8 4 STORRS AGRICULTURAL EXPERIMENT STATION. 



breeds of the different cows are indicated by the abbreviations 

 given in the second column, as follows: J^Jersey; H=Hol- 

 stein; A= Ayrshire; S=Swiss. The letter G before the des- 

 ignation for the breed signifies that the cow was a grade. 



In the second table is given the average daily ration per cow 

 as calculated for the whole herd in the first test and for the 

 separate groups in the second test. It shows the weights and 

 amounts of digestible nutrients in the coarse and the concen- 

 trated feeds used in the ration, the fuel value, the nutritive 

 ratio, the total cost, and the net cost after deducting the esti- 

 mated value of the manure. Above the second table for each 

 herd are given the kinds and amounts of feeding stuffs used 

 daily for the herd in the first and second tests. 



The rations for the different groups were estimated on the 

 basis of digestible rather than total nutrients. The digestible 

 nutrients in the different materials fed were calculated from the 

 total nutrients shown by analysis by use of factors (coefficients 

 of digestibility). The proportions of nutrients in the materials 

 used as determined by actual analysis are given in the tables 

 in the article on analyses of fodders and feeding stuffs in an- 

 other part of this Report. The coefficients of digestibility em- 

 ployed in the calculations of digestible nutrients are given in 

 the table below; the factors for the different feeding stuffs in- 

 cluded in this table are based upon the results of actual diges- 

 tion experiments with those materials or are assumed from the 

 results of experiments with similar materials; the factors for 

 the various mixtures were calculated from those for the differ- 

 ent ingredients of the mixtures and the proportions in which 

 they are used. 



The fuel values of the rations were computed by multiplying 

 the number of pounds of protein and carbohydrates by i860 

 and of fat by 4220 and taking the sum of the products as rep- 

 resenting the number of calories of available energy in the 

 ration.* 



* Inasmuch as satisfactory factors for the coniputatioti of the fuel values of feeding 

 stuffs for animals have not been established, factors used in calculating the fuel val- 

 ues of the foods of man are frequently employed, although it is understood that the 

 results thus obtained may be far from the truth. The factors here given are the older 

 ones which have been commonly used. Factors slightly smaller than these, based 

 upon more recent and more complete data, have been lately proposed by this Station 

 (Report iSq9, p. 104). The older factors have been used again in this instance, how- 

 ever, in order that the figures given in the tables herewith may be directly compara- 

 ble with those in preceding reports. 



