214 ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 



By comparing plates 2 and 4 it can be seen that the 

 upper three broken lines across plate 4 are not so 

 irregular as the three lines across plate 2. This makes 

 it very probable that the greater the number of cows 

 in a dairy, the more uniform will be the production 

 from day to day. 



During the time of this record, May 1st to July 

 5th, these cows were exposed to uniformly dry weather. 

 The rainfall for the month of May was .89 in.; June, 

 2.19 in.; total, 3.07 inches. The average of 10 years 

 for these two months is 9.5 inches. 



It is also of some interest to compare the line repre- 

 senting the daily pounds of milk shown in plate 4 with 

 one showing the mean daily temperature. 



Although there are exceptions, this comparison shows 

 that as a rule the number of pounds of milk was low 

 when the mean daily temperature was high, and the 

 number was high when the temperature was low. In 

 other words, these two lines give something of the 

 appearance of an irregular picket fence with each picket 

 sharpened at both ends. 



The following table shows the highest, lowest and 

 average daily yield of milk, per cent, of butter fat, and 

 pounds of butter fat produced by each of six cows from 

 Mav 1 to August 1, 1891. 



•/ 





o 



i A 

















Patron No. 1. 









Patron 













Butter Fat 







Butter Fat 





Milk 





test or 







Milk 





Test or 







1891 



brt. lbs 





per ct. 





lbs 



brt. lbs. 





per ct. 





lbs. 



Aprl 9 



159 



X 



3.6 



= 



5.72 



653 



X 



4.0 



= 



26.32 



" 10 



151 



X 



3.6 



= 



5.43 



590 



X 



4.0 



= 



26.60 



" 11 



165 



X 



3.8 



= 



6.2? 



586 



X 



4.4 



= 



25.78 



" 13 



172 



X 



3.5 



= 



6.02 



5«7 



X 



4.6 



= 



27.00 



" 13 



16 r 



X 



3.6 



= 



K.01 



592 



X 



4.^ 



=«= 



26.64 



" 14 



172 



X 



3.6 



= 



6.19 



595 



X 



4.2 



= 



24.99 



" 15 



193 



X 



3.7 



= 



7.14 



580 



X 



4.4 



= 



25.52 



Total 



1179 









42.75 



4188 









179.85 



Average 





3.63 











4.30 







Test of 























c'mp'site 





















sample 







3.60 











4.31 









1179 





3.60 



= 



43.44 



4188 



X 



4.30 





180.0 



