420 



Journal of Agricultural Research 



Vol. IV, No. s 



sentative of actual conditions than calculations involving only the use of 

 the average coefficients. 



Table X. — Comparison of esthnated and actual coefficients of digestion for dairy cattle 



HAY GROUP 



Coefficient of digestioa. 



No6. of 

 cows. 



Dry 

 matter. 



Crude 

 protein. 



Crude 

 fiber. 



Nitro- 

 gen-free 

 extract. 



Ether 

 extract. 



Estimated 



Actual 



Factor of difference . 



Per cent. 



64. 56 



62.4s 



•97 



Per cent. 



68. 20 



70.47 



i.oj 



Per cent. 



48. 19 



66.18 



1-37 



Per cent. 

 68.46 

 63.84 



Per cent. 



78.46 



74.21 



•9S 



MEDfUM PRICKLY-PEAR GROUP 



Estimated 



Actual 



Factor of difference . 



I, II, 12 

 I, II, 12 



64.84 



62.32 



.96 



70. 91 



69.42 



•98 



46.99 



62.32 



1-33 



70.64 



67. 17 



•95 



77.82 



72.93 



•94 



HEAVY PRICKLY-PBAR GROUP 



Estimated 



Actual 



Factor of difference . 



76.68 



68.67 



.90 



INFLUENCE OF PRICKLY-PEAR ON DIGESTIBILITY OP OTHER FEEDS 



It has been claimed that prickly-pear is more valuable than its 

 analysis indicates, for the reason that it increases the digestibility of any 

 material with which it may be fed. To determine the accuracy of this 

 statement Table XI was prepared by applying average coefficients of 

 digestion to the nutrients fed in the digestion trials as determined from 

 the weight and analyses of the feeds. These were then compared with the 

 actual coefficients. 



Table XI. — Comparison of estimated and actual coefficients of digestion for dairy cows 



COMPARISON OF HAY, GRAB^, AND MEDIUM RATIONS OF PRICKLY-PEAR 



