Einfluß der Verfütterung von Ölsaaten und Nebenprodukten aus Ölsaaten auf die Vitamin E-Konzentration in Tierprodukten

Influence of feeding of oilseeds and byproducts from oilseeds on vitamin E concentration of animal products . In 5 feeding studies dairy cows, beef cattle and pigs were fed diets with different contents of oil seeds or oil seed expellers. Thus, the effects on vitamin E concentration in animal products were analyzed against a reference diet, which was free from these components. Dairy cows received 1 kg full fat rapeseed (430 g fat; 31 mg α-tocopherol/kg DM). Beef cattle were fed rations with 7,14 and 21% rapeseed and pigs were administered concentrates containing 10% rapeseed, 20% full fat soybeans or 5 and 10% false flax expeller. Feeding full fat oilseeds or their expellers resulted in an increased fat and α-tocopherol intake. Incorporating full fat rapeseed into the diets induced a significant increase of vitamin E-concentration in milk and other body samples. In contrary to this increase expeller feeding caused a decreased vitamin E-concentration in animal products. The fatty acids pattern of the oilseeds and the expellers have shown a clear influence on the fatty acid pattern of body fat in pigs, followed by milk and finally body fat of ruminants with an insignificant influence only. Fatty acid pattern, 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, when fed to pigs the induction time decreased. Feeding expellers, the induction times of the various fat samples of both species decreased, due to the expected destruction of vitamin E.