The Free Blood Plasma Amino Acids of Swine as Related to the Source of Dietary Proteins

Threonine Requirement for Reproduction in Swine

“…Feeding gestation rations of 150, 250 and 341 grams of protein per day, Hawton and Meade (1971) observed that the second litter of sows receiving the highest protein level had significantly higher birth (P < .01) and weaning weights (P < .05). Mahan and Grifo (1975) Puchal et al (1962). Mitchell et al (1968) noted that feeding graded levels of the limiting amino acid did not significantly increase its plasma concentration until the amino acid's requirement had been fulfilled.…”

Diet and Feeding Interval Effects on Serum Amino Acid Concentrations of Growing Swine

“…In several instances (Longenecher and Hause 1959;Mclaughlin et al 1963) fasting SAA patterns have been used as standards, whereas other workers (Dean and Scott 1966;Puchal et al 1962;Smith and Scott 1965) have attempted to utilize as baselines the SAA levels of subjects fed reference diets. Changes in SAA levels due to fasting (Smith 1966) may mask amino acid imbalances or deficiencies in the diet, leading to erroneous conclusions of dietary protein adequacy.…”

Relationship of blood plasma free amino acids and ingested protein in swine

“…Puchal et al (1962) reported that the amino acid composition of the protein reflects the amino acid concentration in the plasma. From the plasma data?…”