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Division of Agriculture and Natural Resources

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Keeping cows cool with less water and energy

Jersey Cow

Innovative cooling technologies tested on dairy cows at UC Davis are addressing the long-standing challenge of keeping dairy cows cool in heat-stressed California.

Standard livestock cooling methods, such as fans and sprinkling cows with water, require significant amounts of electricity and water. The new technologies, being tested at UC Davis by the Western Cooling Efficiency Center and the Department of Animal Science, are designed to reduce water by up to 86 percent and electricity by up to 38 percent over conventional methods.

Milk production and heat stress

Milk is the most valued agricultural commodity in California, with $9.4 billion in retail sales in 2014. Roughly one in every five dairy cows in the nation lives in California. In addition to disturbing the cow, heat stress is a major cause of diminished milk production in dairy cows, with annual losses directly related to heat stress exceeding $800 million.

“The process of rumination, where cows ferment their food, produces a lot of heat, as does milk production itself,” said Cassandra Tucker, a professor in the Department of Animal Science who focuses on dairy cattle welfare. “When the outside temperatures also rise, it's a challenge for the animal in how she's going to try to keep cool. This project is trying to reduce the energy and water use associated with that to help both the cows and the dairy producers.”

How it works

The technologies involve two approaches. The first is conduction cooling, where the bedding area is cooled using heat exchange mats placed where cows lie down. To reduce energy consumption, water flowing through the mats is cooled through a novel evaporative chiller called a Sub-Wet Bulb Evaporative Chiller.

The second approach is targeted convection cooling, which uses fabric ducting to direct cool air onto the cows while they lie down and when they eat. The air is cooled using a high-efficiency direct evaporative cooler.

Cow-Cooling-Approaches infographic ChantelOah UCD

"This is an exciting research opportunity for UC Davis to combine our expertise in engineering with our expertise in animal science,” said Theresa Pistochini, senior engineer at the Western Cooling Efficiency Center. “There is significant potential to apply existing technologies in a novel way to reduce both energy and water used to cool dairy cows. Through this project we aim to design, test and demonstrate an efficient alternative.”

The project is part of a four-year, $1 million grant from the California Energy Commission to help improve water and energy efficiency in California's dairy industry. The data being collected now will help determine which technology the team should use to pilot at a commercial dairy in a future phase of the project.

Cows being cooled by a fan.

For more information, contact:

Kat Kerlin, UC Davis News and Media Relations, 530-752-7704, 530-750-9195 (cell), kekerlin@ucdavis.edu

Paul Fortunato, UC Davis Western Cooling Efficiency Center, 530-752-0280, 916-412-3022, pfortunato@ucdavis.edu

Posted on Tuesday, September 19, 2017 at 10:41 AM
  • Author: Kat Kerlin

Decreasing forest density will reduce fire risk, build climate resilience

“Actions to arrest the decline in forest health will take place far from urban centers,” said Van Butsic, a coauthor of the report.

California needs to increase the pace and scale of efforts to improve the health of its headwater forests — the source of two-thirds of the state's surface water supply. Management techniques including prescribed fire, managed wildfire and mechanical thinning can help rebuild resilience in these forests and prepare them for a challenging future.

These are among the key findings of a report released today by the PPIC Water Policy Center.

Decades of fire suppression have increased the density of trees and other fuels in headwater forests to uncharacteristically high levels and resulted in massive tree die-offs and large, severe wildfires. Improving forest health will require reducing the density of small trees and fuels on a massive scale.

This will require changes in the regulation, administration, and management of forests. Many of the recommended reforms in forest management can take place at low or no cost. But implementing them will require vision, determined leadership by state and federal officials, and the backing of an informed public.

“Actions to arrest the decline in forest health will take place far from urban centers,” said Van Butsic, a coauthor of the report and a UC Cooperative Extension specialist in the Department of Environmental Science, Policy and Management at UC Berkeley. “But all Californians will benefit through continued supplies of high-quality water, natural environments, forest products and recreational landscapes.”

Changing the way forestry work is funded — and in some cases securing new funding — will also be needed to help expedite forest improvements. The authors suggest reforms that will enable the private sector and government agencies to use existing tools and funding opportunities more effectively and collaborate more easily on larger-scale management projects. One key recommendation is to find opportunities to combine revenue-generating timber harvesting with other management work to help offset the costs of efforts to improve forest health.

“Making forest health a top land management priority for public and private lands would be a critical first step in reversing the degraded condition of the state's headwater forests,” said report coauthor Henry McCann, a research associate with the PPIC Water Policy Center.

The report, Improving the Health of California's Headwater Forests, was supported with funding from the S. D. Bechtel, Jr. Foundation and the US Environmental Protection Agency. In addition to Butsic and McCann, the coauthors are Jeffrey Mount and Brian Gray, both senior fellows at the PPIC Water Policy Center; Jodi Axelson, a UC Cooperative Extension specialist at UC Berkeley; Yufang Jin, an assistant professor in the Department of Land, Air, and Water Resources at UC Davis; Scott Stephens, professor of fire science and co-director of the Center for Forestry and Center for Fire Research and Outreach at UC Berkeley; and William Stewart, a UC Cooperative Extension specialist and co-director of the Center for Forestry and Center for Fire Research and Outreach at the UC Berkeley.

Posted on Monday, September 18, 2017 at 9:05 PM

UC ANR is a natural partner to help bridge California’s digital divide

Even as the digital revolution has changed the world, there are thousands of California residents in rural areas that do not have an internet connection adequate for engaging in modern technology.

With offices in all California counties and several research centers located in remote locations, UC Agriculture and Natural Resources Vice President Glenda Humiston and UC ANR Chief Innovation Officer Gabe Youtsey believe UC ANR is in a position to forge partnerships with government, industry, and other academic organizations to connect rural Californians with high-speed internet.

Youtsey testified at a rural broadband informational hearing in Sacramento on Aug. 28 held by the Assembly Select Committee on Economic Development and Investment in Rural California, chaired by Rep. Anna Caballero (D-Salinas), and the Communications and Conveyance Committee, chaired by Rep. Miguel Santiago (D-Los Angeles.)

UC ANR Chief Innovation Officer Gabe Youtsey, far left, testifies before Rep. Anna Caballero (blue jacket), staffer Peter Ansel, and Rep. Monique Limón. (Photo: Anna Megaro)

In his testimony, Youtsey characterized the presence of UC ANR in California for the lawmakers.

“We are a network, not a place,” he said. “We have more than 1,500 very applied academics; I call them academics with muddy boots because our job is really to turn science into on-the-ground solutions.”

While it is potentially expensive to bring broadband internet connectivity to every resident of California – from the far reaches of Modoc County in the north to remote desert communities near the Mexican border in the south – those communities' lack of high-speed internet is also exacting a high medical, social, and educational cost.

“High-speed connectivity is needed in rural communities not just for entertainment,” Youtsey said. “It's about online education, medical care, banking and businesses. Digital inclusion is an issue of economic justice.”

Youtsey likens the spread of broadband internet to a successful initiative in the 1930s to promote rural electrification in the U.S. The program was managed by the U.S. Rural Electrification Administration, one of the agencies created under the New Deal, President Franklin Roosevelt's sweeping legislation that helped lift the United States out of the Great Depression.

The government's role in “internetification” could be an investment in infrastructure, Youtsey said.

“It is very expensive to bring wired internet connectivity to places where it has never been before,” Youtsey said at the hearing.

At one UC ANR location, the UC Sierra Foothills Research and Extension Center, laying a wired connection was cost prohibitive.

“The internet provider had to beam a signal from Marysville, up to the top of the Sutter Buttes, and then beam 26 miles across the valley to our location. That was about a $150,000 one-time set-up cost. That's just not realistic in many cases,” he said.

Youtsey said UC ANR would like to leverage its remote locations as launch points for public-private partnerships for rural broadband, a plan that dovetails an initiative now being considered by state legislators.

Assembly Member Eduardo Garcia (D-Coachella) has introduced AB 1665, known as the Internet for All Now bill, which aims to ensure social and economic equity for all Californians in the digital age. This bill would approve funding by Dec, 31, 2022, for infrastructure projects that would provide broadband access to no less than 98 percent of California households.

“We support passage of the bill, but we're not going to stand still,” Youtsey said.

A drone flying over sorghum research plots at the Kearney REC collects information on plant height, leaf area and biomass. Working with large data sets, such as this one, requires high-speed internet.

Already, UC ANR is creating partnerships with rural communities to provide shared internet connectivity. One project underway is located at the UC Kearney Agricultural Research and Extension Centernear Parlier, a 15,000-resident community in rural southeast Fresno County that has one of the state's highest percentages of Latinos. After connecting the center with fast one-gigabit speeds, UC ANR is planning to outfit all 330 acres with outdoor wireless coverage to support research and innovation. The next step will be to pilot a public-private partnership with the local community to work with the center and a vendor to share costs and make affordable broadband upgrades for both the residents in the community and UC researchers.

Another project is located at the UC Lindcove Research and Extension Center at the eastern edge of the San Joaquin Valley near Exeter, an agricultural city of 10,000 near the Sierra Nevada foothills.

“We don't have this site lit up yet. We're working hard on beaming a signal from Visalia, 25 miles away,” Youtsey said. “Once we have it here, we're in the heart of the state's citrus region. We're surrounded by commercial citrus farmers who all struggle immensely with getting broadband. We hope to be part of the solution.”

Posted on Thursday, September 14, 2017 at 9:02 AM

$1.6M from NSF to Study Water, Land Use in Disadvantaged Communities

The National Science Foundation has awarded $1.6M to UC Davis to analyze the complex relationships between surface water and groundwater supply, agricultural land use and the economic well-being of rural, disadvantaged communities.

The project is led by principal investigator Helen Dahlke, an associate professor in the UC Davis Department of Land, Air and Water Resources. The team will develop models to help guide decision-making regarding water management and land use in the state.

Helen Dahlke in field

Helen Dahlke studies how groundwater is used and replenished in California. (Tiffany Kocis/UC Davis)

While the newly funded project focuses on the Tulare Basin in California's Central Valley, it is expected to provide new insights for other regions of the United States facing similar issues involving economic and water security.

The broader impacts of the project focus on helping local disadvantaged communities participate in the governance of water resources. This includes forming “water schools” and engaging K-12 students from under-represented groups in science and policy issues.

The project will also provide interdisciplinary research education and training for graduate and undergraduate students, who will be involved in all aspects of the research and community engagement activities.

The project is supported by the NSF Dynamics of Coupled Natural and Human (CNH) Systems Program. The award is one of nine the program awarded across the nation this week, totaling $13 million.

“These awards demonstrate the importance of understanding the connectedness of nature and society in studying the effects of environmental change and socioeconomic stress,” said CNH program director Liz Blood of NSF.

Co-PIs on the research team include Jon Herman in the UC Davis Department of Civil and Environmental Engineering; Anne Visser and Clare Gupta in the UC Davis Department of Human Ecology; Rebecca Teasley from the University of Minnesota, Duluth; and Laurel Firestone from the nonprofit Community Water Center.

More information

Flooding Farms in the Rain to Restore Groundwater

Kat Kerlin writes about the environment for UC Davis Strategic Communications. Follow her at @UCDavis_Kerlin.

Posted on Thursday, September 14, 2017 at 8:27 AM
  • Author: Kat Kerlin

Partnering with produce providers

What's one way to combat food waste, save money, and expand food knowledge? Ask a UC Master Food Preserver.

Or rather, have a group of dedicated volunteers do a hands-on demo at a CSA pick-up location. Tanaka Farms, located in Orange County, did just that. The farm's Community Supported Agriculture program delivers more than 1,600 produce boxes a month to a subscriber base that is highly motivated to prepare and cook food. Educating their customers is a mission of Tanaka Farms CSA as well as a tenet of the UC Master Food Preserver Program.

A sample Community Supported Agriculture (CSA) box. Photo Credit: Tanaka Farms
Working with Patty Nagatoshi, Tanaka Farms CSA program coordinator, UC Master Food Preserver volunteers have already held two workshops for CSA customers. These classes were tailored to preserving the contents of the CSA box, since CSA members often struggle to find a use for every item they receive. Volunteers handed out a list of suggested recipes as a reference after the workshops. These classes are helping customers to maximize their bounty while also cutting down on wasted food. 
 
UC Master Food Preserver Volunteers demonstrate ways to use CSA produce. Photo credit: UC Master Food Preserver Program of Orange County

Additionally, Master Food Preserver volunteers held demonstrations at the farm's Strawberry and Corn Festivals. There they demonstrated dehydrating strawberry fruit leather, making strawberry freezer jam, canning corn relish and making corn broth.

Crushing strawberries for strawberry jam. Photo credit: UC Master Food Preserver Program of Orange County

These off-site demos are a prime example of bringing safe, reputable information directly to the public. Preserve today, relish tomorrow!

Posted on Wednesday, September 13, 2017 at 8:56 AM

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