32 



MILK HYGIENE 



ing milk in that the latter is richer in fat than the for- 

 mer. Numerous investigations have given very varia- 

 ble results that may be explained by the short duration 

 of the test, by the daily variations of the composition 

 of the milk, etc. Some larger experiments relating to 



LACTATION PEEIOD 



April 



May 



June . . . . 



July 



August . . . 

 September 

 October . . 

 November 

 December . 

 January 2 

 January 3 

 January 4 

 January 6 

 January 7 

 January 8 

 January 9 

 January 10 

 January 11 

 January 14 

 January 16 

 January 18 



Daily 



quantity 



of milk. 



Kg. 



11.55 

 11.95 

 10.45 

 8.82 

 9.66 

 9.07 

 7.67 

 6.63 

 5.11 

 3.0 

 2.7 

 2.8 

 2.3 

 2.4 

 2.3 

 2.3 

 2.1 

 2.2 

 1.9 

 1.3 

 1.4 



Specific 

 gravity. 



1.0291 

 1.0290 

 1.0287 

 1.0283 

 1.0287 

 1.0289 

 1.0292 

 1.0299 

 1.0300 

 1.0302 

 1.0300 

 1.0299 

 1.0307 

 1.0299 

 1.0304 

 1.0310 

 1.0308 

 1.0308 

 1.0277 

 1.0301 

 1.0288 



Fat. 

 Per cent. 



3.033 

 3.264 

 3.405 

 3.458 

 3.586 

 3.650 

 3.434 

 3.823 

 4.267 

 5.050 

 5.400 

 4.720 

 5.470 

 5.440 

 5.250 

 5.200 

 5.090 

 5.100 

 6.900 

 8.300 

 7.480 



Solids 

 not fat. 

 Per cent. 



8.140 

 8.166 

 8.113 

 8.027 

 8.149 

 8.230 

 8.247 

 8.501 

 8.616 

 8.823 

 8.843 

 8.680 

 9.032 

 8.824 

 8.911 

 9.054 

 8.980 

 8.982 

 8.565 

 9.446 

 8.958 



Fat content 



of the total 



solids. 



Per cent. 



27.15 

 28.56 

 29.56 

 30.11 

 30.57 

 30.72 

 29.39 

 31.01 

 33.11 

 36.40 

 37.91 

 35.22 

 37.71 

 38.14 

 37.07 

 36.48 

 36.17 

 36.22 

 44.60 

 46.77 

 45.50 



many animals and extending over a long period, have 

 proven that the morning milk does not differ from the 

 evening milk ia fat content when the period between 

 the milkings is equally great and the feed, the amount 

 of drinking water taken, etc., are the same. But in prac- 

 tice this is not the case, because usually a small dif- 

 ference exists, so that where there is a larger quantity 



