Table 2. Chemical Composition of Feeds 



Each animal was given free choice of trace minerahzed salt. They were 

 watered and fed twice daily. The rate of feeding was adjusted to the 

 amount that each animal would clean up. The general plan of the ex- 

 periment is given in Table 3. 



Table 3. General Plan of Experiment 



Animal 

 Number 



Period 1 



Period 2 



Period 3 



Period 4 



Guernsey 4 Hay, 20% grain. Hay, 14% grain Hay, citrus pulp Hay 



citrus pulp 



Guernsey 5 Hay Hay, 20% grain. Hay, 14%. grain Hay, citrus 



citrus pulp pulp 



Holstein35 Hay, 147o grain Hav, citrus pulp Hay Hay, 20%) grain, 



citrus pulp 



Holstein 36 Hay, citrus pulp Hay Hay, 20% grain. Hay, 14%) grain 



citrus pulp 



The methods generally used in the laboratory were followed. These 

 consist of a 10-14 day preliminary period during which the animal becomes 

 adjusted to the kind and amount of feed to be evaluated. This is followed 

 by a 14-day collection period during which the feed eaten and the urine 

 and feces voided are carefully weighed, sampled, and analyzed. At the 

 end of each collection period each animal is placed in the respiration 

 chamber for two consecutive 12-hour periods during which heat and 

 methane production are measured. From such studies results on both 

 digestibility and utilization are obtained. 



Results and Discussion 



The average digestion coefficients for the various rations are given in 

 Table 4. The "digestibility of the energy" of the ration which contained 

 citrus pulp and grain was not significantly dififerent from that which con- 

 tained the 14 percent protein grain. The difference in digestibility of pro- 

 tein, however, was significant at the 5 percent level. The difference be- 

 tween the digestibility of the energy of the citrus pulp-hay ration and 

 that of the 14 percent grain-hay ration was significant at better than the 

 5 percent level and the difference between that of the citrus pulp-hay 

 ration and the citrus-grain-hay ration was significant at the 1 percent 

 level. The differences between the digestibility of the protein of the citrus 



