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A comparative study of dietary methionine deficiency and excess in chicks



A comparative study of dietary methionine deficiency and excess in chicks



Nutrition Reports International 24(1): 85-94



The effects of dietary methionine deficiency and excess on chick growth, energy and nitrogen utilization, and levels of blood nitrogenous compounds were compared. The methionine-deficient diet was formulated with isolated soybean protein as the protein source, providing 20.7% crude protein and 0.5% sulfur-containing amino acids. The methionine-adequate and -excess diets were made by adding 0.5% and 1.5% L-methionine, respectively, to the methionine-deficient diet at the expense of cornstarch. Single Comb White Leghorn male chicks were fed ad lib or forced-fed the diets for 12 days. The chicks fed the methionine-deficient diet retained less protein and excreted more nitrogen in the form of uric acid than those fed the methionine adequate and excess diets. Consequently, in the methionine deficient chicks, body weight gain was depressed although the feed intake was not reduced. The body weight gain of the chicks fed the methionine-excess diet was depressed when the chicks were given the diet ad lib, but completely recovered when they were forced-fed the same diet at the level consumed by the chicks given the methionine adequate diet. Nitrogen utilization, regardless of the feed intake, was not affected by the feeding of the methionine excess diet. Thus, the major factors responsible for the growth retardation in methionine deficiency and that in methionine excess were different from each other. When the chicks were fed the diets ad lib, methionine, cystine and taurine in the plasma increased, while plasma threonine decreased, linearly with the increase of dietary methionine level.

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Accession: 000804655

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