330 MILK FROM SEPARATE QUARTERS OF THE UDDER 



right hind-quarter left fore-quarter and left hind-quarter, respec- 

 tively : 



It is thus clear that the milk from the left hind-quarter of this cow 

 was much poorer in milk sugar and slightly poorer in fat and albumi- 

 noids than that from the other quarters. 



A similar phenomenon, in varying degree, was shown by many 

 other cows, and, in nearly all cases, the quarter which gave the 

 smallest total quantity of milk was lowest in solids-not-fat. It was, 

 however, not always the left hind-quarter of the udder which showed 

 this deficiency. 



Still more remarkable, in one case at least, the quarter of the udder 

 which gave the deficient milk changed between the end of July and 

 the beginning of November, and as marked a deficiency was then 

 noted in another quarter. 



That the proportion of fat in the milk from the separate quarters 

 should vary is not surprising, but that the soluble matter in the milk, 

 elaborated from the same blood stream, should show these large dif- 

 ferences is very difficult to understand. 



Influence of other circumstances. In addition to the influences 

 just discussed, there must be many others of which little is known. 



There seems to be little doubt that the average composition of the 

 milk yielded by a cow is mainly dependent upon the individuality of 

 the animal, but even when all known disturbing causes are elimin- 

 ated, her milk will be found to vary greatly from day to day. 



