FOODS ANIMAL PRODUCTION. 



1015 



April 21, the excreta being analyzed during the last 7 days. The 

 results, together with those obtained at the North Carolina Station 

 with 2 mixtures of cotton seed meal and hulls, are given, as ^jllows: 



Digestihility of cotton-seed feed. 



Upon the basis of the above data the digestible food ingredients in 

 100 lbs. of material, and the cost of the digestible materials (reduced to 

 starch equivalent] in a number of common feeding stuffs, are compu ed. 



"Both as ref^ards bulk, cliemical composition, and proportion of digestible matter 

 the cotton-seed feed corresponds more nearly to a coarse fodder than to a grain feed. 

 The results of our digestion experiments show it to contain rather less total digesti- 

 ble matter than either clover or timothy hay and a little more than good corn fodder. 

 It has, however, a somewhat larger proportion of protein than either corn fodder or 

 tiniotliy hay but less than clover hay. In proportion to the amount of digestible 

 matter which it contains it is a relatively expensive feed, costing more per pound of 

 digestible matter than any of the feeds named in the table with the exception of 

 cotton-seed meal. The indications of the digestion experiments, therefore, are that 

 the feed contains only a moderate amount of actual food and that it is too costly to 

 compete with more familiar feeding stuffs." 



Two feeding trials were made to test cotton-seed feed, each with 2 

 lots of 3 cows each. In the first trial a ration of 8 lbs. of bran and cotton- 

 seed feed ad libitum was compared with one of 7 lbs. of corn meal, and 

 3 lbs. of cotton-seed meal with corn fodder and clover hay ad lihitum. 

 These were fed in 2 alternating periods of 21 days. The milk was 

 weighed and composite samples taken for testing. Some difficulty was 

 experienced in inducing the cows to eat the cotton-seed feed. 



The 2 rations contained practically the same amount of dry mat- 

 ter, but the cotton-seed feed ration contained considerably less digest- 

 ible matter, owing to its low rate of digestibility. The average results 

 of the trial are summarized in the following table: 



Average results of comparison of rations on milch coiva. 



' Assuming 0. 85 lb. of butter fat to Bake 1 lb. of butter. 



