The effect of chronic ingestion of a low level of dieldrin (1 mg./kg. body weight) was studied on Mallards fed a diet either adequate or deficient in vitamin A. No gross symptoms of dieldrin toxicity were observed after twelve weeks on experimental diets. After five weeks marked foot pad keratinzation occurred in pesticide-fed ducks. Vitamin A deficient birds had significantly reduced liver weight when compared to the other treatment ducks. There was no effect of feeding pesticide on vitamin A content of the liver, but biotin per gram of liver was significantly (P <0.05) lower in the pesticide-fed ducks than in the nonpesticidefed birds.Liver fatty acid composition was altered either by pesticide ingestion or vitamin A deficiency. There were significant (P<0.05) accumulations of stearic and palmitic acids with a comparable reduction of their monoenoic derivatives in the dieldrin-fed ducks when vitamin A was adequate in the diet. There were higher levels of long chain polyunsaturated fatty acids (18:2, 18:3 and 20:4) in the dieldrin-fed birds when vitamin A was deficient.Ingestion of dieldrin at this level had a marked depressant effect on liver biotin content and altered fatty acid composition possibly by interference in enzyme systems involved in lipid metabolism. ABSTRACTFree plasma amino acid levels were studied in five pure strains of White Leghorns. Two blood samples were drawn from the birds at 275 and 500 days of age respectively. The preliminary results, on the purebred array only, show that lines A and E have, in general, the highest level, while line C has the lowest level. Five of the twenty-one amino acids investigated show significant line differences: threonine, serine, proline, valine and isoleucine. Estimates of heritability of these amino acids are also reported. These line differences offer a strong indication that heredity plays an important role in the control of free plasma amino acid levels on fasted chickens.
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