The effects of feed intake and purified cellulose on the endogenous ileal amino acid flow in growing pigs.
The effects of level of feed intake (0.8, 1.2 and 1.6 kg/d) and body-weight of the pig (49 and 92 kg) in Expt 1, and dietary neutral-detergent fibre (NDF; 30, 60, 90, 120 and 150 g/kg) in Expt 2 on the endogenous ileal flow of amino acids (AA) and nitrogen were studied with protein-free diets into which purified wood cellulose was incorporated at the expense of maize starch. In Expt 1, one of the protein-free diets containing 90 g NDF/kg was used. Female pigs were fitted with a simple 'T' cannula at the terminal ileum. In Expt 1, the endogenous ileal AA and N flow, expressed as g/kg dry matter (DM) intake, decreased significantly (P < 0.05) with increasing DM intake, except for proline. By contrast, the values expressed as g/d remained constant. There was no significant difference in endogenous ileal flow (P > 0.05) between initial body-weights of 45 and 90 kg except for histidine, isoleucine, phenylalanine, threonine, valine and serine, in which the ileal flow determined at the higher body-weight was significantly higher (P < 0.05). In Expt 2, the effects of dietary cellulose levels on the endogenous ileal flow of AA and N were not significant (P > 0.05), although the values tended to increase as dietary cellulose levels increased for most AA and for N. It is concluded that the daily endogenous ileal flow of AA and N remains relatively similar at different DM intake and cellulose levels. Therefore, correction of apparent ileal digestibility of AA and N to the true ileal digestibility should be made with the endogenous ileal flow values expressed on a daily amount basis, not the values expressed on a DM intake basis.
Furuya
S
S
Department of Animal Production, Kyushu National Agricultural Experiment Station, Kumamoto, Japan.
Kaji
Y
Y
D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D001835:Body Weight / Q000502:physiology; D002482:Cellulose / Q000008:administration & dosage / Q000378:metabolism*; D004032:Diet; D005260:Female; D007082:Ileum / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D013552:Swine / Q000254:growth & development / Q000378:metabolism*
D000596:Amino Acids; D002482:Cellulose; D009584:Nitrogen