Supplementation of dairy cow diets with docosahexaenoic acid enriched microalgae and its effecton milk fatty acid profile over time

摘要

The benefits of long chain fatty acids (FA) on human health have long been recognised, particularly the verylong chain n-3 polyunsaturated fatty acids (LC n-3 PUFA) such as DHA - C22:6n-3, (Marventano et al., 2015). Theprimary producer of LC n-3 PUFA at the bottom of the food chain is algae (ALG). The addition of dried ALG to the diet ofdairy cows has previously been shown to increase the content of LC n-3 PUFA in milk (Till et al., 2016). However,ruminal adaption to high levels of dietary PUFA can occur, altering the formation of specific biohydrogenationintermediates and potentially decreasing the amount of DHA available for secretion in milk (Shingfield et al., 2006),although little information is available for ALG. The objective of the study was to determine the effect of feeding DHAenriched ALG over time on the milk FA profile of Holstein-Friesian dairy cows.