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Effect of Dietary Protein Level on Plasma and Tissue Free Amino Acid Concentrations in Nursing Lambs^{1, 2,}

Michigan State University, East Lansing, 48824 and The Ohio Agricultural Research and Development Center, Wooster 44691

Abstract

Nursing lambs bottle fed a 12% protein milk replacer lost weight, consumed less (P < .005) feed and had markedly lower plasma and tissue (muscle and liver) amino acid concentrations than the lambs receiving the 24 or 35% protein milk replacers. Feed intakes and weight gains were similar for lambs fed 24 or 35% protein milk replacers. As dietary protein intake increased, the concentration of essential amino acids rose in plasma and tissue pools, while nonessential amino acids stayed constant. The lambs fed the 12 and 35% protein milk replacer had higher (P < .01) plasma urea than the 24% protein group. In all lambs, plasma amino acid levels were higher 2 hr after than before feeding. Dietary protein intake did not affect plasma glucose levels.

¹ Michigan Agricultural Experiment Station Journal Article No. 6907.

² The authors express appreciation for the assistance by Dr. W. T. Magee (Michigan State) in the statistical analysis of the data, and Mr. R. P. Kiauss (OARDC) in caring for the lambs.

³ Ruminant Nutrition Laboratory, Department of Animal Husbandry, Michigan State University.

⁴ Department of Animal Science, OARDC. Present address Eli Lilly and Co., Greenfield, Indiana 46140.