Muscle protein degradation assessed by Nt-methylhistidine excretion in mature White Leghorn, dwarf broiler and normal broiler males maintained on either low- or high-protein die

Paul M Hocking, CL Saunderson

Research output: Contribution to journalArticlepeer-review

Abstract

Protein degradation rates were assessed by the excretion of Nt-methylhistidine (NtMH) in four strains of mature chickens, two White Leghorns and two broilers (dwarf and normal), fed on diets containing two levels of dietary protein. Over 0.9 of labelled NtMH was recovered within 7 d of injection from three White Leghorn, three dwarf and three normal broiler males. Protein degradation, measured by NtMH output, was related to adult body-weight by the power 0.71 and strain intercepts were significantly different. Strain differences disappeared when the rate of output of NtMH per unit lean was evaluated. The rate of output of NtMH per unit muscle was higher in birds fed on a low-protein diet of 100 g crude protein (nitrogen x 6.25; CP)/kg compared with males fed on 150 g CP/kg. It was concluded that the lower rate of protein degradation in broiler compared with layer strains at young ages is related to increased adult body-weight in agreement with well-established biological principles.
Original languageEnglish
Pages (from-to)391-9
Number of pages9
JournalBritish Journal of Nutrition
Volume67
Issue number3
Publication statusPublished - May 1992

Keywords

  • Animals
  • Body Weight
  • Chickens/metabolism
  • Dietary Proteins/administration & dosage
  • Dietary Proteins/metabolism
  • Male
  • Methylhistidines/urine
  • Muscle Proteins/metabolism
  • Time Factors

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