Apr. IS, 1919 



Quantity and Composition of Ewes' Milk 



25 



Table I. — Quantity and composition of ewes' milk — Continued 



A study of Table I brings out the fact that there is a great variability 

 in the percentages of the constituents of ewes' milk. Not only is this tru e 

 among the different breeds, but also during the lactation period of the indi- 

 vidual. The most constant constituent in the milk of all breeds exam- 

 ined appears to be lactose, while fat seems to be the most variable. The 

 difference in the percentages of fat is very marked, not only between the 

 breeds, but during the lactation period of the individual. These observa- 

 tions are in harmony with the results secured by Ritzman,^ who also 

 found that the fat varied at different lactation periods of individual ewes 

 and who concluded that — 



No great reliance can be placed on single tests of an individual, and that a test must 

 either cover a larger number of periods during one lactation of an individual or that 



I RiTZMAN, E. G., 1917. OP. CIT., p. 31. 



