61 



over a time period, which is found by weighing feed at the beginning 

 and end of the designated period and subtracting the two figures. 



Average daily consumption is therefore the total feed consumed 

 during a time period divided by the hen-days for the time period. 

 Addition of IGR's to Poultry Feed 



Insect growth regulators (IGR's) were added to the University of 



Florida Basal Layer Diet (Table 1). The basal diet was mixed in 



TM 

 136. ^-kg lots in a Kel ley-Duplex vertical mixer. When the basal diet 



was thoroughly mixed, ca . k.S kg were removed to a small paddle mixer 



where the appropriate amount of IGR was added while the mixer was in 



operation. This premixture was mixed for 10 min, returned to the 



vertical mixer, and added slowly to the mixing basal diet. After ali 



of the premixture was added, mixing continued for 10 min. Diets were 



removed from the vertical mixer in six 22.7"kg batches and placed in 



aluminum cans for ease of handling. Feed cans were labeled and dated 



for identification purposes. 



The vertical mixer was cleaned by swirling 11 kg of cracked corn 

 inside the mixer for 10 min. The corn was removed and discarded. Next, 

 fine feed particles were removed from the mixer with compressed air. 

 The paddle mixer was cleaned with a whisk broom and compressed air. 

 Mixers were always cleaned between mixes. 

 Topical Application of Granular IGR's to Poultry Manure 



In the manure collection area of one poultry house at the tilling 

 site, a granular IGR was applied to manure with a hand-held fertilizer 

 spreader. Granules were preweighed at the laboratory and the amount 

 for each treatment was individually placed in the spreader. The IGR 

 was applied uniformly to manure treatment blocks until the spreader 

 was empty. 



