H-55 Efficiency of Feed Utilization in Poultry Production. R. C. Ringrose, 

 W. 0. Merrill, R. M. Vondell. 



H-60 Problems Involved in the Vaccination of Infectious Bronchitis. W. R. 

 Dunlop, R. G. Strout. 



H-73 A Study of Methods in the Development and Management of Pas- 

 tures for Growing Pullets. R. C. Ringrose. 



H-78 The Isolation and Control of Chronic Respiratory Disease in Chickens 

 NE-5 and the Relationship to the Satisfactory Immunization with New- 

 castle Disease and Infectious Bronchitis Vaccines. W. R. Dunlop. 

 M. B. Lonsdale, R. G. Strout. 



H-81 Factors Influencing the Market Quality of Eggs on New Hampshire 



Farms. W. C. Skoglund, Theodore Tzianabos. 

 H-88 Influence of Light and Humidity Upon the Physical Condition of 

 NE-8 Broilers. W. C. Skoglund. 



H-92 Recurrent Selection vs. Closed Flock Selection for Improving Broiler 

 NE-6 Qualities. W. M. Collins. 



S-55 Factors Influencing Sexual Maturity of Pullets. R. C. Ringrose. 

 S-56 The Effect of Low Level Chermotherapeutic Drugs in the Control of 



Coccidiosis in Growing Birds and Their Subsequent Performance in 



the Laying House. W. R. Dunlop. 



S-62 A Study of the Complication of Pleuropneumonialike Organisms when 

 Newcastle Disease and Infectious Bronchitis Vaccinations (Dust) 

 Are Carried Out. W. R. Dunlop. 



State Services 



Inspection of Fertilizers and Feedingstuffs 



The laboratory analyzes the official samples of fertilizers and feedingstuffs 

 collected by the inspectors for the State Department of Agriculture. This is 

 in accordance with state laws regulating the sale of fertilizers and feeding- 

 stuffs. 



During the year ending June 30, 1956, 174 official samples of commercial 

 fertilizers and fertilizer material were submitted for analysis. Of these 108 

 were complete fertilizers, 17 were superphosphate, 18 contained phosphoric 

 acid and potash, and the rest were miscellaneous materials. Of the total 

 number, 106 equalled or exceeded all guarantees. The penalty clause of the 

 new law was invoked for the first time and adjustments were made by the 

 manufacturer on a total of 18 cases. In general the manufacturers continue 

 to supply good products to help increase the productivity of our farms. De- 

 tailed results of the analysis of these samples are published in Bulletin 432 

 of this Station. 



The Control Supervisor submitted 702 official samples of feedingstuffs for 

 analysis during the fiscal year. Of these 55 were cat and dog foods and 647 

 were livestock and poultry feeds. The deficiencies were in general small and 

 indicate good milling practice by the manufacturers. The use of "bulk deli- 

 very" for feed is increasing and 43 samples were drawn from such lots. A 

 beginning was made in the analysis for drug content of feeds labeled as 

 supplying drugs. Lack of sufficient help prevents a complete analysis of such 

 materials. Samples deficient in protein amounted to 7.8 percent of the total 



