Innovative cooling technologies tested on dairy cows at the University of California-Davis (UC-Davis) are addressing the long-standing challenge of keeping dairy cows cool in heat-stressed areas like California and other regions.
Standard livestock cooling methods, such as using fans and sprinkling cows with water, require significant amounts of electricity and water. The new technologies being tested at UC-Davis by the department of animal science and the Western Cooling Efficiency Center are designed to reduce water use by as much as 86% and electricity by as much as 38% versus conventional methods.
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 UC-Davis 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 by placing heat-exchange mats where the 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 the cool air onto the cows while they lie down and when they eat. The air is cooled using a high-efficiency direct evaporative cooler.
“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 in a pilot project at a commercial dairy in a future phase of the project.