Studies in Milk Secretion 



93 



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1:3 ra a:3 e& 3:3 3:3 4,3 4.9 -5.3 £.9 *.3 6:9 7.3 7.9 3.3 as s.s 9.9 /0.3 /0.9 //.3 11:9 /z.3 



AGfAT GOMMF/iCfME-MT Of TtST 



Figure 23. Observational and Theoretical Curves of mean milk pro- 

 duction (365 day) at various ages in Jersey Cows. 



solute maximum production is reached. After the time of 

 maximum productivity the absolute production per unit of time 

 decreases with advancing age, and by a continually increasing 

 amount. This is essentially the same law that has been found 

 to govern the Ayrshire (10), the Jersey seven day (n), and 

 eight month records (3), the Holstein-Friesian 7 day and year 

 records (2, 3, 4) and the Guernsey year records (, 3). 



