Posts Tagged: livestock

Lawn-pocalypse! Surviving Drought

Ah, summer! The season of sunburns, pool parties, and… lawn droughts. If your once lush, green carpet now looks like a crunchy brown doormat, you're not alone. Let's dive into why your yard is staging a dramatic death scene and what you can do to...

Bermuda grass and weeds overtaking drought stressed turf grass.

A patch of former lawn, mostly dead, with a few green weeds and Bermudagrass

Fighting fire with feeding

Are cattle a secret weapon for taking on California wildfires?

California's cattle ranchers contribute a significant amount to the region's culture, economy and food supply, but do they also inadvertently help to temper the wildfires that have been plaguing the state? And if so, is it a better alternative – environmentally speaking – to letting grasslands burn?

A new study published in the journal Sustainability delves into the topic, weighing the advantages – and disadvantages – grazing cattle bring to the table. Researchers, including scientists from University of California, Davis and UC Agriculture and Natural Resources, set out to calculate the greenhouse gas emissions of cows consuming vegetation that would otherwise burn in wildfires. Then they estimated the GHG emissions that would result should that forage be untouched and therefore, consumed by fire, eventually comparing the two.

Feeling the burn

Given the severity of California's recent wildfires and the belief they will continue and even escalate in the near future, it's a discussion worth having, said Frank Mitloehner, an expert in animal agriculture and air quality from UC Davis, director of the CLEAR Center and one of the researchers who contributed to the peer-reviewed article.

“Each year from 2010 to 2020, California lost on average 89,000 acres of grassland to wildfires,” said Mitloehner, who is also a Cooperative Extension specialist. “In addition to the obvious disruption and devastation they caused, the fires spewed greenhouse gases and harmful particulate matter such as black carbon into the air and into our atmosphere. Those alone threaten climate health and human well-being.”

A fast and furious gas

Cattle are adept at eliminating herbaceous fuel as they graze. However, at the same time, their specialized digestive system produces methane that is expelled most often in the form of enteric emissions … more commonly known as belches. By way of background, methane is a potent greenhouse gas that warms the atmosphere at 25 times the rate of carbon dioxide over 100 years. But it's only in the atmosphere for 10 to 12 years after it's emitted. Following that, it's broken down into carbon dioxide and water vapor.

For that reason, Mitloehner refers to methane as a “fast and furious” gas. Furious because it warms with a vengeance and fast because it does so for only a short time, especially when compared to carbon dioxide. Furthermore, because of the biogenic carbon cycle, whereby plants extract carbon dioxide from the atmosphere for photosynthesis, the warming of methane and its byproducts can end entirely when it's hydrolyzed and used by plants.

How researchers calculated emissions

In order to determine if grazing, methane-emitting cattle are better for the atmosphere than burning grasslands, Mitloehner and the other researchers employed a method known as “Monte Carlo simulation,” a mathematical technique used by scientists to predict outcomes of an uncertain event.

Looking exclusively at methane emissions, they found it's better to have cows eat vegetation than to have wildfires burn it. Granted, it's only marginally better, but when one considers other advantages of animal agriculture and conversely, other disadvantages of widespread, uncontrolled fire, the conversation suddenly shifts.

“Even if cattle provided no other benefit to us, which certainly is not true, we can now make the case that they are helpful to us in yet another way,” Mitloehner said.

Friends or foes?

It goes without saying that one would be hard pressed to find much good to say about wildfires, but that doesn't hold true for animal agriculture. The industry provides jobs and supports the economy in other ways as well. Plus, it is a major source of protein-rich food that is in increasing demand as the world's population continues on a trajectory toward 10 billion people by the year 2050.

Where global warming is concerned, the industry is in the unique position of being able to reach net-zero warming, also known as climate neutrality, if it continues to aggressively chip away at its methane emissions, which Mitloehner asserts is of critical importance to the planet. “Few other sectors can reduce its warming to net zero and still be of service to society, but agriculture can because of the way methane behaves in the atmosphere,” he says.

To be clear, grazing cows are no match for wildfires. Yet, in addition to everything else the sector does for us, slowing the burn and keeping relatively more methane from entering the atmosphere are not nothing.

In addition to Mitloehner, authors of the study are Cooperative Extension advisors Sheila Barry, Devii Rao and Theresa Becchetti; Rowan Peterson, Ermias Kebreab and Minju Jung of UC Davis; and Felix Ratcliff and Kaveh Motamed of LD Ford. 

This article was first published on the website of the CLEAR (Clarity and Leadership for Environmental Awareness and Research) Center at UC Davis.

4-H youth project helps Siskiyou County prepare animals for emergencies

Planning brochure for pets, livestock fills crucial need as fires an increasing threat

With the McKinney Fire creeping closer to Yreka in the summer of 2022, Emily Jackson and her mother potentially faced the enormous task of getting all their goats, chickens, dogs and cats to safety – while Emily's father and twin sister Lindsay were away fighting the fires.

Fortunately, Emily and Lindsay had gained crucial knowledge about evacuating animals through a 4-H service-learning project they helped lead in 2018. A group of eight 4-H youths, ages 14 to 18, had created a “Pet Emergency Evacuation Plan” (PEEP) brochure, aimed at educating their neighbors in Siskiyou County about the necessary preparations for livestock and pets.

The brochure, available through the Siskiyou County website, remains in use today in this densely forested region that saw another spate of wildfires this summer. The PEEP project team was composed of Kylie Daws, Emily Jackson, Lindsay Jackson, Will Morris, Madison Restine, Maryssa Rodriguez, Emily Smith and Callahan Zediker.

Within those stressful hours in 2022 when the McKinney Fire prompted an evacuation warning during which residents could be required to leave at any moment, Emily Jackson said she and her mother had a game plan in place – thanks to her work on the PEEP project.

“At the time, it wasn't even on my mind,” Jackson said, “but looking back now, I know that having the experience from making that brochure was driving my thought process at the time.”

And while the Jackson family and their neighbors ultimately were not asked to evacuate in 2022, many community members have benefited from the hundreds of copies of the PEEP brochure in circulation, which prompts residents to at least think about what their animals would need in an emergency, Jackson said.

Pet and livestock evacuation tips were needed

Such a resource previously had not been available among the county's emergency preparation materials, according to Jacki Zediker, the 4-H regional program coordinator in Siskiyou County who advised the PEEP project group.

“One piece that was missing was how to help our communities understand that when they evacuate, and they take their pets with them…it's not as simple as just taking their pets with them,” said Zediker, citing the example that some shelters do not take in animals – or do not take animals without proof of vaccination.

Other items to add to the pet's emergency kit include food for several days, water, medications, comfort items or toys, and recent photos of the owner with their animal (proof of ownership).

Zediker had connected the young people with Jodi Aceves, senior deputy agriculture commissioner/sealer for Siskiyou County, who had been overseeing the county's Animal Control programs and emergency response.

“There's a lot of information out there for people evacuating, but not necessarily for livestock and pets,” Aceves said. “Unfortunately, we have had some fires where there were lots of pets and livestock lost.”

She met several times with the 4-H group, discussing the county's evacuation systems and processes and the role of the Office of Emergency Services and law enforcement agencies, and sharing key considerations in preparing for emergencies – such as having a pre-agreement in place with someone who could house an evacuee's animals.

Aceves praised the teens for distilling the vital information into a short and simple brochure that community members could easily read and remember. She also was impressed by the energy and genuine care that the young people put into the project.

“Most of their lives, every summer, they've been in fire,” Aceves said. “It's close to their hearts, and they've seen a lot of their neighbors and other people in the county either affected by fire or evacuated at some point.”

For Lindsay Jackson, in particular, fire and serving the community have been lifelong passions, inspired by her father's work in the area.

“My dad was a volunteer fire chief for the South Yreka Fire Department; he was doing that since I was about two or three, so I grew up watching him go to the trainings, go to a call,” she explained. “When I was 15, I joined the fire department as a cadet to help out with the medical side, but the more I volunteered, I really liked the fire side, too.”

Jackson added that Zediker has a special knack for nurturing and encouraging the interests of the 4-H participants and applying them in a productive way. 

“Jacki was really good at figuring out where our passions were and then how we could put our passions into a service-learning project,” she said. “She knew I was really big into fire and helping the community in that way since I was young.”

Zediker also helped the Jackson twins on their senior project, a fire-safety field day at the South Yreka fire station. More than 100 schoolchildren learned fire safety basics, met firefighters and emergency personnel, and heard about 4-H from Lindsay and Emily.

4-H experiences, mentorship inspire career paths

The PEEP project group also was asked by several organizations to share their knowledge about emergency preparations for animals. In addition to presenting a poster about their work at the 4-H California Focus conference in 2018, the group handed out the brochure and shared information at a table during a Juniper Flat Fire Safe Council workshop and resource fair.

Beyond distributing the PEEP brochure at 4-H club meetings, school events and community meetings, the youths have lent their voices to advocating for emergency resources for animals. Zediker noted that they contributed testimonials that helped the county acquire grants for purchasing more portable kennels.

But the most enduring impact of 4-H participation and community service, however, is that those experiences were a springboard for the young adults' careers. Emily Jackson – who participated in 4-H from age 5 to 19 – is now working toward a master's degree in biology at Cal Poly Humboldt, studying how fire suppression and other factors have changed plant communities in the Russian Wilderness.

Whether training colleagues as a U.S. Forest Service crew lead for the past couple of summers, or leading lab sections in general botany as a graduate student, Jackson said she draws on her 4-H experiences – and Zediker's inspirational example – as she pursues a career in teaching.

“In my development as a young adult into an adult now, I cannot overstate how big of a role Jacki played in that,” Jackson said.

Her sister Lindsay, meanwhile, has pursued her passion for fire all the way through the fire academy at College of the Siskiyous, where she also earned her emergency medical technician (EMT) license. Most recently working on fires near Pondosa in Siskiyou County, Jackson has been a seasonal firefighter based at the McCloud CAL FIRE station since 2020.

“It's hard because, in the last three years, I haven't left Siskiyou County, there's just been so many fires here,” she said. “But it's nice being able to help your community and know you're making a difference.”

Lindsay Jackson intends to pursue a bachelor's degree in leadership studies at Cal Poly Humboldt in hopes of getting a full-time position with CAL FIRE.

Managing toxic plants

Some plants thrive even in dry years, while others need wet years to really blossom. It's no surprise, then, that this year the University of California Cooperative Extension (UCCE) Fresno office has received several inquiries about potentially toxic...

Lambs grazing on pastures after wildfire show no significant adverse effects

Hopland REC turns 2018 River Fire devastation into research opportunity

The destructiveness of wildfire flames is easy to see, but dangers may lurk in the ashes they leave behind. A group of UC Davis scientists studied lambs at the UC Hopland Research and Extension Center, investigating whether pastures regrown after a wildfire cause toxic metal residues in grazing animals. The results, published in California Agriculture journal, showed that grazing on regrown pastures did not significantly alter the metal content of the lambs' meat and wool. That's good news for ranchers and consumers from a food safety perspective.

In 2018, the River Fire burned six miles north of Hopland, scorching two-thirds of the land at Hopland REC, including areas in its sheep station. Since Hopland REC conducts ecological and agricultural research, they had data and some meat samples from the sheep flock that lived on site before the River Fire occurred. 

“A bunch of researchers came together to brainstorm how we could take advantage of this unfortunate event,” said Sarah Depenbrock, assistant professor and agronomist in the Medicine and Epidemiology department of UC Davis School of Veterinary Medicine.

Burning has played a role in agricultural processes for many years, but wildfires in California are creating a new fire landscape that interests researchers like Depenbrock. “The problem, now, is that these big wildfires probably interact with agricultural land differently than routine prescribed burns,” she said.

Large, older plants on lands that have not recently burned may contain high concentrations of metals, sequestered over years of growth. Mercury is an example of a potentially dangerous metal that can be sequestered in living things over time. These metals may be distributed in ash after the vegetation burns so the scientists examined lambs that had grazed on Hopland REC's recently burned pastures, during the first plant regrowth.

The researchers compared meat from lambs that grazed on regrown pastures in 2019, after the River Fire, to frozen meat samples that were collected the year before the fire. Lead, mercury, arsenic, molybdenum, cadmium, beryllium, cobalt and nickel were not detected in any animal samples. There were, however, a few (3 out of 26) samples that tested positive for the non-essential (potentially toxic heavy metals) chromium and thallium in the group grazing after the fire.

Due to the small number of samples testing positive, researchers could not determine statistically if this contamination was associated with grazing the burn regrowth. The concentrations of chromium and thallium found may or may not be potentially toxic, depending on the specific forms and how much meat a person consumes.

Another aspect of the study included testing lambs' wool to determine if it is a good method of judging the mineral content of its meat. “In general, we learned that it wasn't well-correlated with most meat metal content of interest, which is worth knowing. However, because we did not identify many of the non-essential metals of particular toxologic concern, such as lead or mercury, in any animal samples we could not determine if testing wool would be useful for those metals, as they are in other species,” said Depenbrock. She also notes that the wool from animals whose meat tested positive for chromium and thallium, did not test positive for these metals in their wool.

As the challenges in managing wildfires persist, so does the risk of contamination of food products stemming from grazing livestock.

“We didn't get striking evidence that tells us, when there's a fire, it means everything is contaminated with heavy metals,” said Depenbrock. “But it does raise the question that maybe we should be doing a little bit of surveillance to see if this is spurious or common. And we should be finding a way to screen grazing herds.”

Recommendations to manage copper concerns

“It's a very small study, but it was quite interesting to find that copper was actually lower in the postfire grazing group, which makes me wonder,” Depenbrock said.

Diseases associated with copper deficiency are a major concern in sheep. For example, congenital swayback can result in stillbirth or an animal's inability to stand on its own due to incurable changes to the spinal cord. Other adverse effects include reduced growth rate, anemia, wool defects and fiber depigmentation, and osteoporosis with higher risk of spontaneous fractures. Copper excess can also cause serious and sometimes fatal disease.

Many of the forage sources, grazing areas and rangelands in California are copper deficient, while some feed sources have excess copper. Screening and monitoring livestock herds for trace minerals including copper is crucial.

To test for copper, she advises livestock owners to obtain mineral concentrations from the organs of euthanized or dead animals. Samples from the liver and kidney are the most valuable organs to identify a potential problem in the herd. UC Davis Veterinary Medicine's California Animal Health and Food Safety (CAHFS) labs do this testing routinely.

Second, monitor and record mineral supplementation and, third, maintain updated health records to make informed decisions regarding supplementation based on a herd or flock's known problems. For example, if a producer is not accustomed to supplementing copper, Depenbrock highly recommends working with a veterinarian to start out (as there are numerous copper supplement products of varying concentration on the market), to determine a testing or screening plan, and review health records for problems potentially associated with copper.

To read the full text of the study, visit https://calag.ucanr.edu/Archive/?article=ca.2022a0016.

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