Fatty Acid Profile and CLA Content of Goat Milk: Influence of Feeding System

Abstract

There is great interest in producing bioethanol from biomass and there is much emphasis on exploiting The effect of pasture and of diet linseed supplementation on fatty acid profile of milk was evaluated using 45 pluriparous goats, equally divided after kidding into three homogeneous groups (H, P and L). Group H (control) and L were housed in a stall receiving alfalfa hay, while group P was led to pasture. The groups received concentrate which for group L had linseed as ingredient. Average milk yield did not statistically differ between the groups. Groups P showed significantly higher fat content than group H and L (4.62% vs 3.70%, and 3.90% respectively for groups P, H and L; P < 0.01). On the contrary, milk from goats of group H and L had significantly higher content of lactose (4.65% and 4.61% vs 4.57%, respectively for groups H, L and P; P < 0.05). The levels of C18:1 cis9, C18:1 trans11 and MUFA in milk were significantly (P < 0.05) increased by both the pasture and linseed, while linoleic acid (C18:2) and PUFA were significantly (P < 0.05) higher in group P compared either to H or to L groups. The highest values of CLAs, either as t11 CLA and t10 c12 CLA or as CLA, have been registered in milk of group P, the lowest in group H. These parameters in milk of group L were significantly (P < 0.05) lower or higher than those of group P and H, respectively.

Differences on Biochemical Composition of GoatMilk at Carpathian Breed and Half Breed Saanen X Carpathian and French Alpine X Carpathian

“…The lipids from goat's milk contain several hundred fatty acids of whose percentage from the total of fatty acids varies considerably [9]. Medium-chain triglycerides normally reach a percentage of 36% in milk goat in comparison with 21% in cow milk, thereby reducing the synthesis of endogenous cholesterol [10].…”

Conjugated linoleic acid: A potent fatty acid linked to animal and human health

“…Tudisco et al (2014) who evaluated the effect of pasture on the fatty acid profile of goat milk reported that goats on pasture showed higher amounts of CLA in their milk in comparison with the control animals. It is well documented that although dietary supplementation of CLA for dairy ruminants can increase the amounts of CLA in their milk, CLA has a reducing effect on milk fat of dairy ruminants, especially cows and sheep which has been mostly attributed to a decrease in biosynthesis of lipids.…”

Effects of Pre-milking Resting on Some Lactation Characteristics of Damascus (Shami) and Kilis Goats

“…This situation is consistent with the report made by Güler et al (2007) that informed significant changes in the fatty acids except of short-chain fatty acids during lactation for the German Fawn x Hair goat crossbreds and Shami goats. Similarly, Tudisco et al (2014) reported that fatty acids of goats' milk were changed as a function of sampling month. Fatty acids up to partly C16 are de novo synthesized within the mammary gland from acetate and butanoate produced by rumen bacteria.…”

“…In contrast to the previous study for Shami breed (Güler et al, 2007) octadecanoic acid in milk of all groups during the trial was significantly higher than its unsaturated isomers such as 9-octadecenoic and 9,12-octadecadienoic acids. Tudisco et al (2014) and Sanz-Sampelayo et al, (2007) reported that predominant FFA with 18 carbons was octadodecanoic acid in goat milk and its unsaturated isomers could be dependent mostly on the pasture and also the activity of desaturase enzyme in mammary cells of ruminants since this enzyme could be converted saturated C18 to unsaturated C18 isomers. However, cyclopropene acids found in some plants are inhibited to enzyme activity (Wastra, et.al., 2006).…”