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Related Experiment Videos

Leucine degradation in sheep.

W G Bergen1, J R Busboom, R A Merkel

  • 1Department of Animal Science, Michigan State University, East Lansing 48824.

The British Journal of Nutrition
|March 1, 1988
PubMed
Summary
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Leucine catabolism in sheep tissues changes with age, with adipose tissue showing unique high deamination activity later in life. Dietary protein affects leucine decarboxylation, but not deamination, in most tissues studied.

Area of Science:

  • Animal Science
  • Biochemistry
  • Nutritional Physiology

Background:

  • Leucine is a key branched-chain amino acid crucial for protein synthesis and energy metabolism.
  • Understanding leucine catabolism in different tissues is vital for optimizing animal nutrition and growth.
  • Tissue-specific differences in leucine metabolism can impact overall nutrient utilization.

Purpose of the Study:

  • To investigate the in vitro catabolism of leucine in key sheep tissues: adipose tissue, skeletal muscle, kidney, and liver.
  • To determine how age and dietary protein levels influence leucine deamination and decarboxylation rates in these tissues.

Main Methods:

  • Leucine catabolism was measured in tissue homogenates from sheep of varying ages (1 to 365 days).
  • Experiments included different dietary crude protein levels (80, 120, 180 g/kg) and fasting periods (48, 96 hours).

Related Experiment Videos

  • Assays focused on leucine deamination and decarboxylation rates per unit of protein.

    • Main Results:

    • Leucine deamination per unit protein was highest in skeletal muscle at birth, declining with age, while kidney activity increased.
    • Adipose tissue exhibited significantly higher in vitro leucine deamination at all ages, especially at 365 days.
    • Leucine decarboxylation was highest in muscle initially, declining rapidly, with kidney showing the highest overall activity; adipose tissue activity decreased significantly after 28 days.
    • Dietary protein did not affect leucine deamination but tended to increase decarboxylation in all tissues except the kidney.

    Conclusions:

    • Leucine catabolic pathways in sheep tissues exhibit distinct age-dependent patterns.
    • Adipose tissue plays a significant role in leucine deamination, particularly in older animals.
    • Dietary protein manipulation influences leucine decarboxylation, suggesting tissue-specific metabolic adaptations.