140 



130 



xl20 



C5 



UJ 



S 



X 



a 110 

 m 



: 100 



o 



UJ 



a. 



90 - 



80 



70 



ROOKERY PUPS 196^53 

 963 



\\0 

 ^•OiV'1966 



A^;;-'" aPNO.2* 



"^"tt^J^ ,965 



14 



DAYS 



21 



28 



35 



Figure 26. — Best individual growth records of captive pups fed artificial diets during each of 4 years, St. Paul 

 Island, 1963-66. Average weights of samples of naturally fed rookery pups in 1964 (numerals indicate number of 

 pups weighed) and of one rookery pup in 1963 are shown for comparison. The solid horizontal line indicates 100 

 percent of birthweight. 



ANALYSIS OF FUR SEAL MILK 



Since 1963, six samples of fur seal milk 

 taken at different stages of lactation have been 

 analyzed for gross composition, fatty and 

 amino acids, and nitrogen distribution by the 

 Department of Dairy Sciences, Washington 

 State University. 



In July 1965 a sample was collected im- 

 mediately post partum to test for colostrunn 

 milk, which contains high levels of albumin 

 and globulin. The level of these components 

 was 50 percent higher than in milk from later 

 lactation (Ashworth, Keyes, and Ramiah, 1966). 

 In another sample of colostrum milk obtained 

 in July 1966, the values for albumin and 

 globulin were 150 percent higher than in 

 samples collected later in lactation (table 45). 

 High levels are presumed to indicate antibody 

 transfer through the milk. 



Table 45. --Distribution of nitrogenous compounds in fur seal 

 milk by percentage of total nitrogeni.' 



1/ A sample taken in 1963 is not included because nitrogen 

 distribution was not determined. 



2/ U.S. Ashworth, 1966, unpublished data. 



The average gross composition of six 

 samples of fur seal milk is given in 

 table 46. 



46 



