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.