鶏の消化に関する基礎的研究Ⅳ : 消化に及ぼす砂礫の影響について

　人工肛門を設着した白色レグホン種成雄3羽について， X線観察lこより，筋胃内に全く砂礫を容しないことを確認した上で，粉餌および粒・粉餌混合飼料を給与し，消化試験を行なうとともに砂礫を自由に摂食せしめた後同様に消化試験を行ない，砂礫給与前後の消化率を比較検討し，砂礫が消化に及ぼす影響を調べた.
　その結果は次の通りである.
1)粒・粉餌混合飼料の消化本は各成分ともに砂礫給与により向上し，特に組繊維の消化率は著しく高率となった.
2)粉餌では砂礫給与により，粗繊維の消化は向上し，他の成分についても消化率は全般的に増加する傾向が認められた.
3)砂礫が消化lこ及ぼす影響は粉餌および粒・粉餌混介飼料ともに粗繊維が最も大きいことが確認された.

Experiments on the effects of grit feeding upon the digestibility were performed on three adult male White Leghorn adapted with artificial ani. They were fed on two types of diet: all-mash and mashgrain rations. The hens had not been allowed access to grit for about 6 months before the experiments, it was ascertained by means of X rays, that the gizzard contained no grit at all.
1) When mash-grain rations were given after feeding grit, the improvement of the digestibility of all constituents was evident.
2) when all-mash rations were given, the effect of feeding grit was, in general, slight.
3) The influence of grit on the digestion trials of all constituents showed most noticeably in crude fiber.