I9I4] 



S. C. Guernsey and John M. Evvard 



371 



in similar experiments, at the Ohio Station/ by Dr. Forbes, who 

 has very kindly shown us some of bis results. Dr. Forbes took into 

 consideration metabolic nitrogen, however, which was not done in 

 this work. 



A remarkäble correlation between digestibility and time required 

 for digestion was found in the series of experiments conducted in 

 1909-10; it was brought to notice by observations on the interval 

 between the ingestion of bone black and its appearance in the 

 feces. This correlation may be seen in Table 2, which shows the 

 average length of time required for charcoal to traverse the digestive 

 tract. 



TABLE 2 



Data pertaining to average time required for charcoal to traverse the digestive 



tract of swine 



Comparison of rate of alimentary movement and digestibility 



Feed 



Method of preparation 



Whole grain, on cob . . 



Whole grain, dry 



Whole grain, soaked . , 

 Ground grain, dry. . . , 

 Ground grain, soaked . 



Light- weights, 19 lo 



Hours 



Digestion 

 coefficients. 

 Dry matter 



Number 

 of observa- 

 tions 



Heavy-weights, 190g 



Hours 



Digestion 

 coefficients. 

 Dry matter 



Number 

 of observa- 

 tions 



70.5 

 54-0 

 48.0 

 57-0 

 40.S 



90.96 

 88.80 

 88.09 

 88.40 

 84.52 



7 

 8 

 8 

 8 

 8 



38 

 48 

 36 

 36 

 SO 



86.29 

 87.04 



84.97 

 86.46 

 88.61 



6 

 6 

 6 

 6 

 6 



More time was required for the food to pass through the ali- 

 mentary canal of the light-weight swine in every case, except the 

 soaked ground grain, than was required for this process by the 

 heavy-weights. The former also digested all the preparations, 

 excepting soaked ground grain, more thoroughly than did the 

 latter. The same kind of correlation exists to some degree for 

 each class of swine. Thus, with the younger swine, the ear corn 

 was most digestible, then dry shelled, dry ground, soaked shelled 

 and soaked ground in the order mentioned. The ear corn remained 

 longest in the digestive tract, then dry ground, dry shelled, soaked 

 shelled, and soaked ground grain, respectively. 



The older swine digested soaked ground maize the most advan- 



1 Ohio Agric. Exp. Station, Bulletin No. 271 ; published since the above was 

 written. 



