99 



From the average quantity of milk produced by the cows in 

 these Experiments K and L, it is fair to presume that they 

 were not such heavy milkers as those used in the Experiments 

 I and J, Bulletin No. 2. Speaking generally, heavy milkers 

 produce milk of somewhat poorer quality than cows of the 

 same breed which do not milk heavily. From the results 

 obtained in the preliminary trials, preceding Experiments K 

 and L, it may be said that both lots of cows produced milk 

 of good average quality. Taking the period of eight weeks, 

 the difference in the percentage of fat in the case of lot I. 

 shows an increase of '02 per cent., while in the case of lot II. 

 there is a decrease of '02 per cent. The difference is so slight 

 that it cannot be attributed to the effect of the brewers' 

 grains. The results over the period of ten weeks are prac- 

 tically identical with those obtained over the period of eight. 



It is usually the morning's milk which is below the 

 standard. In Experiment I those cows which received brewers' 

 grains produced milk every morning during the eight weeks 

 below the standard, while those which did not receive 

 brewers' grains in the same period only nine times below. In 

 a similar period during Experiment K, lot I. produced milk 

 below the standard on 42 mornings, while lot II. did the same 

 on 29 mornings only. That is, lot I. produced milk below 

 the standard on 13 mornings more than lot II. Over the 

 period of ten weeks this number of times is slightly increased 

 and is 15. 



On referring to Table XXXIX. it will be seen that the 

 milk of lot I. is somewhat poorer throughout in the morning's 

 and noon's milkings than lot II., but this is counterbalanced 

 by the evening's average quality being considerably higher. 

 It cannot be said that over the whole period of the experi- 

 ments the brewers' grains have had any effect in deteriorating 

 the quality of the milk. The Table XXXIX. also shows that 

 on two occasions the evening's milk of lot II. fell below the 

 standard. 



