20 



the same time the other three cows were receiving the salt hay ration ; 

 in the second half these conditions were reversed. 



ISamiMvy feeds and milk : A sample of milk was taken twice daily 

 for four consecutive days, and this composite sample was held to 

 represent the composition of the milk for the wetk. 



A small sample of the two grains was taken daily, and preserved 

 in glass bto[)pered bottles until the end of each half of the experi- 

 ment. Very slight moisture variations were noted. A hay sample 

 was taken weekly, tested for water present, and preserved. An 

 occasional sample of ensilage was taken, and the several samples 

 eventually mixed and analyzed. 



Daralion of each experiment : It was intended to have each exper- 

 iment last :^i days, but owing to lack of time before the warm weather 

 begiui, this 21 day period had to be reduced in sonie cases to 14 or 

 17 days. A preliminary period of o or 7 days, and in some cases 

 longer, always preceded the period itself. 



Weighing the animid^ : Hlach animal was weighed for three con- 

 secutive days at the beginning and end of each half of the experi- 

 ment, the difference between thi se three aver:ige weijihts in each 

 case representing the gain or loss in live weight during the half. 



P^XPhRIMENT I.* 



Black grass ration vs. English hay ration. Average results with 

 six cows for 21 days : 



FEEDS CONSUMED PER COW DAILY. (Ibs.) 



Corn Wlieat Chicago 



Ration. Blacli: grass. English haj'. ensilage. bran, glnten meal. 



Black grass, 12.77 — 22 42 5 2.(17 



English hay, — 11.83 22.50 5 2.67 



AVERAGE DRY AND DIGESTIBLE MATTER PER COW DAILY. (Ibs ) 



Totiil Carbo- Total Nutritive 



Ration. dry matter. Protein, hydriites. Fat. dijiestible. ratio. 



Black grass, 22.23 2.22 10 50 .55 13.27 5.3 



English hay, 21.90 2.14 11.15 .54 13 83 5.8 



TOTAL GAIN OR LOSS IN LIVE WEIGHT FROM SIX COWS. (Ibs.) 



Black grass ration, — 28. 



Eng'ish hay, -|-18. 



* The actual yield of milk and butter ot one experiment cannot be compared with 

 the yields of milk and butter of another, for the reason that the exj eiinients weie 

 made at different times during the year and with different cows. Only the percent- 

 aye increase or decrease of each experiment is eon, parable. 



