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Protein kinetics in callipyge lambs.

C L Lorenzen¹, M Koohmaraie, S D Shackelford

¹Department of Animal Science, Texas A&M University, College Station 77843, USA.

Journal of Animal Science

|February 22, 2000

Summary

The callipyge gene enhances lamb muscle growth by reducing protein degradation, not increasing synthesis. Organ growth is reduced in callipyge lambs by 11 weeks.

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Area of Science:

Animal Science
Biochemistry
Genetics

Background:

The callipyge phenotype is a genetic trait affecting muscle growth in lambs.
Understanding protein kinetics is crucial for elucidating growth mechanisms.

Purpose of the Study:

To investigate the impact of the callipyge phenotype on protein kinetics in lamb skeletal muscle and organs.
To determine whether enhanced muscle growth in callipyge lambs is due to increased protein synthesis or decreased degradation.

Main Methods:

Comparative study of callipyge and normal lambs at 5, 8, and 11 weeks of age.
Measurement of total protein, DNA, RNA, and calpastatin activity in multiple tissues.
In vivo measurement of fractional protein synthesis rates using [2H5]phenylalanine infusion at 8 weeks.

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Main Results:

Callipyge lambs showed higher muscle weights, protein mass, and calpastatin activity from 5 to 11 weeks.
At 8 weeks, fractional protein synthesis and degradation rates were lower in callipyge lambs.
Organ growth was reduced in callipyge lambs by 11 weeks.

Conclusions:

Enhanced muscle growth in callipyge lambs is primarily maintained by reduced protein degradation.
The initial onset of the callipyge phenotype might involve an increase in fractional protein synthesis rates.