Show Milk Mill Secretion Process in Cow Novel Experiment Conduct Conduct- Conducted ed at Federal Dairy Daily Farm at Beltsville Pre Prepared ared by the tha United States Stat De Department of or Agriculture A novel experiment to determine whether the milk In a cows cow's udder Ism Is m manufactured during the few minutes minutes min min- ut ut's utes s required for tor the milking process proc proc- ess as is generally general y taught or whether er er It Is secreted continuously and collected collected collected col col- In the udder previous to milking milkIng milkIng milk- milk Ing was cond ted recently at the federal federal federal fed fed- eral dairy experiment farm tarm at Beltsville Belts- Belts vine rule Md by W. W W. W Swett vett bureau of dairy Industry United States Depart ment meat of ot Agriculture A rather general general belief persists among teachers and other prote professional men In dairy cattle and veterinary work says Mr Swett that tho internal Inter inter- Internal nal capacity for storing milk In a cows cow's udder Is not more than a half halt pint to each quarter Since many cows yield much more than that amount It ItIs ItIs itis Is taught therefore that the milk must necessarily be manufactured during the process of milking and that It does not exist as milk until the mammary gland Is stimulated bythe bythe by bythe the milking operation Capacity of Cows Cow's Udder In these tests Il it was vas found however however how bow ever that a cows cow's udder is capable of ot holding from 11 to 20 quarts of milk instead of only a quart as is quite commonly taught For the tests two cows were killed their udders ImmedIately Immediately immediately Im Im- im- im mediately removed and mounted ona ona on ona a framework In a position for milking ng One of the cows had normally been giving gl about twelve pounds at a milk milk- ing A total of 1027 pounds of milk mm was drawn from her udder after all nil body connections had been severed sh showing t that at more than 85 per cent of her production was stored in her udder udder ud ud- lelder der at the time she was slaughtered The post-mortem post milking of the second second second sec sec- ond cow yielded practically 50 per percent percent cent of ot ber her norm normal l production In her case milking was more difficult and andaU andall andall all aU the milk was not drawn dra as was shown by the considerable quantity which gushed forth when the udder was later cut op open n. n A further Indication of the enormous enormous enormous enor enor- capacity of ot a dairy cows cow's udder has been shown by the qu quantity of liquid which Is often possible to Inject Inject Inject In In- into detached udders being prepared prepared prepared pre pre- pared for tor laboratory study Mr Swett says that it Is not uncommon to Inject in inject inject In- In the equivalent of three to five gallons of milk depending on different different differ differ- ent eat characteristics of various udders Continuous Process These few tests while not to be regarded regarded regarded re re- re- re as conclusive would indicate I says Mr Swett that milk secretion Isto isto Is Isto I to a considerable extent a l continuous I process and that a large proportion of the milk secured at any milking is is- collected and st stored red within the mammary mammary mammary mam mam- mary gland before milking is commenced commenced commenced com com- also that liberation of the milk from the gland Is not dependent either upon a nervous mechanical al stimulation or upon muscular contraction contraction contraction tion since all nU body connections had bad been severed before the post mortem milking was performed The mammary gland obviously Isone is isone isone one of the most Important parts of the dairy cow yet Its Internal anatomy Its Us capacity and Its performance are but little understood says Mr Swett The project now being conducted by bv bythe bythe the bureau of dairy industry to determine determine determine deter deter- mine the relation of the conformation and anatomy of the dairy cow to her milk and fat butter-fat producing capacity has been developed to include an ex extensive extensive consideration of the mammary gland This new newest est phase In the study of the mechanism of the dairy cow promises to be most Interesting and very productive of of valuable tion |