193 



Table X. 



Showing Effect of the Period of Lactation on the Milk Fats. 



Time. 



Reiehert- 



Meissl 

 Number. 



Soluble 



Acids. 



Per Cent. 



Insoluble 



Acids. 

 Per Cent. 





36.68 8.20 



86.76 









35.75 8.09 



86.74 









33.19 7.59 



86.99 









33.80 7.56 



86.95 









33.63 7.47 



87.10 









33.57 7.55 



86.94 







7th month 



32.72 



7.49 



86.99 









31.63 



7.25 



87.41 









31.98 



7.10 



87.50 









32.03 7.12 



87.46 









26.64 



6.50 



88.20 







12th month 



30.48 



8. £6 



87.69 







The data in Tables IX and X represent results of experiments with three cows whose period of lactation com- 

 menced in October and November respectively. They were fed on a uniform ration throughout the entire period 

 of lactation with the exception that in July (the 9th month after calving) they were turned out on pasture. 



The above tables clearly show that the soluble fatty acids are highest 

 immediately after parturition, or at the beginning of the period of lacta- 

 tion. Slight irregularities excepted, they decreased as the period of lac- 

 tation advanced and were lowest toward the close of the period of lacta- 

 tion. 



It so happens that in most localities the majority of the cows drop 

 their calves in late spring, at a time when they also change from dry 

 feed to succulent pasture. This explains why in early summer both the 

 per cent of volatile fatty acids and the per cent of oleic acids increase 

 and the melting point decreases. 



13—280031 



