8 4 



Scientific Proceedings (57). 



was withdrawn again. The yield was 1.2 lbs. and the fat content 

 II. 2 per cent. Between the injection and second milking the 

 uterus had been washed out by the surgeon, so that the conditions 

 under which this experiment was made were very unfavorable. 

 At 5.45 p.m. the cow was milked again but only two ounces was 

 obtained with a fat content of 9.5 per cent. On the next morning 

 there was a marked falling off in the quantity of milk but the per- 

 centage of fat was about the normal, viz., 4.8 per cent. 



On the evening of February 4 a control experiment was made 

 as follows: The cow was milked dry at 4.45 p.m., and again at 5.45 

 p.m. The first yield was 5.4 lbs. — fat 5.9 per cent., and the second 

 about one ounce, — fat 9 per cent., the result of "stripping." 



TABLE 11. 



Jersey Cow; Age 6 Years; Weight 950 Lbs.; Last Calf Born Sept. 23, 1913. 



Weight of Milk in Pounds. 



Morning. 



Kvening. 



Percentage of Fat. 



Morning. 



Evening. 



12 



10.3 



8.9 





13 



10. 0 



9-3 





14 



10. 1 



8.7 



6.6 



IS 



10.4 



9-3 



6.4 



16 



6.0 



10. 1 



5-4 



17 



7.0 



10.4 



4.4 



18 



11. 2 





6.6 



7.0 



6.2 



On February 15, at 5.15 p.m., this cow was milked dry and 

 yielded 8.3 lbs. containing 7 per cent, of fat. The Ringer's solu- 

 tion extract of eight pituitaries (posterior lobes alone) was then 

 injected into the external jugular vein and three minutes after 

 the operation had been completed — at 5.30 p.m. — the udder was 

 again emptied. At this second milking one pound was obtained 

 with a fat content of 19 per cent. On milking a third time, 15 

 minutes later, not more than two ounces could be withdrawn; in 

 this the percentage of fat was 10.5. Next morning (February 16) 

 there was a marked drop in the quantity of milk and some diminu- 

 tion in the percentage of fat. 



On the evening of February 16 a second experiment was made 

 on this cow. At 4.45 p.m. the udder was completely emptied 

 and yielded 8.9 lbs. of milk with a fat content of 5.5 per cent. 

 Fifteen minutes later the cow was milked again when about one 



