

butter produced in the North Central region and therefore at 

 least 77 percent of the total production for the country. 



Table 1. — Amount and percentage of the total United States creamery butter output 

 produced by the participating States and the regions represented 



Region represented 



States 



in 

 region 



Annual butter 

 production 



States 

 partici- 

 pating in 

 survey 



"Annual butter 

 production 



North Central States. . . 

 South Atlantic and 



South Central States. 

 Rocky Mountain and 



Pacific Coast States. . 



Number 



12 

 13 

 11 



Million 

 pounds 



1,324.9 



151.1 



194.6 



Percent 1 



77.1 



8.8 

 11.3 



Number 



6 



3 

 5 



Million 

 pounds 



934.1 



6.6 



153.2 



Percent 1 



54.4 



.4 



8.9 



Total or average. . . 



36 



1,670.6 



97.2 



14 



1,093.9 



63.7 



1 Percentage of average Nation-wide output for 1942-43 — i.e., 1,718,600,000 pound 



The results for the 14 participating States in the 3 regions are 

 summed up in table 2. Of all the creamery butter produced in 

 these States, 35.7 percent may be considered as "winter" butter 

 with an average vitamin A potency of about 11,000 International 

 Units per pound; 64.3 percent is butter produced in summer 

 months when the cows are on pasture, and it has an average 

 potency of about 18,000 International Units per pound. The 

 grand weighted average, obtained by using the production in all 

 States in each group and the seasonal distribution in the partici- 

 pating States, is 15,529 International Units per pound, which is 

 as close as one can approximate the average vitamin A potency 

 of the total output of creamery butter in this country. 



In table 2 it will be noted that the winter butter produced in 

 the creameries in the various States of the North Central region 

 is quite uniform in vitamin A potency, the average being about 

 10,863 ± 267 International Units per pound. The potency of the 

 butter produced during the summer in this region varied con- 

 siderably more than that produced during the winter, the average 

 being 17,810 ± 870, and the coefficient of variation being about 

 twice that of the winter butter. The average annual potency of 

 the butter sampled and analyzed in the six North Central States, 

 which produce 54 percent of all the butter made in this country, 

 was 15,150 zb 535 International Units per pound. 



