92 



considerably more than their normal quantity of milk during- 

 the lactation period, which indeed might also be materially 

 lengthened by the judicious use of brewers' grains. 



(3) The effect of brewers' grains on the yield is relatively 

 greater early in the lactation period than it is later on, but 

 they cause a material increase in the yield even when used 

 comparatively late in the lactation period (Table XXXIV.,. 

 lot I.), an effect which is clearly not due to the mere change 

 of food. 



(4) The evidence of these experiments is not so conclusive- 

 as might be desired as to the effect of brewers' grains on the 

 percentage of butter-fat in the milk, but there are indications, 

 that early in the lactation period, they tend to slightly reduce 

 the butter-fat. (Table XXXI.) Towards the end of the lac- 

 tation period, they do not seem to have any appreciable effect 

 in this direction. (Table XXXY.) 



(5) In the case of cows whose mixed morning milk is- 

 habitually low in butter-fat, brewers' grains are probably not 

 a food to be recommended, having regard to the 3 per cent, 

 standard, and especially during the earlier portion of the 

 lactation period. (Table XXXI.) 



(6) The effect of brewers' grains on the non-fatty solids in 

 the milk is apparently unappreciable. 



(7) As regards the live-weight of the cows, the effect of 

 brewers' grains, in these experiments, was not in any way 

 striking, but it appears that they may cause an increase in the 

 milk yield and in the average live-weight simultaneously, 

 (Tables XXXIY. and XXXVII. , lot I.) 



(8) Speaking generally, and having regard to the milk 

 only, the best time to use brewers' grains for dairy cows is- 

 when the cows are well advanced in the lactation period, when 

 the milk yield is falling off, and when, as a rule, the butter- 

 fat is higher than it is early on. They may be a very useful 

 food under these conditions, but milk-sellers should use them 

 sparingly even then if their milk is regularly low in butter- 

 fat. 



