A recent research study of conventional and outdoor antimicrobial-free (no antibiotics) production systems showed pigs raised outdoors without the use of routine antibiotics carried more bacteria and parasites, according to Feedstuffs newspaper. The research sampled pigs from three states (WI, NC, OH) and compared “niche-market, outdoor and antimicrobial-free (no antibiotics)” to “intensive indoor (conventional)” rearing systems.
Blood tests showed the outdoor pigs had significantly more exposure to Salmonella and Toxoplasma. Two pigs from different outdoor farms had antibodies to Trichinella. Trichinella is the parasite that infests muscles, and is the primary reason we have all been conditioned to cook pork thoroughly. The parasite has been virtually eliminated from conventional rearing systems.
I admit to being a little surprised by the research. In keeping with my science-geek image, I tracked down the authors, who very kindly sent me a copy of the original research paper. The research seems solid, and the stats are supported by other research in this country and in Europe.
So why the higher infection rate in outdoor pigs? The reasons given by the authors include exposure to wild and domestic animals (i.e. cats can carry trichinella), and access to soil and moisture which are viable environments for pathogens.
The skeptic in me can’t help wondering exactly what the outdoor systems studied were? Were they just raised in outdoor pens, or were they “pasture-raised” where they were foraging for a significant part of their diet? It is common in the chicken industry, where “free-range, vegetarian-fed” chicken and eggs abound, for such chickens to have access to the outdoors, but be no more pasture-raised than if they were confined indoors.
It is important to remember that many production practices that come under fire, such as indoor rearing and antibiotics, were put into place to increase food safety and/or animal welfare in response to increasingly intensive animal production. Merely removing these practices without addressing the reasons they were implemented in the first place does not necessarily bring about the benefits to humans or animals envisioned by consumers who purchase based on a “free-range” label.
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