Yield, composition, fatty acid profile and CLA content of milk from goats fed with different levels of OPF

Abstract

The objective of this study was to evaluate the effect of different inclusion levels of OPF in total mixed ration (TMR)-based diet on yield, composition, FA profile and CLA content of milk in dairy goats. Six nulliparous female dairy goats (Saanen x Thai native, 19-21 months old, first lactation) were randomly set according to a 3x3 Latin square design with 2 replications for receiving diets consisted of 0% OPF (OPF0), 20% OPF (OPF20) and 40% OPF (OPF40). The average weight of the goats was 32.48±1.30 kg (mean±s.d.). The findings of this study showed that dry matter intake (DMI) and all nutrient intake of the goats increased significantly as OPF inclusion was increased (p<0.05), excluding crude protein intake (CPI) (p>0.05). Goats from OPF40 group had the highest CPI, however, there was no significant difference (p>0.05) in CPI of OPF20 and OPF0 groups. Feeding OPF altered the composition of protein and lactose, density and freezing point (p<0.05). However, it did not influence (p>0.05) the composition of fat, solid non-fat and minerals in the milk. There were no significant differences in oleic acid, dihomo-γ-linoleic acid, and eicosapentaenoic acid in milk fat of goats (p>0.05). 40% OPF inclusion increased the production of LnA, DHA, CLA and the ratio of PUFA:SFA; and lowered AA production and n-6:n-3 ratio of goat milk (p>0.05). It can be concluded that 40% OPF inclusion in TMR-based diet can be used as an alternative to producing goat’s milk with enriched potential health benefits.