Furuya S, Kaji Y
Department of Animal Production, Kyushu National Agricultural Experiment Station, Kumamoto, Japan.
Br J Nutr. 1992 Sep;68(2):463-72. doi: 10.1079/bjn19920104.
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.
在实验1中，研究了采食量水平（0.8、1.2和1.6千克/天）以及猪体重（49和92千克）的影响；在实验2中，研究了日粮中性洗涤纤维（NDF；30、60、90、120和150克/千克）对氨基酸（AA）和氮的回肠内源流量的影响。实验采用无蛋白日粮，其中用纯化的木质纤维素替代玉米淀粉。在实验1中，使用了一种含90克NDF/千克的无蛋白日粮。给母猪在回肠末端安装了一个简单的“T”形套管。在实验1中，除脯氨酸外，以克/千克干物质（DM）摄入量表示的回肠内源AA和N流量随DM摄入量的增加而显著降低（P<0.05）。相比之下，以克/天表示的值保持不变。初始体重45和90千克之间的回肠内源流量没有显著差异（P>0.05），但组氨酸、异亮氨酸、苯丙氨酸、苏氨酸、缬氨酸和丝氨酸除外，在较高体重时测定的回肠流量显著更高（P<0.05）。在实验2中，日粮纤维素水平对回肠内源AA和N流量的影响不显著（P>0.05），尽管大多数AA和N的值倾向于随着日粮纤维素水平的增加而增加。得出的结论是，在不同的DM摄入量和纤维素水平下，AA和N的每日回肠内源流量相对相似。因此，应使用以每日量为基础表示的回肠内源流量值，而非以DM摄入量为基础表示的值，将AA和N的表观回肠消化率校正为真实回肠消化率。
