relationships of monounsaturated FAs (MUFA; 29.21%) to milk indicators (MIs) were in­si­gni­fi­cant (P > 0.05). The relationships of polyunsaturated FAs (PUFA, beneficial for consumer health; 4.53%) to MIs were narrower: fat (T, 0.321; P < 0.05); lactose (L, 0.458; P < 0.01); milk alcohol stability (AL, 0.447; P < 0.01); titration acidity (SH, 0.342; P < 0.01); cheese curd quality (KV, 0.427; P < 0.01); milk fermentationability (JSH, 0.529; P < 0.001), streptococci count in yoghurt (Strepto, 0.316; P < 0.05); total count of noble bacteria in yoghurt (CPMUK, 0.314; P < 0.05); streptococci/lactobacilly ratio (StreptoLacto, 0.356; P < 0.01). The relationships of conjugated linoleic acid (CLA; markedly beneficial for health; 0.68%) to MIs were: T (0.379; P < 0.01); L (–0.542; P < 0.001); AL (0.266; P < 0.05); KV (0.411; P < 0.01); Strepto (0.260; P < 0.05); StreptoLacto (0.270; P < 0.05). The higher CLA levels were connected in this way with: higher fat content; lower lactose content; lower alcohol stability; lower streptococci count in yoghurt; lower streptococci/lactobacilly ratio in yoghurt. The PUFA and CLA representation decreased with L increase. Simultaneously some technological milk properties such as alcohol sta­bi­li­ty and fermentationability were slightly improved.


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