478 



EXPERIMENT STATION RECORD 



The results are compared with those obtained at the Maryland Sta- 

 tion (E. S. B., 9, p. 76; 10, p. 75). 



Calculation of the value of rations (pp. 701-712). — Experiments were 

 made with 4 sheep to compare the digestibility of mixtures of unlike 

 materials furnishing practically like amounts of nutrients, and to com- 

 pare the digestibility of the same rations when fed in large and small 

 amounts. There were 2 periods of o days each. The rations were as 

 follows : 



Constituents and amounts of ration*. 



The coefficients of digestibility are given in the following table: 



Coefficients of digestibility of mixed rations by sheep. 



Period 



Full ration No. 1: 



Sheep 1 



Sheep 2 



Average 



Half ration No. 2: 



Sheep 3 



Sheep 4 



Average 



Full ration No. 2 : 



Sheep 1 



Sheep 2 



Average 



Half ration No. 1 : 



Sheep 3 



Sheep 4 



Nitrogen- 

 free ex- 

 tract. 



Crude 

 fiber. 



Ash. 



Per cent. Per cent. Per cent. 



75. 7 59. 13. 1 



75.2 58.9 i 13.8 



75. 4 59. 13. 4 



64.8 

 59.9 

 62.3 



59. 

 61.1 

 60.0 



70.3 

 64.2 

 67.2 



9.7 



4.1 

 7.9 



40.6 

 20.8 

 30.7 



Since the results show that the half rations had higher coefficients 

 of digestibility than the whole rations, the conclusion is drawn that 

 when consumed in small amounts feeding stuffs are more digestible 

 than when consumed in large amounts. 



Using the coefficients of digestibility obtained above, the authors cal- 

 culated the amounts of digestible nutrients in 2 mixed rations like 

 those fed, except larger, and compared the results with those calculated 

 from average tables of comix isitiou and digestibility, as follows: 



