Rabon Poultry Feed Additive Fly Larvicide, 1974-1975

Twenty-five mature hybrid cross laying hens were assigned to each of 5 treatment groups and housed in semi-individual cages for a 10-day acclimation period prior to experimental evaluation. A 1% Rabon premix in ground yellow corn (Code SD 8447 10-37-16-4PMH) was thoroughly blended with 16% protein layer mash to establish treatment levels of 0, 6, 12.5, 25, and 50 ppm Rabon. Birds received feed and water adlibitum for 7 days following which time all food was removed for 18hr prior to fecal collection to prevent contamination. Fifty newly hatched first instar house fly, stable fly, or little house fly larvae of a susceptible strain were added to 100-gm aliquots of respective fecal samples. Ten replications of the house fly and stable fly evaluations were conducted; 5 replicates of the little house fly test were performed. Samples were held at constant conditions of 27°C and 70% RH for adult emergence.