Potential of chia oil to enrich goats' milk with omega-3 fatty acids in comparison to linseed oil under tropical climate

摘要

To study the potential of Chia oil to enrich goats' milk with omega-3 fatty acids in comparison to Linseed oil (LSO) under tropical climate, twelve lactating goats (Beetal) divided into 3 groups (on the basis of milk yield and parity) and were randomly assigned control diet or supplemented with Linseed oil (LSO) or Chia oil as additive at 1% of dry matter intake for 60 days. Dietary inclusion of Linseed or Chia oil didn't affect DM intake, apparent dry matter digestibility, pH or total volatile fatty acid production in dairy goats, however, acetate and butyrate in LSO group and ammonical-N in Chia group were higher than control. Similarly, no significant changes were detected for milk yield and milk composition, but values were numerically higher in LSO and Chia supplemented groups in comparison to control group. Inclusion of Linseed oil improved proportion of a-linolenic acid in milk fat. Moreover, eicosapentaenoic acid and docosahexaenoic acid were significantly improved in LSO group only. Poly unsaturated fatty acid content in milk varied from 3.09 g/100 g fat (control) to 3.86 g/100 g fat in LSO supplemented group but the differences were statistically non-significant. The proportions of omega 3 fatty acids was enhanced by 75.0 and 31.9% in LSO and Chia groups over control group that led to decrease in ratio of n-6/n-3 FA and desaturase index. It can be concluded that dietary inclusion of both oils improved the fatty acid profile of goat's milk, but Chia oil is not as effective as Linseed oil under tropical climate.