474 MANUAL OB" CATTLE-FEEBING. 



3. For tlie concentrated fodders, the average digestion 

 co-efficients are emplo} ed in most cabes. 



4. The digestible carbhydrates of the coarse fodders are 

 considered to be equal to the total nitrogen-free extract. 



5. The digestibility of the protein of the coarse fodder 

 is estimated from the composition of the latter, it being 

 the greater the less crude fibre and the more protein the 

 feeding-stuff contains. 



6. By multiplying the percentage of each ingredient of 

 the fodders by its digestion coefficient, the percentage of 

 digestible niattlsrs in each f^eding-Stnff is obtained, the 

 digestible nitrogen-free e>ctract and digestible crude fibre 

 being added together as carbhydrates. 



7. Fi'om the data thus obtained we calculate, first, the 

 quantities of digestible protein, carbhydrates, and fat in 

 the amounts of fodder available, and second, what addi- 

 tion of bye- fodder must be made to them to bring the 

 ration up to the feeding standard. 



8. If the dry matter of the tubers or roots entering into 

 the ration does not exceed one-eighth that of the dry 

 matter of the remaining fodder no deduction is made from 

 the above figiu^es. If, however, the dry matter of the 

 roots or tubers e^tceeds this proportion, a dedciction must 

 be made from the Amount of digestible protein of the 

 ration as calculated, in the proportions indicated on pa.ge 

 285. 



These corrections may be considered sufficient when the 

 coarse fodder consists chiefly of hay, and ample when the 

 addition consists chiefly of roots and not of potatoes. On 

 the contrary they are hardly sufficient when the ration 

 contains much straw and potatoes. The depression of the 

 digestibility, however, is decidedly diminished when tlio 

 nutritive ratio of the whole ration^ and especially that of 



