Influence of Age and Dietary Protein on Certain Free Amino Acids in Chick Blood Plasma

Experiments were conducted to investigate plasma free amino acid concentrations in the chick. After one hour of fasting, total plasma amino acid concentration decreased to approximately half of the full-fed value. Within three to six hours, most amino acids had returned toward the full-fed level but did not exceed it throughout a 48 hour period of starvation. However, after 48 hours fasting lysine, threonine, and isoleucine accumulated three-fold, two-fold and two-fold of the full-fed level, respectively. Serine and glutamic acid exceeded the full-fed level at three hours and then declined. Alanine reached its highest level after six hours of fasting and then declined. In full-fed chicks diurnal variations of plasma free amino acid concentrations were observed. The lowest and highest concentrations were observed at 11 a.m. and 8 to 11 p.m., respectively under a 24 hr-lighting. Reference plasma amino acid patterns are reported for chicks fed a practical diet ad libitum. In day-old chicks, concentrations of total amino acids, methionine plus one half cystine, lysine, and arginine were high. Alanine and glutamic acid concentrations were low. Most amino acid concentrations declined gradually during the first four weeks of life, but methionine plus one half cystine, phenylalaine, threonine and serine concentrations decreased sharply between two and four weeks. Lysine concentration continued to decrease in chicks fed the starter diet. At 20 weeks, plasma amino acid concentrations had decreased considerably except for methionine plus one half cystine and basic amino acids. The plasma amino acid pattern for chicks fed an isolated soybean protein diet was similar to that of chicks fed the practical diet.

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“…Also the plasma free lysine concentration decreases with the age of the chick (Askelson and Balloun, 1963).…”

Section: Introductionmentioning

confidence: 97%

Conditions Affecting Plasma Amino Acid Patterns in Chickens Fed Practical and Purified Diets

1976

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Veränderungen des Rohnährstoff-, Aminosäure- und Mineralstoffgehaltes beim Huhn während der Entwicklung vom Eintagsküken zur Junghenne

Gruhn

Anke

1965

Archiv für Tierernaehrung

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Serum Protein and Amino Acid Levels of Escherichia coli-Infected Chicks on High and Low Levels of Dietary Protein

Cole

Boyd

1965

Poultry Science

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Influence of Age and Dietary Protein on Certain Free Amino Acids in Chick Blood Plasma

Cited by 4 publications

References 15 publications

Conditions Affecting Plasma Amino Acid Patterns in Chickens Fed Practical and Purified Diets

Conditions Affecting Plasma Amino Acid Patterns in Chickens Fed Practical and Purified Diets

Veränderungen des Rohnährstoff-, Aminosäure- und Mineralstoffgehaltes beim Huhn während der Entwicklung vom Eintagsküken zur Junghenne

Serum Protein and Amino Acid Levels of Escherichia coli-Infected Chicks on High and Low Levels of Dietary Protein

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