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Ruminant Nitrogen Usage (1985) / Chapter Skim
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7 Digestion and Absorption in the Small Intestine
Pages 46-52

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From page 46...
... as essential amino acids, 0.35; nonessential 46 amino acids, 0.30; amides, 0.04; nucleic acids, 0.11; ammonia, 0.06; and unknown, 0.14. Increases in the ratio of essential amino acids to nonessential amino acids in duodenal digesta as a function of the concentration of intake protein (IPDM)
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From page 47...
... Samples from cannulae inserted into the duodenum prior to the entry of bile and pancreatic secretions only includes endogenous N from gastric secretions, whereas samples from cannulae inserted posterior to the entry of bile and pancreatic secretions also contain N from pancreatic secretions. Apparent absorption of NAN and amino acids from the small intestine of lactating cattle, nonIactating cattle and sheep fed a variety of diets is listed in Appendix Tables 11, 12, and 13.
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From page 48...
... As shown in Table 13, estimates for the two data sets were not in agreement (Zinn and Owens, 1982, 0.01; Sharma et al., 1974, 0.24~. EXTENT OF TRUE ABSORPTION NAN and Amino Acidsfrom the Stomach Regression analysis used to estimate endogenous losses from the small intestine also provided estimates of true absorption (Table 13~.
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From page 49...
... C~ S: 3 ~ =0 =~ =5 11 == & c,,o 11 ~ S: "S: X E ~ ~ ct a4 i,6 11 o ~:5 ;~~ &sO~ ~ 11 0 ~ U: ~ (~ X ~ ~ ~ ~ ~= ~ 6 _0 ~ ~ C: O ._ V: O ~ U3'c~ O ·_ Ct, -0 ~o O s Q ~ ~ ~ O C~ Z Z C~ o ~ ~ .
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From page 50...
... Sheep Lactating cattle Nonlactating cattle Rat Rat Sheep Sheep Sheep Nonlactating cattle Regression Regression 15N Regression Regression Regression Regression Regression Regression Isolated bacteria Isolated protozoa 35S-bacteria 35S-bacteria i5N-bacteria Regression Sheep Regression Sheep t5N Leaf protein Sheep t4C Chloroplast protein Nonlactating cattle Regression Sheep Sheep Regression Regression Table 12 Hogan and Weston (1970) Nolan (1975)
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From page 51...
... These data imply that escape amino acid N from corn gluten meal is less digestible, whereas escape amino acid N from field beans is more digestible than microbial amino acid N Level of feed intake could affect absorption of N from the small intestine by influencing passage rate of digesta or by adjusting proportionate amounts of microbial and undegraded feed N
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From page 52...
... in this chapter and by other investigators, the following values are suggested: apparent absorption of NAN, 0.65; true absorption of NAN, 0.75; apparent absorption of amino acids, 0.70; and true absorption of amino acids, 0.80.
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Key Terms

  • true absorption
  • apparent absorption
  • amino acid
  • nonlactating cattle
  • essential amino

  • endogenous loss
  • lactating cattle
  • regression analysis
  • sheep sheep
  • nonessential amino

  • escape amino
  • endogenous losses
  • cattle nonlactating
  • data summarized
  • regression regression

  • microbial amino
  • total essential
  • dietary protein
  • sheep lactating
  • cattle sheep

  • nucleic acids
  • gastrointestinal tract
  • acid composition
  • acid nitrogen
  • gluten meal

  • absorption mechanisms
  • sheep regression
  • acid absorption
  • regression sheep
  • true digestibility


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