Skip to main content

Ruminant Nitrogen Usage (1985) / Chapter Skim
Currently Skimming:

8 Nitrogen and Absorption in the Large Intestine
Pages 53-56

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 53...
... From 14 to 37 percent of the total urea turnover in sheep has been attributed to urea hydrolysis in the cecum and large intestine (Hecker, 1971; Hogan, 1973; Nolan et al., 1976~. Together with degradation of N compounds from undigested feed, bacterial and endogenous sources, hyclrolysis of urea that diffuses into the large intestine from the blood stream helps maintain ammonia-N concentrations in the cecum and large intestine between 6 and 27 mM in sheep, although levels below 4 mM have been reported with ruminant animals fed diets containing higher amounts of grain (Williams, i965; Hecker, 1971; Kern et al., 1974~.
Read the entire page →
From page 54...
... However, similar results could occur when microbial digestion in the cecum yields ammonia and volatile fatty acids to be absorbed and used by tissues for synthesis of nonessential amino acids. The low concentrations of free amino acids in the cecum and large intestine might be interpreted to suggest that sufficient quantities of amino acids are not available in the free form for absorption.
Read the entire page →
From page 55...
... For nonruminant animals F:PN has been attributed primarily to erosion of the intestinal lining since increased dietary fiber increases F"PN (Mukherjee and Kehar, 1949) and feeding of a purified completely digested diet reduces fecal output, and thereby FPN to zero.
Read the entire page →
From page 56...
... , is necessary to displace the concept of protein digestibility and generate requirement values in the newer systems of protein metabolism of ruminant animals. Fecal N consists of 45 to 65 percent amino nitrogen, 5 percent nucleic acid nitrogen, and 3 percent ammonia nitrogen (Coelho da Silva, 1972a; Van't Klooster and Boekholt, 1972; Hogan, 1973~.
Read the entire page →

Key Terms

  • true digestibility
  • digestive tract
  • dry matter
  • cell walls
  • matter intake

  • protein metabolism
  • fecal output
  • fecal nitrogen
  • biological value
  • protein digestibility

  • organic matter
  • fatty acids
  • ruminant animals
  • plus endogenous
  • nucleic acid

  • bacterial cell
  • free amino
  • acid nitrogen
  • acid absorption
  • cecum plus

  • amino acid
  • apparent digestibility
  • bcp synthesized
  • percent ammonia
  • dietary fiber

  • feed protein
  • percent nucleic
  • endogenous debris
  • kilogram dry
  • nonessential amino


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
    More information on Chapter Skim is available.