1086 



EXPERIMENT STATION RECORD. 



usually four hours, for several days, after which the analyses were con- 

 tinued at longer intervals for some time. In addition to analyses, the 

 physical properties of the samples, behavior toward rennet and toward 

 heating, etc., were noted. 



In the case of 1 cow (North Ditmarsh) 5£ kg. of colostrum was milked 

 seven hours before calving to relieve the cow. It had a red color and 

 contained numerous blood corpuscles. Immediately after calving the 

 colostrum was a yellowish brown color, and no blood corpuscles could 

 be recognized. 



A portion of the analyses of the cow's milk for the first four days after 

 calving are given below. 



Analyses of colostrum of three coivs. 



Total 

 solids. 



Fat. 



Nitrogen. 



Total. 



Albumi- Nonalbu- 

 noid. minoid. 



Total 

 albumi- 

 noids. ' 



Ash. 



"North Ditmarsh cow (6 yrs. old) : 



Seven hours before calving 



Immediately after calving 



Four bonis after calving 



Twelve hours after calving 



Twenty-four hours after calving. 



Two days after calving 



Three days after calving 



Four days after calving 



Simmenthaler row (4 yrs. old) : 



Immediately after calving 



Four hours alter calving 



Twelve hours after calving 



Twenty-nine hours after calving. 



Two days after calving 



Three days after calving 



Four and one-half days after 



calving 



Dutch cow (6 yrs. old) : 



Immediately after calving 



Four hours alter calving 



Twelve hours after calving 



Thirty-two hours after calving. .. 



Two and one-third days after 

 calving 



Nearly four days after calving. . . 



Per ct. 



19. 5« 

 23.21 

 17.65 

 13. 05 

 12. 9:s 



9.50 

 14.13 

 14.47 



27.91 

 26.30 

 15.77 

 14.10 

 15. 60 

 15.72 



12.83 



26.11 



20. 23 

 1(1.-7 

 15. 92 



15.40 

 13. 59 



Per ct. 

 2.97 

 5.10 

 3.48 

 1.78 

 1.51 

 2.27 

 4. 03 

 4.78 



5.52 

 7.63 

 3. 37 

 4.14 

 4.84 

 4.26 



3.0!) 



( 2 ) 



4.43 

 3.46 



Per et. Percent. Percent. 

 0.57 

 .15 

 .16 

 .23 

 .11 

 .04 

 .04 

 .05 



.89 

 .98 

 .34 

 .15 

 .09 

 .11 



.15 

 .62 

 .52 

 .17 



.16 

 .10 



Per cent. 

 9.64 

 12.95 

 9.91 

 5.95 

 4.63 

 3.85 

 3.66 

 3.82 



14.37 

 8.41 

 5.59 

 4.40 

 3.94 

 3.59 



3.41 



14.43 

 9.42 

 6.87 

 6.78 



5.17 

 4.24 



Per ct. 



0.86 

 .79 

 .60 

 .84 

 .81 

 .80 

 .72 

 .74 



1.04 

 1.02 

 .75 

 .89 

 .79 

 .83 



.81 



.92 

 .60 



1 Albuminoid nitrogen X 6.37. 



2 Fat determinations lost. 



There appeared to be no characteristic relationship between breed 

 and the composition of the colostrum. The greatest change in the 

 colostrum took place within the first few hours after calving. It gradu 

 ally became like normal milk, which it resembled in outward appear- 

 ance and in its behavior toward rennet and toward heating, in from 

 three to four days, although not constant in composition until several 

 days later. The colostrum of the Dutch cow differed from that of the 

 others in giving an amphoteric reaction 12 hours after calving, while 

 that of the other cows was acid for the first three or four days. In no 

 case did the colostrum have an unpleasant odor or taste, and this was 

 true of the colostrum of 8 other cows which was tested. 



The colostrum contained considerable quantities of nonalbuminoid 

 nitrogen, which diminished after a day or two, although small quanti- 

 ties were found in the normal milk. It is believed to have consisted 

 principally of urea, although amids may have been present also. 



