76 MASS. EXPERIMENT STATION BULLETIN 449 



It appears significant (1) that the percentage of Group III cows in the 19 herds 

 is approximately twice as great as in the 56 smaller herds, and (2) that nearly 

 one-half of all the cows tested had mastitis on the initial test. A study of the 

 test results of the 75 herds revealed that 81 percent of the herds had some cows 

 in Group II, 47 percent had some cows in Group III, and 37 percent had cows 

 in both of these groups. 



The percentage of cows having mastitis in the 22 State-owned herds was found 

 to be approximately the same as in private herds, but a higher proportion of the 

 cows, 38 percent, was in Group III. In Group II there were 11.5 percent. The 

 average number of cows milked in the State-owned herds was 54, while in the 

 private herds it was 15. 



WALTHAM FIELD STATION 

 Waltham, Massachusetts 

 Ray M. Koon, In Charge 



The members of the research staff of the Waltham Field Station are assigned to 

 this branch by the Departments of Botany, Entomology, Floriculture, Horti- 

 culture, and Vegetable Gardening. Refer to reports of these Departments for 

 results of investigations conducted at this Station. 



PUBLICATIONS 

 Bulletins 



440 Apples as Food. By William B. Esselen, Jr., Carl R. Fellers, and Marie S. 

 Gutowska. 32 pp. August 1947. 



Apples owe their widespread popularity to their attractiveness and 

 palatability. Now with recognized food values assigned to them, apples 

 also assume importance as a "protective food" in the American diet. This 

 bulletin summarizes information on composition and nutritive value. 



441 Annual Report for the Fiscal Year Ending June 30, 1947. 72 pp. Sep- 

 tember 1947. 



The main purpose of this report is to provide an opportunity for pre- 

 senting in published form, recent results from experimentation in fields or 

 on projects where progress has not been such as to justify the general and 

 definite conclusions necessary to meet the requirements of bulletin or 

 journal. 



442 Mortality Studies in Rhode Island Reds, II. By F. A. Hays. 8 pp. July 

 1947. 



Mortality from all causes is one of the most important problems of 

 poultrymen. This report gives the final results of an attempt to breed 

 lines of Rhode Island Reds resistant or susceptible to mortality from all 

 causes. 



443 The Inheritance of Intensity of Laying in Rhode Island Reds. By F. A 

 Hays. 12 pp. July 1947. 



Intensity of laying is one of the most important characters associated 

 with high fecundity. Particular attention is given in this report to dif- 

 ferent methods of measuring intensity and to evidence regarding its in- 

 heritance. 



