G. Flachowsky et al., INFLUENCE OF FEEDING OF OILSEEDS AND BY-P RODUCTS FROM OILSEEDS ON VITAMIN-E CONCENTRATION OF ANIMAL PRODUCTS, Fett, 99(2), 1997, pp. 55-60
In 5 feeding studies dairy cows, beef cattle and pigs were fed diets w
ith different contents of oil seeds or oil seed expellers. Thus, the e
ffects on vitamin E concentration in animal products were analyzed aga
inst a reference diet, which was free from these components. Dairy cow
s received 1 kg full fat rapeseed (430 g fat; 31 mg alpha-tocophherol/
kg DM). Beef cattle were fed rations with 7, 14 and 21% rapeseed and p
igs were administered concentrates containing 10% rapeseed, 20% full f
at soybeans or 5 and 10% false flax expeller. Feeding full fat oilseed
s or their expellers resulted in an increased fat and alpha-tocopherol
intake. Incorporating full fat rapeseed into the diets induced a sign
ificant increase of vitamin E-concentration in milk and other body sam
ples. In contrary to this increase expeller feeding caused a decreased
vitamin E-concentration in animal products. The fatty acids pattern o
f the oilseeds and the expellers have shown a clear influence on the f
atty acid pattern of body fat in pigs, followed by milk and finally bo
dy fat of ruminants with an insignificant influence only. Fatty acid p
attern, disposition for oxidation and vitamin E content of the various
fat types influences their induction times. Feeding full fat oilseeds
to ruminants, resulted in an increased induction time, in contrast, w
hen fed to pigs the induction time decreased. Feeding expellers, the i
nduction times of the Various fat samples of both species decreased, d
ue to the expected destruction of vitamin E.