[The dependence of vitamin A and E concentrations in blood plasma on nutrition and age of growing pigs].
Four experiments (duration 21 to 137 days) were conducted where 112 pigs were divided into ten groups and fed dry mixtures with different content of nitrogenous substances, vitamin A and E. The repeated determination of the content of these vitamins in blood plasma and in liver proved the dependence of the circulating vitamin A first of all on its present alimentary intake; in the case of vitamin E its content is related to the animal age. As sufficient intake of the complete COS mixtures (2.4 mg of retinol . kg-1), in the weaned 4-week piglets the concentration of vitamin A in blood plasma was increasing up to the maximum values. After transition to the complete mixture A 1 (0.6 mg of retinol .kg-1), and particularly after the following switching to SOL mixture (0 retinol content) the concentration of vitamin A decreased significantly (as a rule temporarily) up to the value of 0.6 mumol .1(-1), with sufficient reserve in liver. Lower values were determined only at the absence of vitamin A in A 1 mixture; its content in liver (over the period of 117 days) decreased to the 14% of the state observed when feeding the complete mixture. Animal protein reduction in A 1 mixture led to the decrease in A vitamin level both in plasma and in liver. During one to six weeks after weaning of piglets the concentration of plasma vitamin E decreased approximately by two thirds, and, as a rule, only during the fourth month reached the value of 2.5 mumol .1(-1). The positive effect of the SOL mixture was observed. The increase in the vitamin E supplement in COS 2 mixture by 15 mg to the declared 30 mg reduced the decrease of tocopherolemia after weaning but did not prevent it. One-day starving before slaughter significantly decreased the vitamin A and slightly the vitamin E concentrations in plasma. The results are evaluated with respect to diagnostic applicability to blood plasma examination and with respect to the amount of vitamin supplements added to feed mixtures.
D000375:Aging; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet; D013552:Swine / Q000097:blood*; D014801:Vitamin A / Q000097:blood*; D014810:Vitamin E / Q000097:blood*
D014801:Vitamin A; D014810:Vitamin E
Závislost koncentrace vitamínu A a E v krevní plazmé rostoucích prasat na výzivĕ a na vĕku.