FOOD EFFECT ON MILK SECRETION. 225 



were used in the experiment four full milkers and four strippers. The 

 slow milking took from two to two and one-half times as long as the rapid 

 milking. The experiment proved two things: 1st. The diminution in the 

 milk flow from one period to another; 2d. Essentially unchanged quality. 

 All the cows gave less when milked slowly, although in three cases the differ- 

 ence was but slight. The same station demonstrated that the quality is 

 lowered but the quantity increased by milking them three times a day. 



Two cows milked every hour for seventy-two hours gained both in 

 quantity and per cent, of fat. The gain the first day was much greater than 

 on the subsequent day. 1 



2 H. H. Dean tried milking diagonal teats to see if there would be an 

 increase in the milk production. With one cow there was no difference ; 

 with another, less milk was given. F. Albert tried a similar experiment 

 and found that by milking the quarters or diagonal teats that there was 

 a marked increase in the quantity. He was so sure of his conclusions 

 that he strongly recommends that this method of milking be always fol- 

 lowed. 



Dr. E. L. Sturtevant had the different quarters of the udder of a cow 

 milked separately a number of times, and the milk weighed, and the total 

 solids and fat determined. He found a marked difference in the quality 

 of the milk from different quarters of the udder. Dr. Babcock made a 

 similar experiment along the same lines and his results may be briefly stated 

 that, for any single milking the results fully confirmed those of Dr. Sturtevant 

 and showed a decided difference in the quality of the milk from different 

 teats: If, however, the whole series be considered it is evident that the 

 order in which the teats are milked is the chief factor which affects the 

 quality of the milk. Dr. Babcock says in conclusion, "It is doubtful about 

 there being any difference in the physiological function of the different 

 quarters of the udder." At the- Indiana Experiment Station like experi- 

 ments were conducted with the same results. At the North Carolina 

 Station cows milked one teat at a time showed a less per cent, of fat than 

 those milked as usiial. 3 



EFFECT OF EXERCISE. Though locomotion is detrimental to the yield 

 of milk, it is a mistake to suppose that uninterupted confinement in the 

 stall is the most economical treatment for a milk cow. With moderate 

 locomotive exercise, the slight reduction in quantity of milk appears to 

 be fully compensated by the increased yield of solids. Munk undertook to 

 to settle this point, and experimented with thirty cows and found that when 

 they were allowed half an hour daily exercise the total quantity of the milk 

 as well as the fat and casein increased, though much exercise exerted an 

 adverse influence on the yield. When cows are on grass their increased 



1 Bulletin 9, New Hampshire Agr. Exp. Station. G. H. Whitcher. 



2 Experiment Station Record, Vol. V., p. 965. 



3 Bulletin 116, North Carolina Agr. Exp. Sta. F. E. Emery. 



