Dietary supplementation of dairy cows with a docosahexaenoic acid-rich thraustochytrid, Aurantiochytrium limacinum: effects on milk quality, fatty acid composition and cheese making properties
The aim of this study was to evaluate the effect of heterotrophically
grown docosahexaenoic acid (DHA)-rich thraustochytrid Aurantiochytrium
limacinum (AURA) added to dairy cow diet on milk fatty acid profile and milk
cheese making properties. The secondary aim was to investigate the effect of
pelleting on DHA transfer from diet to milk. Thirty six lactating dairy cows were
blocked by parity, number of days in milk and by milk production and randomly
assigned to 1 of 3 diets: AURA (150 g/cow/day) with protein concentrate in
pelleted or meal form, and control group – protein concentrate in pelleted form
without AURA. Milk samples from each cow were taken on days 0, 28, 56 and
84. Dietary supplementation for 84 days resulted in the successful enrichment
of milk with DHA, at a level of 4.47 and 6.37 mg/100 ml milk for the groups supplemented with AURA in a pelleted and meal form, respectively. As less DHA
was detected in the pelleted concentrate (470 vs 570 mg/kg), and subsequently
in the milk of the groups fed these pellets, the process of pelleting may have
resulted in a loss of DHA from the feed. Dietary supplementation with AURA
improved milk quality: increased DHA content and lowered n-6:n-3 ratio. With
no differences observed for the cheese making properties of milk from cows
fed supplemented or control diets, it can be stated that milk obtained from cows
fed diet enriched with DHA-rich thraustochytrid Aurantiochytrium limacinum at
a dose 150 g/cow/day (which gives about 24 g DHA/cow/day) can be suitable
for cheese production.
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