Factor affecting the 3' sialyllactose, 6' sialyllactose and disialyllactose content in caprine colostrum and milk: Breed and parity.

tThe fraction of oligosaccharides (OS) in goat milk is becoming increasingly important for its bio-functionalrole. OS profile of goat milk shows more similarity to human milk in comparison to bovine and ovinemilk, in addition goat milk contains sialylated OS which play an important role in brain development andincrease immunity in infants.In the first study, in order to improve the knowledge on breed effect on sialyloligosaccharides (SOS),we have focused on three of the most representative SOS; 6sialyllactose (6-SL), 3sialyllactose (3-SL) and disialyllactose (DSL) in colostrum and milk from Saanen goats, a cosmopolitan breed, and fromGarganica goats, native breed. Successively, we compared the SOS levels in colostrum and milk of Saanengoats in two different parity. The results showed a significant effect of breed on SOS content (P < 0.05)and a significant interaction breed × sampling time occurred for 3-SL (P < 0.001) and 6-SL (P < 0.01).Concerning parity, a significant effect was found only for the 3-SL content (P < 0.05). The present findingis particularly relevant in order to preserve and improve native breed production in view of a sustainableland use.