Fatty acid content in milk of dairy cows on a diet with high fat content derived from rapeseed
Komprda, T.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin)E-mail:[email protected] | Dvorak, R.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic)) | Fialova, M.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Chemie a Biochemie) | Sustova, K.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin) | Pechova, A.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic))
Two groups of dairy cows, Czech Red Pied x Ayrshire x Red Holstein crossbreds, received a diet with either rapeseed, rapeseed cakes and rapeseed oil (Energol; E-group; final feed mixture with 62 g of crude fat per kg of dry matter, DM), or with control production mixture (C-group; crude fat content in total feed mixture 37 g/kg DM). The groups did not differ in either milk yield or yield of milk fat, milk protein and lactose. In both groups, lactose, Ca, milk protein and casein concentrations increased significantly and linearly with the increasing day of lactation. Casein concentration in E-milk was significantly lower than in C-milk. Dietary rapeseed significantly decreased palmitic acid concentration and increased oleic acid concentration; the ratio of total C16/total C18 fatty acids was consequently twice lower in E-milk. The concentrations of linoleic, alpha-linolenic and eicosapentaenoic + docosahexaenoic acids were significantly higher in E-milk.
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