3
Feed Additives
Roxarsone (arsenic)
- Mainly used as an antimicrobial and growth promoter in chickens
and hogs
- Approximately 2 million pounds of arsenic are emitted into the
environment from U.S. poultry operations (Garbarino, 2003)
Hormones
- Antigens, estrogens, progesterones
- 95 percent of feedlot cattle receive hormones for growth
production
Antibiotics (see next slide)
Other animal waste products
- Poultry litter is commonly used as feedstuff in cattle
Recommended resource: Sapkota et al. (2007). What do we feed to
food-production animals? A review of animal feed ingredients and their
potential impacts on human health. Environ Health Perspect, 115, 5,
663–670. (see course reading list)
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