More than 1,000 market weight hogs were killed last week after being overcome by pit gases at a hog farm near Tracy, Iowa.

According to Dr. Bob Leonard with KNIA/KRLS News, the owner explained that the facility was being monitoring on an hourly basis, and an investigation into the tragedy is ongoing. After the losses, the owner emphasized he is grateful no one conducting the monitoring was injured or killed.

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There are four powerful poisons can be present in manure pits, especially in those below the ground – hydrogen sulfide, ammonia, carbon dioxide, and methane. In August, manure pit fumes killed four workers in two separate incidents in Iowa and Wisconsin.

Read, “Manure pit fumes kill Iowa father, son”