lyOG.] PUBLIC DOCUMENT— No. 33. 81 



The a))ove figures are based on the average whok'sale 

 prices of middlings and gluten feed for the year 1904, plus 

 10 per cent. ; namely, $26.70 for middlings and $27.72 for 

 gluten feed. Bibby's dairy cake cost $30 a ton. The cal- 

 culations show that a ton of wheat middlings furnished rather 

 more digestible matter than a ton of Bibby's dairy cake, and 

 at a somewhat less cost a })ound. They further show that, 

 if 1,550 pounds of digestible matter in a ton of gluten feed 

 could be purchased for $27.72, 1,232 pounds, being the 

 quantity contained in a ton of Bibby's dairy cake, ought not 

 to cost over $22. In other words, Bibby's dairy cake at $30 

 a ton furnishes digestible matter at some 37 per cent, ad- 

 vance over that contained in gluten feed at $27.72 a ton. 



Feediwj IfJxptruneut tcllh JJibby't^ Dalrij Cake, /Sj^rinr/, 



1904. 



Ill order to lest the efhcacy of this cake as a food for milk 

 l)roduction, four cows were divided as evenly as jiossible 

 into two groups, and fed b}- the reversal method. All of 

 the cows received lirst-cut hay, roweii and bran as a basal 

 ration. In the first half, two of the cows received a definite 

 quantity of the dairy cake and the other two a like quantity 

 of gluten feed ; in the second half, these two grain feeds were 



reversed. 



Duration of Experiment. 



Care of the AnimaJf<. — The cows were kept in roomy 

 stalls, well carded, and turned into the yard some six or 

 more hours each pleasant day. 



Method of Feedhiy. — The animals were fed twice daily, 

 the hay ))eing given aljout an hour I)efore milking, and the 

 grain mixtures just l)efore milking. The several grains 

 were well mixed before being fed. Bibby's dairy cake was 

 ground to the fineness of ordinary meal. Water was sup- 

 1^1 ied the animals constantlv h\ means of a self- watering; 

 device. 



