Fat
In milk fat is, the main source of energy. Goat and cow milk
are low in polyunsaturated fatty acids that are necessary
for. Human metabolism (Grand-Pierre et al, 1988). Fat is
present in milk in the form of an emulsion of fat cells; the
concentration. Of the fat content of milk can be found in
small cells suspended in water which varies considerably
by race and composition. Of feed.The unsaturated FATTYACIDS are lipid molecules containing at least one double
bond according to, the structure of this. Or of these double
bonds. It is possible to distinguish the cis fatty acids and
trans fatty acids (Figure 1). Most unsaturated. Fats in our
diet are in the, cis form and a lower proportion are in the
trans form (Stender, and Dyerbery 2003). The fat. Content of
.Goat milk is slightly greater than that of, cow milk in both
cases; triglycerides represent more than 95% of total lipids.
Phospholipids. Comprise 30 to 40 mg / 100 ml of cow milk
which contains 8 to 10 mg of lipid cholesterol is, from 10 to
20 mg per, 100 ml. Most of which is in the free form (Table
5).
During the homogenization of milk the fat, globule
.Increases in number and considerably decreases in
diameter (less than 1 micron). Therefore the contact, area
increases. About 20 times. This change prevents fat from
rising (in the long-life milk) and promotes digestion. The
lipid composition. Of milk includes two major groups:
simple lipids (triglycerides) and complex lipids
(phospholipids). The milk fat has a. Nutritional role by
energy, intake9 kcal / g as dietary, lipids (Florence 2010). It
also has a role in the construction of the body; we tend to
charge animal. Fat of all disadvantages but experts, point out
that health risks exist only if consumption is excessive.
Finally milk,, Fat provides essential vitamins to the body:
vitamins A and D above; Vitamin A is essential to the epithelia hence its,, Role in,, reproduction vision while
.Vitamin D is essential in the binding of calcium and bone
growth. Fat milk therefore has a place in, the diet but it
must. Be reasonable: high energy value as all, lipids;
presence of saturated fatty acids, and cholesterol harmful in
high doses.? Milk fat therefore has a place in, the diet but it
must be reasonable as all lipids contain saturated fatty
acids, and cholesterol. Harmful in high doses.The fat has a
very important sensory role during tasting; it gives a
creamy texture appreciated smooth and velvety,,,,, fondant
etc. On the, other hand many flavors are associated with fat;
it intervenes, in intensity balance after taste, of these
aromas.? The reduction or elimination of lipids from dairy
products will therefore require, technological
improvementsTo keep the finished products familiar
organoleptic qualities. Fat plays an important role in
determining the flavor and. Texture of the finished product.
It conditions the use of additives and ingredients to
compensate for its absence. It also. Determines the
spreadability of butters and spreads; it depends on the fatty
acid composition and is, heavily dependent. On animal
nutrition and season.Butter is richer in unsaturated fatty
acids when the animals eat green fodder; hence butter, is
less soft (harder during.) Winter because animals, feed
primarily on grass or hay. Note that the fat globules are
separable by microfiltration and. Fractional crystallization
making, it possible to obtain products with a specific
character. Fat globules have a different. Composition
.Depending on their size of AG. It should be remembered
that only physical processes are allowed for the
transformation. Of milk fat. Lipids are also subject to
changes related to temperature changes, during storage for
example. Table 6 lists. The main chemical changes that must
be taken into account in the choice of process technology
and the use of additives such. As antioxidants (Mireille
., 2006).
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