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The Utilization of the Sulfur Amino Acids by the Chick

One Figure

Division of Poultry Husbandry, University of California, College of Agriculture, Berkeley

With the use of a diet deficient in methionine, cystine and choline, the relationships between the sulfur-bearing amino acids and choline in the chick have been further investigated. The following conclusions have been drawn:

1. The choline-depleted chick cannot appreciably utilize homocystine in place of methionine.

2. Homocystine can be utilized in lieu of cystine by choline-depleted chicks.

3. dl-Methionine is equivalent to l-methionine for growth, whether or not choline is present in the diet.

4. S-Methylcysteine can neither assist in the utilization of homocystine nor replace cystine in the diet of the chick.