The use of medicated feeds for special purposes is steadily increasing 

 in volume. Special directions for feeding are printed on the tag attached 

 to each bag of such feed. When a drug or antibiotic is in a feed, the tag 

 must clearly state that fact. The use of drugs in feeds for the control of 

 certain diseases must be carefully investigated and meet the approval of 

 the Food and Drug Administration before it is put on the market. The 

 laboratory has analyzed many of the feeds tagged as containing sulfaquin- 

 oxaline this year and found no serious deficiencies. 



It is not within the scope of this bulletin to make recommendations re- 

 garding the use of commercial feedingstuffs. The Department of Dairy 

 Husbandry and the Department of Poultry Husbandry are continuously 

 studying feeding problems. The following publications of these depart- 

 ments are free to residents of New Hampshire. Address your request 

 to Mail Service, University of New Hampshire, Durham, New Hampshire. 



Ext. Bull. 67 



Ext. Cir. 274 



Ext. Cir. 282 



Sta. Bull. 401 



Ext. Bull. 114 



Turkey Production in New Hampshire, 16 pp. 

 Brooding and Rearing Chickens, 20 pp. 

 Dairy Calves. 



Feed Standards for N. H. Broilers. 

 Feeding Dairy Cattle. 



While the word feedingstuff does not appear in all the above titles, no 

 publication is included which does not discuss some aspect of the use of 

 feedingstuffs. 



Inquiries occasionally are made regarding a method of calculating 

 the protein, fat or fiber content of a home-mixed feed. There are tables 

 available, such as those in Morrison's book "Feeds and Feeding," which 

 give the average chemical analysis of feed concentrates, roughage, and 

 silages. It should be pointed out that the chemical analysis of a particu- 

 lar lot of an ingredient may be somewhat above or below the average figure 

 shown in the table. This fact must be taken into consideration in fixing 

 guarantees. The following example shows how the protein content of a 

 feed mixture may be calculated. 



Ingredients 



pounds used 



percent 

 protein in 

 ingredient 



lbs. protein 



furnished by 



ingredient 



The mixture contains 



225 



1410 



X 100 = 15.95% protein. 



The percentage of fat or fiber may be calculated in a like manner by 

 substituting the fat or fiber figures for those of the protein. 



