By Adityarup Chakravorty
Chicken is the most consumed protein in the United States. According to the National Chicken Council, the U.S. produced more than 9.2 billion broiler chickens in 2019. US consumers spent more than 95 billion dollars on chicken products.
Broiler chickens raised on floor pens covered with litter composed of pine shavings at the University of Georgia’s poultry research center.
All these broilers – chickens raised for meat – need millions of tons of litter, or bedding material. Reusing chicken litter can save costs. There exists some health and safety concerns though.
Surprisingly, a new study shows that the environment in reused poultry litter can actually deter growth of pathogens like Salmonella.
“When you read or hear that broiler litter is reused to raise multiple flocks of chickens, the typical reaction is that it must be bad for food safety,” says Adelumola Oladeinde, a co-author of the recent study. “Our study demonstrates the exact opposite.”
Oladeinde is a researcher at the USDA’s National Poultry Research Center in Athens. He and his colleagues found that ‘good’ bacteria in used poultry litter can hinder Salmonella growth.
“It may be worthwhile to invest time and resources to characterize the bacteria in reused litter,” says Oladeinde. “We can develop the promising ones into beneficial microbes for better chicken gut health.”
The study also explored litter characteristics, such as moisture and ammonia levels. These characteristics can dramatically affect the litter microbiome – the mix of bacteria, fungi, and viruses in litter.
Bacterial isolate from reused litter with competitive exclusion potential against Salmonella growing on sheep blood agar.
“Our findings provide new information on the relationship between the physical environment of broiler litter and its microbiome,” says Oladeinde. “Management techniques that account for both factors may help reduce Salmonella in chickens.”Click here to see more...
Chicken litter plays a big role in determining broiler health. After a broiler chick gets to a farm, it usually spends the next several weeks pecking and living on litter.
In fact, chicks begin to eat litter even before eating from feeding troughs or drinking. The microbiome present in the litter likely become the ‘first settlers’ in the guts of the chicks.
“These first microbes play a key role in determining gut health,” says Oladeinde. “Therefore, it is critical to determine what a beneficial litter microbiome looks like.”
The team collected samples of reused poultry litter from the University of Georgia Poultry Research Center. The litter was used to raise three flocks of broiler chickens under conditions like those used in broiler farms. “Each sample represents a unique broiler litter environment,” says Oladeinde.
In the lab, researchers measured characteristics of the litter samples. Then they added Salmonella to each sample. After that, the samples were tested for levels of Salmonella, other bacteria, and physical characteristics.
Within two weeks of adding Salmonella, most samples developed predictable microbiomes. Certain microbes, such as Nocardiopsis bacteria, seemed to reduce growth of Salmonella.