Net wrap not twine: take precautions
December 22, 2016
BROOKINGS, S.D. – With advancements in bale binding technology, efficiency has increased. Today's net wrap increases baling efficiency by 75 percent over twine binding.
"In addition, net wrap also increases water shedding ability, resulting in less spoilage and outdoors storage losses," said Taylor Grussing, SDSU Extension Cow/Calf Field Specialist.
Due to these advantages, Grussing said that it's no surprise that an estimated 90 percent of producers have converted from twine to net wrap over the last decade.
However, Grussing said, producers need to remember that net wrap is not twine. So, although it was OK to leave twine on the bale when feeding or grinding, she does not encourage this practice with net wrap.
“Net wrapping is newer and the effects on cattle consumption is relatively undocumented,” she said. “When net wrap is not removed prior to feeding whole bales or grinding, there is a potential risk for cattle to ingest the net wrap along with the forage.” Taylor Grussing, SDSU Extension cow/calf field specialist
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"Net wrapping is newer and the effects on cattle consumption is relatively undocumented," she said. "When net wrap is not removed prior to feeding whole bales or grinding, there is a potential risk for cattle to ingest the net wrap along with the forage."
Net wrap ingestion potentially harmful
In 2008, veterinarians at University of Nebraska Lincoln and across the state reported large volumes of twine accumulation in rumens upon post mortem evaluations of beef cattle.
North Dakota State University diagnosed net wrap ingestion as the cause of an unexpected death in a feedlot heifer. A 2014 follow up study by Klein and Dahlen looked at net wrap digestibility compared to sisal and biodegradable twine. After 14 days of incubation in rumen cannulated steers, 70 percent of sisal twine disappeared while 0 percent, or none of the net wrap and biodegradable twine were degraded.
"Since net wrap does not appear to be digested in the rumen, it can accumulate which may have implications on production efficiency and animal health if the digestive system is compromised," Grussing said.
She added that the highest risk occurs when whole net wrapped bales are offered on cow/calf operations, however there is also potential for net wrap to accumulate even if particle size is decreased when utilized as tub ground hay.
"Risk of loss is likely related to how much opportunity cattle have to consume net wrap," Grussing said. "Cows fed exclusively long hay in net-wrapped bales from bale-feeders would likely be at the greatest risk."
Feedlot cattle fed a high-concentrate diet would have much less exposure, but could still accumulate significant amounts of net wrap.
Take it off
While it may not be possible to remove all the net wrap, Grussing said it's important to try, especially when feeding whole bales.
Net wrap removal can be done using a simple pocket knife or hot knives which are available for the more tangled mess. "Hot knives are especially handy in the winter when net wrap can freeze onto bales making it more difficult to remove," Grussing said.
When grinding bales, cattle producers likely won't be able to cut off net wrap as they go, so Grussing encourages them to prepare for the grinder a couple days ahead by removing net wrap from a few bales each day. "This method may allow you to get half of the net wrap off bales to be ground, which will result in less accumulation in the pile," she said.
If producers choose not to remove net wrap prior to feeding, Grussing suggested that they at least pick it up and throw it away after the bale is gone.
"Cattle get bored and like to chew on things so they will eat net wrap if it's laying around," Grussing said. "Taking the time to pick up net wrap in and around bale feeders is a simple way to reduce the chances of ingestion."
If you have questions on net wrap ingestion or how to conduct post-mortem evaluations, contact your herd veterinarian or an SDSU Extension Field Specialist.