Question: what are bulls used for on a farm
[{'answer': 'breeding', 'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 20, 'start_character': 36, 'end_paragraph_id': 20, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Management.:Beef production.\n'}]}, {'answer': 'as work oxen', 'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 20, 'start_character': 190, 'end_paragraph_id': 20, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Management.:Beef production.\n'}]}, {'answer': 'slaughtered for meat', 'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 20, 'start_character': 97, 'end_paragraph_id': 20, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Management.:Beef production.\n'}]}, {'answer': 'herd maintenance', 'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 31, 'start_character': 153, 'end_paragraph_id': 31, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::Management.:Artificial insemination.\n'}]}, {'answer': 'work oxen for haulage', 'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 20, 'start_character': 193, 'end_paragraph_id': 20, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::Management.:Beef production.\n'}]}, {'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 521, 'bleu_score': 0.9381916242441871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10216178840956216702}, 'section': 'Section::::Management.:Beef production.\n'}]}, {'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 1020, 'bleu_score': 0.9608397208384941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10216178840956216702}, 'section': 'Section::::Management.:Artificial insemination.\n'}]}, {'provenance': [{'wikipedia_id': '40193909', 'title': 'Southern White Rhino ("Bull")', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Southern white rhino ("Bull") is a famous conservation success story for his species. Southern white rhinos were thought to be extinct in the late 1800s until a small herd was discovered. Since then, rhinos like Bull have been part of various international breeding programs', 'The Southern white rhino ("Bull") is a famous conservation success story for his species. Southern white rhinos were thought to be extinct in the late 1800s until a small herd was discovered.']}}]}, {'provenance': [{'wikipedia_id': '28227402', 'title': 'Bull', 'section': 'Section::::Management.:Beef production.\n', 'start_paragraph_id': 20, 'end_paragraph_id': 20, 'meta': {'evidence_span': ['Other than the few bulls needed for breeding, the vast majority of male cattle are castrated and slaughtered for meat before the age of three years, except where they are needed (castrated) as work oxen for haulage.', 'Wikipedia article: Bull - Section::::Management.:Beef production.\rOther than the few bulls needed for breeding, the vast majority of male cattle are castrated and slaughtered for meat before the age of three years, except where they are needed (castrated) as work oxen for haulage', 'Other than the few bulls needed for breeding, the vast majority of male cattle are castrated and slaughtered for meat before the age of three years, except where they are needed (castrated) as work oxen for haulage.']}}]}]