timothy which had been fed as the sole ration in previous nitrogen and 

 energy balance experiments. 



The schedule of the balance experiments was as follow-: 



Digestion and Utilization Experiment 1952-53 



Because of questions raised b\ the preliminary report of the digestion 

 work carried out in 1951 with heifers, the experiment was repeated on an 

 expanded basis using four mature Guernsey cows, one of which was in 

 lactation. Very coarse-textured and pelleted feeds were included in this ex- 

 periment in addition to coarse and fine-textured feeds. These four concentrate 

 mixtures, the formulae of which are given in Table 1, represented the prin- 

 cipal types of texture found in dairy feeds sold in the New England area 

 and were formulated by representatives of two of the larger feed manufac- 

 turers of this area. 



Table 1. Formulae of Concentrate Mixtures 



All four mixtures were made from the same original lots of ingredients 

 according to the same basic formula. For this reason they had practically 

 the same chemical composition. Enough of the concentrates were mixed at 

 one time to carry through the whole experiment which lasted about four 

 months. Mow-cured hay was fed as the roughage part of the ration. Each 

 animal received 12 lbs. of concentrates and 8 lbs. of hay daily. 



