664 



Bulletin 82. 



side the general average for the first four weeks and the average 



for the last two weeks and five days. 



Average for ist twenty-eight days: 



Freda Daisy Bertha 



lbs. lbs. lbs. 



41.31 43.51 19.23 2S46 



Average for last nineteen days : 



Belva Molly Freda Daisy Bertha 



lbs. lbs. lbs. lbs. lbs. 



36.00 42.87 40.51 16.76 26.13 



Belva 



lbs. 



38-10 



Molly 

 lbs. 



—2.10 +1.56 — 3-00 —2.47 —2.33 



Molly has gone on improving but the others show a very de- 

 cided falling off which is greater in the noninjected Freda than in 

 the injected Daisy, and greater in the uninjected Bertha than in 

 the injected Belva. 



Oscillations. The variations above and below the general aver- 

 age for each animal injected and not injected with tuberculin will 

 be very clearly seen by glancing at the tables giving the graphic 

 illustration for two Holsteins and two Jerseys (Tables VIII and 

 IX) . In figures they may be shown as follows : 



Belva. General average per day 37.247 lbs. Highest per day 

 42.25 lbs. Lowest per day 31.50 lbs. 



Freda. General average per day 41.78 lbs. Highest per day 

 47.50 lbs. Lowest per day 34.50 lbs. 



Daisy. General average per day 18.26 lbs. Highest per day 

 22.25 lbs. Lowest per day 15 lbs. 



Bertha. General average per day 27,01 lbs. Highest per day 

 33.5 lbs. Lowest per day 23 lbs. 



Molly. General average per day 41.19 lbs. Highest per day 

 48 lbs. Lowest per day 33.5 lbs. 



The extremes it will be observed were actually greater for the 

 cows that were not treated with tuberculin than for those so 

 treated. Among the Holsteins Belva had a variation amounting 

 to 10.75 lbs., Freda one of 13 lbs., and Molly one of 14.5 lbs. 

 Among the Jerseys, Daisy had a variation of 7.25 lbs. and Bertha 

 one of 10.5 lbs. Extreme variations in the yield of milk then 

 cannot be charged on the action of a test dose of tuberculin in- 

 jected into a healthy animal, nor of a series of such test doses 

 administered at intervals of a week. 



