You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

A fenbendazole oral drench in addition to an ivermectin pour-on reduces parasite burden and improves feedlot and carcass performance of finishing heifers compared with endectocides alone . Two studies utilizing 1,862 yearling heifers were conducted to determine the effects of a fenbendazole oral drench in addition to an ivermectin pour-on ( SG+IVPO ) , compared with an ivermectin pour-on ( IVPO ) or a doramectin injectable ( DMX ) alone , on parasite burden , feedlot performance , and carcass merit of feedlot cattle . In the first study , heifers receiving the SG+IVPO had fewer ( P = 0.02 ) cattle retreated for disease and 73 % fewer ( P = 0.06 ) worm eggs per fecal sample 98 d after treatment than heifers treated with IVPO . Heifers treated with SG+IVPO consumed more DM , had greater ADG , were heavier at slaughter , and had heavier carcasses than IVPO-treated heifers ( P < 0.05 ) . Heifers treated with SG+IVPO also had more ( P = 0.07 ) carcasses grading USDA Prime or Choice than IVPO-treated heifers . In the second study , heifers treated with SG+IVPO had fewer ( P < 0.01 ) worm eggs per fecal sample 35 d after treatment and had fewer numbers of adult and larval Cooperia and Trichostrongylus spp . in the small intestine at slaughter ( P < 0.10 ) compared with heifers treated with DMX . Heifers treated with SG+IVPO consumed more DM , were heavier at slaughter , and had heavier carcasses than DMX-treated heifers ( P < 0.01 ) . The SG+IVPO-treated heifers also had greater ADG ( P < 0.10 ) . The broad-spectrum effectiveness of a combination of a fenbendazole oral drench and an ivermectin pour-on reduced parasite burden and increased feed intake , ADG , and carcass weight in feedlot heifers compared with treatment with an endectocide alone .
{"Intervention": ["fenbendazole", "fenbendazole oral drench", "ivermectin pour-on ( SG+IVPO", "ivermectin", "doramectin injectable ( DMX ) alone", "ivermectin pour-on ( IVPO )", "SG+IVPO-treated"], "Outcome": ["carcass weight", "carcass merit of feedlot cattle", "heavier at slaughter", "heavier carcasses", "cattle retreated for disease", "numbers of adult and larval Cooperia and Trichostrongylus spp .", "greater ADG", "increased", "feed intake", "carcasses", "reduces parasite burden", "in the small intestine", "parasite burden", "feedlot performance", "fewer ( P = 0.06 ) worm eggs per fecal sample", "improves feedlot", "carcass performance", "fewer ( P \u003c 0.01 ) worm eggs per fecal sample"], "Participant": ["1,862", "parasite burden"]}