A farm worker is a general title for someone that completes tasks in the agricultural industry. As a farm worker, your responsibilities may involve tending to livestock or crops. If you primarily work with crops, your job duties include irrigating soil, spraying fertilizer and pesticide solutions on fields, and harvesting crops with machinery or by hand. However, if you mainly work with livestock, your job duties include feeding the animals, cleaning their pens and cages, checking for sick or injured animals, administering vaccines and medications, branding livestock for identification, and herding livestock to specific areas.